Initial commit

2024-02-14 00:01:58 +02:00 · 2024-02-14 00:01:58 +02:00 · 5c65209f2b
commit 5c65209f2b
80 changed files with 3240 additions and 0 deletions
--- a/.classpath
+++ b/.classpath
@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
+	<classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
+	<classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.DEPENDENCIES"/>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="src" path="gen"/>
+	<classpathentry kind="output" path="bin/classes"/>
+</classpath>
--- a/.project
+++ b/.project
@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Journal</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>com.android.ide.eclipse.adt.ApkBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>com.android.ide.eclipse.adt.AndroidNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.university.journal"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="8"
+        android:targetSdkVersion="19" />
+    
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
+    
+    <uses-permission android:name="android.permission.USE_CREDENTIALS" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
+
+    <uses-permission android:name="android.permission.READ_SYNC_STATS" />
+    <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
+    <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name="com.university.journal.MainActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        
+        <provider android:authorities="com.university.journal.dbprovider"
+                  android:name="com.university.journal.db.DbContentProvider"
+                  android:label="@string/app_name"
+                  android:exported="false" />
+        
+        <service
+            android:name="com.university.journal.accounts.AccountService"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.accounts.AccountAuthenticator" />
+            </intent-filter>
+            <meta-data
+                android:name="android.accounts.AccountAuthenticator"
+                android:resource="@xml/authenticator" />
+        </service>
+    </application>
+
+</manifest>
--- a/proguard-project.txt
+++ b/proguard-project.txt
@ -0,0 +1,20 @@
+# To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
--- a/project.properties
+++ b/project.properties
@ -0,0 +1,16 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-19
+android.library.reference.1=..\\TableFixHeaders
+android.library.reference.2=../android-support-v7-appcompat
--- a/res/drawable-hdpi/drawer_shadow.9.png
+++ b/res/drawable-hdpi/drawer_shadow.9.png
--- a/res/drawable-hdpi/ic_action_export.png
+++ b/res/drawable-hdpi/ic_action_export.png
--- a/res/drawable-hdpi/ic_action_new.png
+++ b/res/drawable-hdpi/ic_action_new.png
--- a/res/drawable-hdpi/ic_drawer.png
+++ b/res/drawable-hdpi/ic_drawer.png
--- a/res/drawable-hdpi/ic_launcher.png
+++ b/res/drawable-hdpi/ic_launcher.png
--- a/res/drawable-mdpi/drawer_shadow.9.png
+++ b/res/drawable-mdpi/drawer_shadow.9.png
--- a/res/drawable-mdpi/ic_action_export.png
+++ b/res/drawable-mdpi/ic_action_export.png
--- a/res/drawable-mdpi/ic_action_new.png
+++ b/res/drawable-mdpi/ic_action_new.png
--- a/res/drawable-mdpi/ic_drawer.png
+++ b/res/drawable-mdpi/ic_drawer.png
--- a/res/drawable-mdpi/ic_launcher.png
+++ b/res/drawable-mdpi/ic_launcher.png
--- a/res/drawable-xhdpi/drawer_shadow.9.png
+++ b/res/drawable-xhdpi/drawer_shadow.9.png
--- a/res/drawable-xhdpi/ic_action_export.png
+++ b/res/drawable-xhdpi/ic_action_export.png
--- a/res/drawable-xhdpi/ic_action_new.png
+++ b/res/drawable-xhdpi/ic_action_new.png
--- a/res/drawable-xhdpi/ic_drawer.png
+++ b/res/drawable-xhdpi/ic_drawer.png
--- a/res/drawable-xhdpi/ic_launcher.png
+++ b/res/drawable-xhdpi/ic_launcher.png
--- a/res/drawable-xxhdpi/drawer_shadow.9.png
+++ b/res/drawable-xxhdpi/drawer_shadow.9.png
--- a/res/drawable-xxhdpi/ic_action_new.png
+++ b/res/drawable-xxhdpi/ic_action_new.png
--- a/res/drawable-xxhdpi/ic_drawer.png
+++ b/res/drawable-xxhdpi/ic_drawer.png
--- a/res/drawable-xxhdpi/ic_launcher.png
+++ b/res/drawable-xxhdpi/ic_launcher.png
--- a/res/drawable/ab_background.xml
+++ b/res/drawable/ab_background.xml
@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <gradient
+        android:angle="180"
+        android:endColor="@color/ab_background2"
+        android:startColor="@color/ab_background1" />
+
+</shape>
--- a/res/drawable/bg_table_header.xml
+++ b/res/drawable/bg_table_header.xml
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    
+    <solid android:color="#CFEBD2" />
+    <stroke android:width="1dp" android:color="#C4E6C7" />
+</shape>
--- a/res/drawable/bg_table_item1.xml
+++ b/res/drawable/bg_table_item1.xml
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    
+    <solid android:color="#E4F8EA" />
+    <stroke android:width="1dp" android:color="#CEF2D9" />
+</shape>
--- a/res/drawable/bg_table_item2.xml
+++ b/res/drawable/bg_table_item2.xml
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    
+    <solid android:color="#EEEEEE" />
+    <stroke android:width="1dp" android:color="#E3E3E3" />
+</shape>
--- a/res/drawable/list_selector.xml
+++ b/res/drawable/list_selector.xml
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- Pressed state. -->
+    <item android:drawable="@color/list_item_bg_pressed" android:state_pressed="true" />
+    
+    <!-- Checked state. -->
+    <item android:drawable="@color/list_item_bg_checked" android:state_pressed="false" android:state_checked="true"/>
+
+</selector>
--- a/res/layout-sw600dp-land/activity_main.xml
+++ b/res/layout-sw600dp-land/activity_main.xml
@ -0,0 +1,34 @@
+<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:background="@color/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="horizontal"
+    tools:context="com.university.journal.MainActivity" >
+
+    <!--
+         The drawer is given a fixed width in dp and extends the full height of
+         the container.
+    -->
+
+    <fragment
+        android:id="@+id/navigation_drawer"
+        android:name="com.university.journal.NavigationDrawerFragment"
+        android:layout_width="@dimen/navigation_drawer_width"
+        android:layout_height="match_parent"
+        android:layout_gravity="start" />
+    
+    
+    <!--
+         As the main content view, the view below consumes the entire
+         space available using match_parent in both dimensions.
+    -->
+
+    <FrameLayout
+        android:id="@+id/container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+
+</LinearLayout>
--- a/res/layout/activity_main.xml
+++ b/res/layout/activity_main.xml
@ -0,0 +1,39 @@
+<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->
+<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/drawer_layout"
+    android:background="@color/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="com.university.journal.MainActivity" >
+
+    <!--
+         As the main content view, the view below consumes the entire
+         space available using match_parent in both dimensions.
+    -->
+
+    <FrameLayout
+        android:id="@+id/container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <!--
+         android:layout_gravity="start" tells DrawerLayout to treat
+         this as a sliding drawer on the left side for left-to-right
+         languages and on the right side for right-to-left languages.
+         If you're not building against API 17 or higher, use
+         android:layout_gravity="left" instead.
+    -->
+    <!--
+         The drawer is given a fixed width in dp and extends the full height of
+         the container.
+    -->
+
+    <fragment
+        android:id="@+id/navigation_drawer"
+        android:name="com.university.journal.NavigationDrawerFragment"
+        android:layout_width="@dimen/navigation_drawer_width"
+        android:layout_height="match_parent"
+        android:layout_gravity="start" />
+
+</android.support.v4.widget.DrawerLayout>
--- a/res/layout/dialog_add_criteria.xml
+++ b/res/layout/dialog_add_criteria.xml
@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="10"
+        android:maxLength="255"
+        android:hint="@string/name" >
+
+        <requestFocus />
+    </EditText>
+
+    <EditText
+        android:id="@+id/date"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="date"
+        android:ems="10"
+        android:maxLength="12"
+        android:hint="@string/date" />
+    
+    <Spinner
+        android:id="@+id/subjectSpinner"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+</LinearLayout>
--- a/res/layout/dialog_add_group.xml
+++ b/res/layout/dialog_add_group.xml
@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="10"
+        android:maxLength="16"
+        android:hint="@string/name" >
+
+        <requestFocus />
+    </EditText>
+
+</LinearLayout>
--- a/res/layout/dialog_add_mark.xml
+++ b/res/layout/dialog_add_mark.xml
@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/mark"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="5"
+        android:maxLength="4"
+        android:hint="@string/mark" >
+
+        <requestFocus />
+    </EditText>
+
+</LinearLayout>
--- a/res/layout/dialog_add_student.xml
+++ b/res/layout/dialog_add_student.xml
@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/lastname"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="textPersonName"
+        android:ems="10"
+        android:maxLength="255"
+        android:hint="@string/lastname" >
+
+        <requestFocus />
+    </EditText>
+
+    <EditText
+        android:id="@+id/firstname"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="textPersonName"
+        android:ems="10"
+        android:maxLength="255"
+        android:hint="@string/firstname" />
+    
+    <EditText
+        android:id="@+id/middlename"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="textPersonName"
+        android:ems="10"
+        android:maxLength="255"
+        android:hint="@string/middlename" />
+    
+    <Spinner
+        android:id="@+id/groupSpinner"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+</LinearLayout>
--- a/res/layout/dialog_add_subject.xml
+++ b/res/layout/dialog_add_subject.xml
@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <EditText
+        android:id="@+id/name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="10"
+        android:maxLength="255"
+        android:hint="@string/name" >
+
+        <requestFocus />
+    </EditText>
+
+    <EditText
+        android:id="@+id/shortName"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:inputType="text"
+        android:ems="4"
+        android:maxLength="12"
+        android:hint="@string/short_name" />
+
+</LinearLayout>
--- a/res/layout/fragment_main.xml
+++ b/res/layout/fragment_main.xml
@ -0,0 +1,29 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+        
+        <Spinner
+	        android:id="@+id/subjectSpinner"
+	        android:layout_width="0dp"
+	        android:layout_height="wrap_content"
+	        android:layout_weight="1" />
+	    
+	    <Spinner
+	        android:id="@+id/groupSpinner"
+	        android:layout_width="0dp"
+	        android:layout_height="wrap_content"
+	        android:layout_weight="1" />
+    </LinearLayout>
+
+    <com.inqbarna.tablefixheaders.TableFixHeaders
+        android:id="@+id/table"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>
--- a/res/layout/fragment_navigation_drawer.xml
+++ b/res/layout/fragment_navigation_drawer.xml
@ -0,0 +1,9 @@
+<ListView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#C8E2F3E4"
+    android:choiceMode="singleChoice"
+    android:divider="@android:color/transparent"
+    android:dividerHeight="0dp"
+    tools:context="com.university.journal.NavigationDrawerFragment" />
--- a/res/layout/fragment_table.xml
+++ b/res/layout/fragment_table.xml
@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+
+    <HorizontalScrollView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" >
+
+        <TableLayout
+            android:id="@+id/table"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:stretchColumns="*">
+        </TableLayout>
+    </HorizontalScrollView>
+</ScrollView>
--- a/res/layout/item_nav_drawer.xml
+++ b/res/layout/item_nav_drawer.xml
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
+    style="@style/navItemStyle"
+    android:id="@android:id/text1"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:gravity="center_vertical"
+    android:checkMark="@null"
+    android:background="@drawable/list_selector"
+/>
--- a/res/menu/add_item.xml
+++ b/res/menu/add_item.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto" >
+
+    <item
+        android:id="@+id/action_add"
+        android:title="@string/action_add"
+        android:icon="@drawable/ic_action_new"
+        app:showAsAction="always|withText"/>
+
+</menu>
--- a/res/menu/item_context.xml
+++ b/res/menu/item_context.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto" >
+
+    <item
+        android:id="@+id/action_delete"
+        android:title="@string/delete"
+        android:icon="@android:drawable/ic_menu_delete"
+        app:showAsAction="always|withText" />
+
+</menu>
--- a/res/menu/main.xml
+++ b/res/menu/main.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto" >
+
+    <item
+        android:id="@+id/action_export"
+        android:title="@string/action_export"
+        android:icon="@drawable/ic_action_export"
+        app:showAsAction="always|withText"/>
+
+</menu>
--- a/res/values-v11/styles.xml
+++ b/res/values-v11/styles.xml
@ -0,0 +1,19 @@
+<resources>
+
+    <!--
+        Base application theme for API 11+. This theme completely replaces
+        AppBaseTheme from res/values/styles.xml on API 11+ devices.
+    -->
+    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
+        <item name="android:actionBarStyle">@style/MintActionBar</item>
+        <item name="actionBarStyle">@style/MintActionBar</item>
+    </style>
+
+    <style name="navItemStyle">
+        <item name="android:minHeight">?android:attr/listPreferredItemHeightSmall</item>
+        <item name="android:textAppearance">?android:attr/textAppearanceListItemSmall</item>
+        <item name="android:paddingLeft">?android:attr/listPreferredItemPaddingLeft</item>
+        <item name="android:paddingRight">?android:attr/listPreferredItemPaddingRight</item>
+    </style>
+    
+</resources>
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="background">#E2F3E4</color>
+    <color name="ab_background1">#51BB5B</color>
+    <color name="ab_background2">#3FA348</color>
+    
+    <color name="list_item_bg_pressed">#C4E6C8</color>
+    <color name="list_item_bg_checked">#89D191</color>
+</resources>
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@ -0,0 +1,9 @@
+<resources>
+
+    <!--
+         Per the design guidelines, navigation drawers should be between 240dp and 320dp:
+         https://developer.android.com/design/patterns/navigation-drawer.html
+    -->
+    <dimen name="navigation_drawer_width">240dp</dimen>
+    
+</resources>
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">Журнал преподавателя</string>
+    <string name="navigation_drawer_open">Open navigation drawer</string>
+    <string name="navigation_drawer_close">Close navigation drawer</string>
+    <string name="action_example">Действие</string>
+    <string name="action_settings">Настройки</string>
+    <string name="action_add">Добавить</string>
+    <string name="action_export">Экспорт</string>
+    
+    <string name="one_account_allowed">Разрешён только один аккаунт</string>
+    <string name="please_wait">Пожалуйста, подождите…</string>
+    <string name="no_data">Нет данных для отображения</string>
+    <string name="validate_error">Ошибка.\nПроверьте правильность ввода</string>
+    <string name="saved">Сохранено</string>
+    
+    <string name="name">Название</string>
+    <string name="short_name">Сокращение</string>
+    <string name="lastname">Фамилия</string>
+    <string name="firstname">Имя</string>
+    <string name="middlename">Отчество</string>
+    <string name="date">Дата (yyyy-MM-dd)</string>
+    <string name="mark">Оценка или текст</string>
+    
+    <string name="add">Добавить</string>
+    <string name="delete">Удалить</string>
+
+    <string-array name="nav_sections">
+        <item>Журнал</item>
+        <item>Дисциплины</item>
+        <item>Критерии оценки</item>
+        <item>Группы</item>
+        <item>Студенты</item>
+    </string-array>
+</resources>
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@ -0,0 +1,27 @@
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!--
+        Base application theme, dependent on API level. This theme is replaced
+        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
+    -->
+    <style name="AppBaseTheme" parent="Theme.AppCompat.Light">
+        <item name="actionBarStyle">@style/MintActionBar</item>
+    </style>
+
+    <!-- Application theme. -->
+    <style name="AppTheme" parent="AppBaseTheme">
+        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
+    </style>
+
+    <style name="MintActionBar" parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
+        <item name="android:background">@drawable/ab_background</item>
+        <item name="background">@drawable/ab_background</item>
+    </style>
+    
+    <style name="navItemStyle">
+        <item name="android:minHeight">?android:attr/listPreferredItemHeight</item>
+        <item name="android:textAppearance">?android:attr/textAppearanceMedium</item>
+        <item name="android:paddingLeft">6dip</item>
+    </style>
+    
+</resources>
--- a/res/xml/authenticator.xml
+++ b/res/xml/authenticator.xml
@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accountType="com.university.journal"
+    android:icon="@drawable/ic_launcher"
+    android:label="@string/app_name"
+    android:smallIcon="@drawable/ic_launcher" />
--- a/res/xml/db_sync.xml
+++ b/res/xml/db_sync.xml
@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<sync-adapter xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accountType="com.university.journal"
+    android:allowParallelSyncs="false"
+    android:contentAuthority="com.university.journal.dbprovider"
+    android:isAlwaysSyncable="false"
+    android:supportsUploading="true"
+    android:userVisible="true" />
--- a/src/com/university/journal/EmptyTableAdapter.java
+++ b/src/com/university/journal/EmptyTableAdapter.java
@ -0,0 +1,66 @@
+package com.university.journal;
+
+import android.content.Context;
+import android.database.DataSetObserver;
+import android.view.View;
+import android.view.ViewGroup;
+import com.inqbarna.tablefixheaders.adapters.TableAdapter;
+
+/**
+ * Empty adapter for marks table.
+ */
+public final class EmptyTableAdapter implements TableAdapter {
+    
+    private final Context mContext;
+    
+    public EmptyTableAdapter(Context context) {
+        this.mContext = context;
+    }
+
+    @Override
+    public void registerDataSetObserver(DataSetObserver observer) {
+    }
+
+    @Override
+    public void unregisterDataSetObserver(DataSetObserver observer) {
+    }
+
+    @Override
+    public int getRowCount() {
+        return 1;
+    }
+
+    @Override
+    public int getColumnCount() {
+        return 1;
+    }
+
+    @Override
+    public View getView(int row, int column, View convertView, ViewGroup parent) {
+        if (convertView == null) {
+            convertView = new View(mContext);
+        }
+        return convertView;
+    }
+
+    @Override
+    public int getWidth(int column) {
+        return 200;
+    }
+
+    @Override
+    public int getHeight(int row) {
+        return 100;
+    }
+
+    @Override
+    public int getItemViewType(int row, int column) {
+        return 0;
+    }
+
+    @Override
+    public int getViewTypeCount() {
+        return 1;
+    }
+
+}
--- a/src/com/university/journal/MainActivity.java
+++ b/src/com/university/journal/MainActivity.java
@ -0,0 +1,104 @@
+package com.university.journal;
+
+import static com.university.journal.accounts.Authenticator.ACCOUNT_TYPE;
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.ActionBarActivity;
+import com.university.journal.accounts.Authenticator;
+import com.university.journal.fragments.CriteriaFragment;
+import com.university.journal.fragments.GroupFragment;
+import com.university.journal.fragments.MainFragment;
+import com.university.journal.fragments.StudentFragment;
+import com.university.journal.fragments.SubjectFragment;
+
+public final class MainActivity extends ActionBarActivity
+        implements NavigationDrawerFragment.NavigationDrawerCallbacks {
+
+    /**
+     * Fragment managing the behaviors, interactions and presentation of the
+     * navigation drawer.
+     */
+    private NavigationDrawerFragment mNavigationDrawerFragment;
+
+    /**
+     * Used to store the last screen title. For use in
+     * {@link #restoreActionBar()}.
+     */
+    private CharSequence mTitle;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        
+        final AccountManager accountManager = AccountManager.get(this);
+        final Account[] accounts = accountManager.getAccountsByType(ACCOUNT_TYPE);
+        if (accounts.length == 0) {
+            final String login = getString(R.string.app_name);
+            Authenticator.addAccount(login, accountManager);
+        }
+        
+        setContentView(R.layout.activity_main);
+
+        mNavigationDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager()
+                .findFragmentById(R.id.navigation_drawer);
+        mTitle = getTitle();
+
+        if (mNavigationDrawerFragment != null) {
+            // Set up the drawer.
+            mNavigationDrawerFragment.setUp(R.id.navigation_drawer,
+                    (DrawerLayout) findViewById(R.id.drawer_layout));
+        }
+    }
+
+    @Override
+    public void onNavigationDrawerItemSelected(int position) {
+        // update the main content by replacing fragments
+        Fragment frag = null;
+        
+        switch (position) {
+            case 0: // Æóðíàë
+                frag = new MainFragment();
+                break;
+            case 1: // Äèñöèïëèíû
+                frag = new SubjectFragment();
+                break;
+            case 2: // Êðèòåðèè
+                frag = new CriteriaFragment();
+                break;
+            case 3: // Ãðóïïû
+                frag = new GroupFragment();
+                break;
+            case 4: // Ñòóäåíòû
+                frag = new StudentFragment();
+                break;
+        }
+        
+        if (frag == null) return;
+        
+        onSectionAttached(position);
+        
+        FragmentManager fragmentManager = getSupportFragmentManager();
+        fragmentManager
+                .beginTransaction()
+                .replace(R.id.container, frag).commit();
+    }
+
+    private void onSectionAttached(int number) {
+        final String[] titles = getResources().getStringArray(R.array.nav_sections);
+        mTitle = titles[number];
+        restoreActionBar();
+    }
+
+    private void restoreActionBar() {
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar == null) return;
+        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
+        actionBar.setDisplayShowTitleEnabled(true);
+        actionBar.setTitle(mTitle);
+    }
+}
--- a/src/com/university/journal/MarksTableAdapter.java
+++ b/src/com/university/journal/MarksTableAdapter.java
@ -0,0 +1,117 @@
+package com.university.journal;
+
+import android.content.Context;
+import android.util.DisplayMetrics;
+import android.util.TypedValue;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+import com.inqbarna.tablefixheaders.adapters.BaseTableAdapter;
+import com.university.journal.entity.Criteria;
+import com.university.journal.entity.MarksTableItem;
+
+public final class MarksTableAdapter extends BaseTableAdapter {
+    
+    private static final int VIEW_TYPE_HEADER = 0, VIEW_TYPE_MARK = 1;
+    
+    private final Context mContext;
+    private final Criteria[] mHeaders;
+    private final MarksTableItem[] mItems;
+    private final int mColumnHeaderHeight, mRowHeaderWidth, mWidth, mHeight;
+    
+    private View.OnClickListener mMarkClickListener;
+
+    public MarksTableAdapter(Context context, Criteria[] headers, MarksTableItem[] items) {
+        mContext = context;
+        mHeaders = headers;
+        mItems = items;
+        
+        DisplayMetrics dm = context.getResources().getDisplayMetrics();
+        mRowHeaderWidth = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 125, dm));
+        mWidth = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, dm));
+        mColumnHeaderHeight = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 60, dm));
+        mHeight = Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 40, dm));
+    }
+    
+    public Criteria getHeader(int column) {
+        return mHeaders[column];
+    }
+    
+    public MarksTableItem getItem(int row) {
+        return mItems[row];
+    }
+
+    public void setMarkClickListener(View.OnClickListener markClickListener) {
+        mMarkClickListener = markClickListener;
+    }
+
+    @Override
+    public int getRowCount() {
+        return mItems.length;
+    }
+
+    @Override
+    public int getColumnCount() {
+        return mHeaders.length;
+    }
+
+    @Override
+    public View getView(int row, int column, View convertView, ViewGroup parent) {
+        switch (getItemViewType(row, column)) {
+            case VIEW_TYPE_HEADER:
+                if (convertView == null) {
+                    convertView = new TextView(mContext);
+                    convertView.setBackgroundResource(R.drawable.bg_table_header);
+                }
+                if (row == -1 && column == -1) break;
+                if (row == -1) {
+                    // Column header - Criteries
+                    ((TextView) convertView).setText(mHeaders[column].readableString());
+                    ((TextView) convertView).setGravity(Gravity.CENTER_HORIZONTAL);
+                } else {
+                    // Row header - Students
+                    ((TextView) convertView).setText(mItems[row].getStudent().readableString());
+                    ((TextView) convertView).setGravity(Gravity.CENTER_VERTICAL);
+                }
+                break;
+            case VIEW_TYPE_MARK:
+                if (convertView == null) {
+                    convertView = new Button(mContext);
+                    convertView.setOnClickListener(mMarkClickListener);
+                }
+                final Button btn = (Button) convertView;
+                btn.setText(mItems[row].getMark(column).getMark());
+                
+                final int resId = (row % 2 == 0) ?
+                        R.drawable.bg_table_item1 : R.drawable.bg_table_item2;
+                convertView.setBackgroundResource(resId);
+                break;
+        }
+        
+        return convertView;
+    }
+
+    @Override
+    public int getWidth(int column) {
+        return (column == -1) ? mRowHeaderWidth : mWidth;
+    }
+
+    @Override
+    public int getHeight(int row) {
+        return (row == -1) ? mColumnHeaderHeight : mHeight;
+    }
+
+    @Override
+    public int getItemViewType(int row, int column) {
+        if (row == -1 || column == -1) return VIEW_TYPE_HEADER;
+        return VIEW_TYPE_MARK;
+    }
+
+    @Override
+    public int getViewTypeCount() {
+        return 2;
+    }
+
+}
--- a/src/com/university/journal/NavigationDrawerFragment.java
+++ b/src/com/university/journal/NavigationDrawerFragment.java
@ -0,0 +1,230 @@
+package com.university.journal;
+
+import android.app.Activity;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v4.app.ActionBarDrawerToggle;
+import android.support.v4.app.Fragment;
+import android.support.v4.view.GravityCompat;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.ActionBarActivity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+
+/**
+ * Fragment used for managing interactions for and presentation of a navigation drawer.
+ * See the <a href="https://developer.android.com/design/patterns/navigation-drawer.html#Interaction">
+ * design guidelines</a> for a complete explanation of the behaviors implemented here.
+ */
+public final class NavigationDrawerFragment extends Fragment {
+
+    /**
+     * Remember the position of the selected item.
+     */
+    private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";
+
+    /**
+     * Per the design guidelines, you should show the drawer on launch until the user manually
+     * expands it. This shared preference tracks this.
+     */
+    private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";
+
+    /**
+     * A pointer to the current callbacks instance (the Activity).
+     */
+    private NavigationDrawerCallbacks mCallbacks;
+
+    /**
+     * Helper component that ties the action bar to the navigation drawer.
+     */
+    private ActionBarDrawerToggle mDrawerToggle;
+
+    private DrawerLayout mDrawerLayout;
+    private ListView mDrawerListView;
+    private View mFragmentContainerView;
+
+    private int mCurrentSelectedPosition = 0;
+    private boolean mFromSavedInstanceState;
+    private boolean mUserLearnedDrawer;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Read in the flag indicating whether or not the user has demonstrated awareness of the
+        // drawer. See PREF_USER_LEARNED_DRAWER for details.
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
+        mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);
+
+        if (savedInstanceState != null) {
+            mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
+            mFromSavedInstanceState = true;
+        }
+
+        // Select either the default item (0) or the last selected item.
+        selectItem(mCurrentSelectedPosition);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState) {
+        mDrawerListView = (ListView) inflater.inflate(
+                R.layout.fragment_navigation_drawer, container, false);
+        mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+                selectItem(position);
+            }
+        });
+        mDrawerListView.setAdapter(new ArrayAdapter<>(
+                getActionBar().getThemedContext(),
+                R.layout.item_nav_drawer,
+                android.R.id.text1,
+                getResources().getStringArray(R.array.nav_sections)));
+        mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
+        return mDrawerListView;
+    }
+
+    public boolean isDrawerOpen() {
+        return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
+    }
+
+    /**
+     * Users of this fragment must call this method to set up the navigation drawer interactions.
+     *
+     * @param fragmentId   The android:id of this fragment in its activity's layout.
+     * @param drawerLayout The DrawerLayout containing this fragment's UI.
+     */
+    public void setUp(int fragmentId, DrawerLayout drawerLayout) {
+        mFragmentContainerView = getActivity().findViewById(fragmentId);
+        mDrawerLayout = drawerLayout;
+        if (mDrawerLayout == null) return;
+
+        // set a custom shadow that overlays the main content when the drawer opens
+        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
+        // set up the drawer's list view with items and click listener
+
+        ActionBar actionBar = getActionBar();
+        actionBar.setDisplayHomeAsUpEnabled(true);
+        actionBar.setHomeButtonEnabled(true);
+
+        // ActionBarDrawerToggle ties together the the proper interactions
+        // between the navigation drawer and the action bar app icon.
+        
+        mDrawerToggle = new ActionBarDrawerToggle(
+                getActivity(),                    /* host Activity */
+                mDrawerLayout,                    /* DrawerLayout object */
+                R.drawable.ic_drawer,             /* nav drawer image to replace 'Up' caret */
+                R.string.navigation_drawer_open,  /* "open drawer" description for accessibility */
+                R.string.navigation_drawer_close  /* "close drawer" description for accessibility */
+        ) {
+            @Override
+            public void onDrawerClosed(View drawerView) {
+                super.onDrawerClosed(drawerView);
+                if (!isAdded()) {
+                    return;
+                }
+
+                getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
+            }
+
+            @Override
+            public void onDrawerOpened(View drawerView) {
+                super.onDrawerOpened(drawerView);
+                if (!isAdded()) {
+                    return;
+                }
+
+                if (!mUserLearnedDrawer) {
+                    // The user manually opened the drawer; store this flag to prevent auto-showing
+                    // the navigation drawer automatically in the future.
+                    mUserLearnedDrawer = true;
+                    SharedPreferences sp = PreferenceManager
+                            .getDefaultSharedPreferences(getActivity());
+                    sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).commit();
+                }
+
+                getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
+            }
+        };
+
+        // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
+        // per the navigation drawer design guidelines.
+        if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
+            mDrawerLayout.openDrawer(mFragmentContainerView);
+        }
+
+        // Defer code dependent on restoration of previous instance state.
+        mDrawerLayout.post(new Runnable() {
+            @Override
+            public void run() {
+                mDrawerToggle.syncState();
+            }
+        });
+
+        mDrawerLayout.setDrawerListener(mDrawerToggle);
+    }
+
+    private void selectItem(int position) {
+        mCurrentSelectedPosition = position;
+        if (mDrawerListView != null) {
+            mDrawerListView.setItemChecked(position, true);
+        }
+        if (mDrawerLayout != null) {
+            mDrawerLayout.closeDrawer(mFragmentContainerView);
+        }
+        if (mCallbacks != null) {
+            mCallbacks.onNavigationDrawerItemSelected(position);
+        }
+    }
+
+    @Override
+    public void onAttach(Activity activity) {
+        super.onAttach(activity);
+        try {
+            mCallbacks = (NavigationDrawerCallbacks) activity;
+        } catch (ClassCastException e) {
+            throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
+        }
+    }
+
+    @Override
+    public void onDetach() {
+        super.onDetach();
+        mCallbacks = null;
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration newConfig) {
+        super.onConfigurationChanged(newConfig);
+        // Forward the new configuration the drawer toggle component.
+        mDrawerToggle.onConfigurationChanged(newConfig);
+    }
+
+    private ActionBar getActionBar() {
+        return ((ActionBarActivity) getActivity()).getSupportActionBar();
+    }
+
+    /**
+     * Callbacks interface that all activities using this fragment must implement.
+     */
+    public static interface NavigationDrawerCallbacks {
+        /**
+         * Called when an item in the navigation drawer is selected.
+         */
+        void onNavigationDrawerItemSelected(int position);
+    }
+}
--- a/src/com/university/journal/accounts/AccountService.java
+++ b/src/com/university/journal/accounts/AccountService.java
@ -0,0 +1,20 @@
+package com.university.journal.accounts;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.IBinder;
+
+public final class AccountService extends Service {
+    
+    private Authenticator mAuthenticator;
+    
+    @Override
+    public void onCreate() {
+        mAuthenticator = new Authenticator(this);
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return mAuthenticator.getIBinder();
+    }
+}
--- a/src/com/university/journal/accounts/Authenticator.java
+++ b/src/com/university/journal/accounts/Authenticator.java
@ -0,0 +1,110 @@
+package com.university.journal.accounts;
+
+import static com.university.journal.db.DbContract.AUTHORITY;
+import com.university.journal.R;
+import android.accounts.AbstractAccountAuthenticator;
+import android.accounts.Account;
+import android.accounts.AccountAuthenticatorResponse;
+import android.accounts.AccountManager;
+import android.accounts.NetworkErrorException;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.os.Bundle;
+
+public final class Authenticator extends AbstractAccountAuthenticator {
+    
+    private static final long SYNC_PERIOD = 24 * 60 * 60;
+    
+    public static final String AUTH_TOKEN_TYPE = "FULL";
+    public static final String ACCOUNT_TYPE = "com.university.journal";
+    
+    public static void addAccount(String login, AccountManager accountManager) {
+        final Account account = new Account(login, ACCOUNT_TYPE);
+        
+        accountManager.addAccountExplicitly(account, "password", null);
+        accountManager.setAuthToken(account, AUTH_TOKEN_TYPE, "token");
+        
+        ContentResolver.setIsSyncable(account, AUTHORITY, 1);
+        ContentResolver.setSyncAutomatically(account, AUTHORITY, true);
+        ContentResolver.addPeriodicSync(account, AUTHORITY, new Bundle(), SYNC_PERIOD);
+        // Force sync
+        Bundle extras = new Bundle();
+        extras.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);
+        extras.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
+        ContentResolver.requestSync(account, AUTHORITY, extras);
+    }
+    
+    private final Context mContext;
+
+    public Authenticator(Context context) {
+        super(context);
+        this.mContext = context;
+    }
+
+    @Override
+    public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options)
+            throws NetworkErrorException {
+        AccountManager accountManager = AccountManager.get(mContext);
+        Account[] accountsByType = accountManager.getAccountsByType(accountType);
+        final Bundle bundle = new Bundle();
+        // Allow only one account
+        if (accountsByType.length > 0) {
+            bundle.putString(AccountManager.KEY_ERROR_MESSAGE, mContext.getString(R.string.one_account_allowed));
+            return bundle;
+        }
+        
+        return null;
+    }
+
+    @Override
+    public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options)
+            throws NetworkErrorException {
+        return null;
+    }
+
+    @Override
+    public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
+        return null;
+    }
+
+    @Override
+    public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options)
+            throws NetworkErrorException {
+        final Bundle bundle = new Bundle();
+        if (!authTokenType.equals(AUTH_TOKEN_TYPE)) {
+            bundle.putString(AccountManager.KEY_ERROR_MESSAGE, "Invalid authTokenType");
+            return bundle;
+        }
+        
+        final AccountManager am = AccountManager.get(mContext);
+        final String password = am.getPassword(account);
+        if (password != null) {
+            bundle.putString(AccountManager.KEY_ACCOUNT_NAME, account.name);
+            bundle.putString(AccountManager.KEY_ACCOUNT_TYPE, ACCOUNT_TYPE);
+            bundle.putString(AccountManager.KEY_AUTHTOKEN, account.name + "/" + password);
+            return bundle;
+        }
+        
+        return null;
+    }
+
+    @Override
+    public String getAuthTokenLabel(String authTokenType) {
+        if (authTokenType.equals(AUTH_TOKEN_TYPE)) {
+            return mContext.getString(R.string.app_name);
+        }
+        return null;
+    }
+
+    @Override
+    public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features)
+            throws NetworkErrorException {
+        return null;
+    }
+
+    @Override
+    public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options)
+            throws NetworkErrorException {
+        return null;
+    }
+}
--- a/src/com/university/journal/db/ContentManager.java
+++ b/src/com/university/journal/db/ContentManager.java
@ -0,0 +1,83 @@
+package com.university.journal.db;
+
+import java.util.ArrayList;
+import java.util.List;
+import android.content.ContentResolver;
+import android.database.Cursor;
+import com.university.journal.db.DbContract.Criteries;
+import com.university.journal.db.DbContract.Marks;
+import com.university.journal.db.DbContract.Students;
+import com.university.journal.entity.Criteria;
+import com.university.journal.entity.Mark;
+import com.university.journal.entity.Student;
+
+public final class ContentManager {
+    
+    public static synchronized ContentManager with(ContentResolver cr) {
+        return new ContentManager(cr);
+    }
+    
+    private final ContentResolver mResolver;
+    
+    private ContentManager(ContentResolver resolver) {
+        this.mResolver = resolver;
+    }
+
+    public List<Criteria> getCriteries(long subjectId) {
+        final String selection = Criteries.SUBJECT_ID + " = ?";
+        final String[] args = { String.valueOf(subjectId) };
+        Cursor cursor = mResolver.query(
+                Criteries.CONTENT_URI, Criteries.PROJECTION_ALL,
+                selection, args, Criteries.DATE);
+        List<Criteria> criteries = new ArrayList<>();
+        if (cursor != null) {
+            while (cursor.moveToNext()) {
+                Criteria obj = new Criteria();
+                obj.fromCursor(cursor);
+                criteries.add(obj);
+            }
+        }
+        if (cursor != null) {
+            cursor.close();
+        }
+        return criteries;
+    }
+    
+    public List<Student> getStudents(long groupId) {
+        final String selection = Students.GROUP_ID + " = ?";
+        final String[] args = { String.valueOf(groupId) };
+        Cursor cursor = mResolver.query(Students.CONTENT_URI, null,
+                selection, args, Students.LAST_NAME);
+        ArrayList<Student> students = new ArrayList<>();
+        if (cursor != null) {
+            while (cursor.moveToNext()) {
+                Student obj = new Student();
+                obj.fromCursor(cursor);
+                obj.setId( cursor.getInt(cursor.getColumnIndex(Students._ID)) );
+                students.add(obj);
+            }
+        }
+        if (cursor != null) {
+            cursor.close();
+        }
+        return students;
+    }
+    
+    public Cursor getMarksCursor(long studentId) {
+        final String sel = Marks.STUDENT_ID + " = ?";
+        final String[] args = { String.valueOf(studentId) };
+        return mResolver.query(Marks.CONTENT_URI, null, sel, args, Marks.CRITERIA_ID);
+    }
+    
+    public void insertOrUpdate(Mark mark) {
+        final String where = String.format("%s = ? AND %s = ?", Marks.CRITERIA_ID, Marks.STUDENT_ID);
+        final String[] args = {
+                String.valueOf(mark.getCriteriaId()),
+                String.valueOf(mark.getStudentId())
+        };
+        int updateCount = mResolver.update(Marks.CONTENT_URI, mark.getContentValues(), where, args); 
+        if (updateCount <= 0) {
+            mResolver.insert(Marks.CONTENT_URI, mark.getContentValues());
+        }
+    }
+}
--- a/src/com/university/journal/db/DbContentProvider.java
+++ b/src/com/university/journal/db/DbContentProvider.java
@ -0,0 +1,313 @@
+package com.university.journal.db;
+
+import static com.university.journal.db.DbContract.*;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.SQLException;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteQueryBuilder;
+import android.net.Uri;
+import android.text.TextUtils;
+
+public final class DbContentProvider extends ContentProvider {
+    
+    private static final UriMatcher URI_MATCHER = buildUriMatcher();
+    private static final int STUDENTS_LIST = 10;
+    private static final int STUDENTS_ID = 11;
+    private static final int SUBJECTS_LIST = 20;
+    private static final int SUBJECTS_ID = 21;
+    private static final int GROUPS_LIST = 30;
+    private static final int GROUPS_ID = 31;
+    private static final int CRITERIES_LIST = 40;
+    private static final int CRITERIES_ID = 41;
+    private static final int MARKS_LIST = 50;
+    private static final int MARKS_ID = 51;
+    private static final int GROUP_BY_STUDENT = 91;
+    
+    private DbOpenHelper mDbHelper;
+    
+    private static final UriMatcher buildUriMatcher() {
+        final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
+        matcher.addURI(DbContract.AUTHORITY, Students.TABLE_NAME, STUDENTS_LIST);
+        matcher.addURI(DbContract.AUTHORITY, Students.TABLE_NAME + "/#", STUDENTS_ID);
+        matcher.addURI(DbContract.AUTHORITY, Subjects.TABLE_NAME, SUBJECTS_LIST);
+        matcher.addURI(DbContract.AUTHORITY, Subjects.TABLE_NAME + "/#", SUBJECTS_ID);
+        matcher.addURI(DbContract.AUTHORITY, Groups.TABLE_NAME, GROUPS_LIST);
+        matcher.addURI(DbContract.AUTHORITY, Groups.TABLE_NAME + "/#", GROUPS_ID);
+        matcher.addURI(DbContract.AUTHORITY, Criteries.TABLE_NAME, CRITERIES_LIST);
+        matcher.addURI(DbContract.AUTHORITY, Criteries.TABLE_NAME + "/#", CRITERIES_ID);
+        matcher.addURI(DbContract.AUTHORITY, Marks.TABLE_NAME, MARKS_LIST);
+        matcher.addURI(DbContract.AUTHORITY, Marks.TABLE_NAME + "/#", MARKS_ID);
+        matcher.addURI(DbContract.AUTHORITY, "group_by_student", GROUP_BY_STUDENT);
+        return matcher;
+    }
+
+    @Override
+    public boolean onCreate() {
+        mDbHelper = new DbOpenHelper(getContext());
+        return true;
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        final int match = URI_MATCHER.match(uri);
+        switch (match) {
+            case STUDENTS_LIST:
+                return Students.CONTENT_TYPE;
+            case STUDENTS_ID:
+                return Students.CONTENT_ITEM_TYPE;
+            case SUBJECTS_LIST:
+                return Subjects.CONTENT_TYPE;
+            case SUBJECTS_ID:
+                return Subjects.CONTENT_ITEM_TYPE;
+            case GROUPS_LIST:
+                return Groups.CONTENT_TYPE;
+            case GROUPS_ID:
+                return Groups.CONTENT_ITEM_TYPE;
+            case CRITERIES_LIST:
+                return Criteries.CONTENT_TYPE;
+            case CRITERIES_ID:
+                return Criteries.CONTENT_ITEM_TYPE;
+            case MARKS_LIST:
+                return Marks.CONTENT_TYPE;
+            case MARKS_ID:
+                return Marks.CONTENT_ITEM_TYPE;
+            default:
+                throw new IllegalArgumentException("URI " + uri + " is not supported.");
+        }
+    }
+    
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        SQLiteDatabase db = mDbHelper.getReadableDatabase();
+        SQLiteQueryBuilder builder = new SQLiteQueryBuilder();
+        final int match = URI_MATCHER.match(uri);
+        switch (match) {
+            case STUDENTS_LIST:
+                builder.setTables(Students.TABLE_NAME);
+                break;
+            case STUDENTS_ID:
+                builder.setTables(Students.TABLE_NAME);
+                builder.appendWhere(Students._ID + " = " + uri.getLastPathSegment());
+                break;
+            case SUBJECTS_LIST:
+                builder.setTables(Subjects.TABLE_NAME);
+                break;
+            case SUBJECTS_ID:
+                builder.setTables(Subjects.TABLE_NAME);
+                builder.appendWhere(Subjects._ID + " = " + uri.getLastPathSegment());
+                break;
+            case GROUPS_LIST:
+                builder.setTables(Groups.TABLE_NAME);
+                break;
+            case GROUPS_ID:
+                builder.setTables(Groups.TABLE_NAME);
+                builder.appendWhere(Groups._ID + " = " + uri.getLastPathSegment());
+                break;
+            case CRITERIES_LIST:
+                builder.setTables(Criteries.TABLE_NAME);
+                break;
+            case CRITERIES_ID:
+                builder.setTables(Criteries.TABLE_NAME);
+                builder.appendWhere(Criteries._ID + " = " + uri.getLastPathSegment());
+                break;
+            case MARKS_LIST:
+                builder.setTables(Marks.TABLE_NAME);
+                break;
+            case MARKS_ID:
+                builder.setTables(Marks.TABLE_NAME);
+                builder.appendWhere(Marks._ID + " = " + uri.getLastPathSegment());
+                break;
+            case GROUP_BY_STUDENT:
+                builder.setTables(String.format(
+                        "%s INNER JOIN %s ON %s.%s = %s.%s", 
+                        Students.TABLE_NAME, Groups.TABLE_NAME,
+                        Students.TABLE_NAME, Students.GROUP_ID,
+                        Groups.TABLE_NAME, Groups._ID));
+                projection = new String[] {
+                        Groups.NAME, Students.GROUP_ID
+                };
+                break;
+            default:
+                throw new IllegalArgumentException("URI " + uri + " is not supported.");
+        }
+        return builder.query(db, projection, selection, selectionArgs, null, null, sortOrder);
+    }
+    
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        SQLiteDatabase db = mDbHelper.getWritableDatabase();
+        final int match = URI_MATCHER.match(uri);
+        switch(match){
+            case STUDENTS_LIST:
+                long id = db.insert(Students.TABLE_NAME, null, values);
+                return getInsertedUri(id, uri);
+            case SUBJECTS_LIST:
+                id = db.insert(Subjects.TABLE_NAME, null, values);
+                return getInsertedUri(id, uri);
+            case GROUPS_LIST:
+                id = db.insert(Groups.TABLE_NAME, null, values);
+                return getInsertedUri(id, uri);
+            case CRITERIES_LIST:
+                id = db.insert(Criteries.TABLE_NAME, null, values);
+                return getInsertedUri(id, uri);
+            case MARKS_LIST:
+                id = db.insert(Marks.TABLE_NAME, null, values);
+                return getInsertedUri(id, uri);
+            default:
+                throw new IllegalArgumentException("URI " + uri + " is not supported.");
+        }
+    }
+    
+    private Uri getInsertedUri(long id, Uri uri) {
+        if (id <= 0) throw new SQLException("Problem while inserting into uri: " + uri);
+        Uri itemUri = ContentUris.withAppendedId(uri, id);
+        getContext().getContentResolver().notifyChange(itemUri, null);
+        return itemUri;
+   }
+    
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        SQLiteDatabase db = mDbHelper.getWritableDatabase();
+        int updateCount = 0;
+        final int match = URI_MATCHER.match(uri);
+        switch (match) {
+            case STUDENTS_LIST:
+                updateCount = db.update(Students.TABLE_NAME, values, selection, selectionArgs);
+                break;
+            case STUDENTS_ID:
+                String where = Students._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                updateCount = db.update(Students.TABLE_NAME, values, where, selectionArgs);
+                break;
+                
+            case SUBJECTS_LIST:
+                updateCount = db.update(Subjects.TABLE_NAME, values, selection, selectionArgs);
+                break;
+            case SUBJECTS_ID:
+                where = Subjects._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                updateCount = db.update(Subjects.TABLE_NAME, values, where, selectionArgs);
+                break;
+                
+            case GROUPS_LIST:
+                updateCount = db.update(Groups.TABLE_NAME, values, selection, selectionArgs);
+                break;
+            case GROUPS_ID:
+                where = Groups._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                updateCount = db.update(Groups.TABLE_NAME, values, where, selectionArgs);
+                break;
+                
+            case CRITERIES_LIST:
+                updateCount = db.update(Criteries.TABLE_NAME, values, selection, selectionArgs);
+                break;
+            case CRITERIES_ID:
+                where = Criteries._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                updateCount = db.update(Criteries.TABLE_NAME, values, where, selectionArgs);
+                break;
+                
+            case MARKS_LIST:
+                updateCount = db.update(Marks.TABLE_NAME, values, selection, selectionArgs);
+                break;
+            case MARKS_ID:
+                where = Marks._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                updateCount = db.update(Marks.TABLE_NAME, values, where, selectionArgs);
+                break;
+                
+            default:
+                throw new IllegalArgumentException("URI " + uri + " is not supported.");
+        }
+        if (updateCount > 0) {
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return updateCount;
+    }
+    
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        SQLiteDatabase db = mDbHelper.getWritableDatabase();
+        int deleteCount = 0;
+        final int match = URI_MATCHER.match(uri);
+        switch (match) {
+            case STUDENTS_LIST:
+                deleteCount = db.delete(Students.TABLE_NAME, selection, selectionArgs);
+                break;
+            case STUDENTS_ID:
+                String where = Students._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                deleteCount = db.delete(Students.TABLE_NAME, where, selectionArgs);
+                break;
+                
+            case SUBJECTS_LIST:
+                deleteCount = db.delete(Subjects.TABLE_NAME, selection, selectionArgs);
+                break;
+            case SUBJECTS_ID:
+                where = Subjects._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                deleteCount = db.delete(Subjects.TABLE_NAME, where, selectionArgs);
+                break;
+                
+            case GROUPS_LIST:
+                deleteCount = db.delete(Groups.TABLE_NAME, selection, selectionArgs);
+                break;
+            case GROUPS_ID:
+                where = Groups._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                deleteCount = db.delete(Groups.TABLE_NAME, where, selectionArgs);
+                break;
+                
+            case CRITERIES_LIST:
+                deleteCount = db.delete(Criteries.TABLE_NAME, selection, selectionArgs);
+                break;
+            case CRITERIES_ID:
+                where = Criteries._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                deleteCount = db.delete(Criteries.TABLE_NAME, where, selectionArgs);
+                break;
+                
+            case MARKS_LIST:
+                deleteCount = db.delete(Marks.TABLE_NAME, selection, selectionArgs);
+                break;
+            case MARKS_ID:
+                where = Marks._ID + " = " + uri.getLastPathSegment();
+                if (!TextUtils.isEmpty(selection)) {
+                    where += " AND " + selection;
+                }
+                deleteCount = db.delete(Marks.TABLE_NAME, where, selectionArgs);
+                break;
+                
+            default:
+                throw new IllegalArgumentException("URI " + uri + " is not supported.");
+        }
+        if (deleteCount > 0) {
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return deleteCount;
+    }
+
+}
+
--- a/src/com/university/journal/db/DbContract.java
+++ b/src/com/university/journal/db/DbContract.java
@ -0,0 +1,103 @@
+package com.university.journal.db;
+
+import android.content.ContentResolver;
+import android.net.Uri;
+import android.provider.BaseColumns;
+
+public final class DbContract {
+
+    public static final String AUTHORITY = "com.university.journal.dbprovider";
+    
+    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY);
+    
+    public static final class Students implements BaseColumns {
+        
+        public static final String TABLE_NAME = "students";
+        
+        public static final Uri CONTENT_URI =  Uri.withAppendedPath(DbContract.CONTENT_URI, TABLE_NAME);
+        
+        public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String LAST_NAME = "lastname";
+        
+        public static final String FIRST_NAME = "firstname";
+        
+        public static final String MIDDLE_NAME = "midname";
+        
+        public static final String GROUP_ID = "group_id";
+        
+        public static final String[] PROJECTION_ALL = {_ID, LAST_NAME, FIRST_NAME, MIDDLE_NAME, GROUP_ID};
+    }
+    
+    public static final class Subjects implements BaseColumns {
+        
+        public static final String TABLE_NAME = "subjects";
+        
+        public static final Uri CONTENT_URI =  Uri.withAppendedPath(DbContract.CONTENT_URI, TABLE_NAME);
+        
+        public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String NAME = "_name";
+        
+        public static final String SHORT_NAME = "shortname";
+        
+        public static final String[] PROJECTION_ALL = {_ID, NAME, SHORT_NAME};
+    }
+    
+    public static final class Groups implements BaseColumns {
+        
+        public static final String TABLE_NAME = "_groups";
+        
+        public static final Uri CONTENT_URI =  Uri.withAppendedPath(DbContract.CONTENT_URI, TABLE_NAME);
+        
+        public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String NAME = "_name";
+        
+        public static final String[] PROJECTION_ALL = {_ID, NAME};
+    }
+    
+    public static final class Criteries implements BaseColumns {
+        
+        public static final String TABLE_NAME = "criteries";
+        
+        public static final Uri CONTENT_URI =  Uri.withAppendedPath(DbContract.CONTENT_URI, TABLE_NAME);
+        
+        public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String SUBJECT_ID = "subject_id";
+        
+        public static final String NAME = "_name";
+        
+        public static final String DATE = "_date";
+        
+        public static final String[] PROJECTION_ALL = {_ID, SUBJECT_ID, NAME, DATE};
+    }
+    
+    public static final class Marks implements BaseColumns {
+        
+        public static final String TABLE_NAME = "marks";
+        
+        public static final Uri CONTENT_URI =  Uri.withAppendedPath(DbContract.CONTENT_URI, TABLE_NAME);
+        
+        public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/vnd.com.university.journal." + TABLE_NAME;
+        
+        public static final String STUDENT_ID = "student_id";
+        
+        public static final String CRITERIA_ID = "criteria_id";
+        
+        public static final String MARK = "mark";
+        
+        public static final String[] PROJECTION_ALL = {_ID, STUDENT_ID, CRITERIA_ID, MARK};
+    }
+}
--- a/src/com/university/journal/db/DbOpenHelper.java
+++ b/src/com/university/journal/db/DbOpenHelper.java
@ -0,0 +1,42 @@
+package com.university.journal.db;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+public final class DbOpenHelper extends SQLiteOpenHelper {
+
+    private static final String NAME = DbSchema.DB_NAME;
+    private static final int VERSION = 1;
+
+    public DbOpenHelper(Context context) {
+        super(context, NAME, null, VERSION);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        db.execSQL(DbSchema.DDL_CREATE_TBL_STUDENTS);
+        db.execSQL(DbSchema.DDL_CREATE_TBL_SUBJECTS);
+        db.execSQL(DbSchema.DDL_CREATE_TBL_GROUPS);
+        db.execSQL(DbSchema.DDL_CREATE_TBL_CRITERIES);
+        db.execSQL(DbSchema.DDL_CREATE_TBL_MARKS);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        db.execSQL(DbSchema.DDL_DROP_TBL_STUDENTS);
+        db.execSQL(DbSchema.DDL_DROP_TBL_SUBJECTS);
+        db.execSQL(DbSchema.DDL_DROP_TBL_GROUPS);
+        db.execSQL(DbSchema.DDL_DROP_TBL_CRITERIES);
+        db.execSQL(DbSchema.DDL_DROP_TBL_MARKS);
+        onCreate(db);
+    }
+
+    @Override
+    public void onOpen(SQLiteDatabase db) {
+        super.onOpen(db);
+        if (!db.isReadOnly()) {
+            db.execSQL("PRAGMA foreign_keys=ON;");
+        }
+    }
+}
--- a/src/com/university/journal/db/DbSchema.java
+++ b/src/com/university/journal/db/DbSchema.java
@ -0,0 +1,56 @@
+package com.university.journal.db;
+
+import static com.university.journal.db.DbContract.*;
+
+public interface DbSchema {
+
+    String DB_NAME = "journal.db";
+    
+    String DDL_CREATE_TBL_STUDENTS = 
+            "CREATE TABLE " + Students.TABLE_NAME + " (" +
+            Students._ID + "         INTEGER  PRIMARY KEY AUTOINCREMENT, \n" +
+            Students.LAST_NAME + "   TEXT NOT NULL, \n" +
+            Students.FIRST_NAME + "  TEXT NOT NULL, \n" +
+            Students.MIDDLE_NAME + " TEXT NOT NULL, \n" +
+            Students.GROUP_ID + "    INTEGER NOT NULL, \n" +
+            "FOREIGN KEY("+ Students.GROUP_ID + ") REFERENCES " + Groups.TABLE_NAME + "(" + Groups._ID + ") ON DELETE CASCADE \n" +
+            ")";
+            
+    String DDL_CREATE_TBL_SUBJECTS = 
+            "CREATE TABLE " + Subjects.TABLE_NAME + " (" +
+            Subjects._ID + "        INTEGER  PRIMARY KEY AUTOINCREMENT, \n" +
+            Subjects.NAME + "       TEXT NOT NULL, \n" +
+            Subjects.SHORT_NAME + " TEXT NOT NULL \n" +
+            ")";
+    
+    String DDL_CREATE_TBL_GROUPS = 
+            "CREATE TABLE " + Groups.TABLE_NAME + " (" +
+            Groups._ID + "   INTEGER  PRIMARY KEY AUTOINCREMENT, \n" +
+            Groups.NAME + "  TEXT NOT NULL \n" +
+            ")";
+    
+    String DDL_CREATE_TBL_CRITERIES = 
+            "CREATE TABLE " + Criteries.TABLE_NAME + " (" +
+            Criteries._ID + "         INTEGER  PRIMARY KEY AUTOINCREMENT, \n" +
+            Criteries.SUBJECT_ID + "  INTEGER NOT NULL, \n" +
+            Criteries.NAME + "        TEXT NOT NULL, \n" +
+            Criteries.DATE + "        TEXT NOT NULL, \n" +
+            "FOREIGN KEY("+ Criteries.SUBJECT_ID + ") REFERENCES " + Subjects.TABLE_NAME + "(" + Subjects._ID + ") ON DELETE CASCADE \n" +
+            ")";
+ 
+    String DDL_CREATE_TBL_MARKS = 
+            "CREATE TABLE " + Marks.TABLE_NAME + " (" +
+            Marks._ID + "         INTEGER  PRIMARY KEY AUTOINCREMENT, \n" +
+            Marks.STUDENT_ID + "  INTEGER NOT NULL, \n" +
+            Marks.CRITERIA_ID + " INTEGER NOT NULL, \n" +
+            Marks.MARK + "        TEXT NOT NULL, \n" +
+            "FOREIGN KEY("+ Marks.STUDENT_ID + ") REFERENCES " + Students.TABLE_NAME + "(" + Students._ID + ") ON DELETE CASCADE, \n" +
+            "FOREIGN KEY("+ Marks.CRITERIA_ID + ") REFERENCES " + Criteries.TABLE_NAME + "(" + Criteries._ID + ") ON DELETE CASCADE \n" +
+            ")";
+    
+    String DDL_DROP_TBL_STUDENTS = "DROP TABLE IF EXISTS " + Students.TABLE_NAME;
+    String DDL_DROP_TBL_SUBJECTS = "DROP TABLE IF EXISTS " + Subjects.TABLE_NAME;
+    String DDL_DROP_TBL_GROUPS = "DROP TABLE IF EXISTS " + Groups.TABLE_NAME;
+    String DDL_DROP_TBL_CRITERIES = "DROP TABLE IF EXISTS " + Criteries.TABLE_NAME;
+    String DDL_DROP_TBL_MARKS = "DROP TABLE IF EXISTS " + Marks.TABLE_NAME;
+}
--- a/src/com/university/journal/entity/Criteria.java
+++ b/src/com/university/journal/entity/Criteria.java
@ -0,0 +1,77 @@
+package com.university.journal.entity;
+
+import com.university.journal.db.DbContract.Criteries;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.provider.BaseColumns;
+
+public final class Criteria implements DatabaseSerializer {
+
+    private int id;
+    private int subjectId;
+    private String name;
+    private String date;
+    
+    public Criteria() { }
+    
+    public Criteria(String name, String date, int subjectId) {
+        this.name = name;
+        this.date = date;
+        this.subjectId = subjectId;
+    }
+
+    public int getId() {
+        return id;
+    }
+    
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    public int getSubjectId() {
+        return subjectId;
+    }
+    
+    public void setSubjectId(int subjectId) {
+        this.subjectId = subjectId;
+    }
+    
+    public String getName() {
+        return name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public String getDate() {
+        return date;
+    }
+    
+    public void setDate(String date) {
+        this.date = date;
+    }
+
+    @Override
+    public void fromCursor(Cursor cursor) {
+        id = cursor.getInt(cursor.getColumnIndex(BaseColumns._ID));
+        subjectId = cursor.getInt(cursor.getColumnIndex(Criteries.SUBJECT_ID));
+        name = cursor.getString(cursor.getColumnIndex(Criteries.NAME));
+        date = cursor.getString(cursor.getColumnIndex(Criteries.DATE));
+    }
+
+    @Override
+    public ContentValues getContentValues() {
+        ContentValues cv = new ContentValues();
+        cv.put(Criteries.NAME, name);
+        cv.put(Criteries.DATE, date);
+        cv.put(Criteries.SUBJECT_ID, subjectId);
+        return cv;
+    }
+
+    public String readableString() {
+        return name + "\n" + date;
+    }
+    
+    
+}
--- a/src/com/university/journal/entity/DatabaseSerializer.java
+++ b/src/com/university/journal/entity/DatabaseSerializer.java
@ -0,0 +1,11 @@
+package com.university.journal.entity;
+
+import android.content.ContentValues;
+import android.database.Cursor;
+
+public interface DatabaseSerializer {
+    
+    void fromCursor(Cursor cursor);
+
+    ContentValues getContentValues();
+}
--- a/src/com/university/journal/entity/Group.java
+++ b/src/com/university/journal/entity/Group.java
@ -0,0 +1,47 @@
+package com.university.journal.entity;
+
+import com.university.journal.db.DbContract.Groups;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.provider.BaseColumns;
+
+public final class Group implements DatabaseSerializer {
+
+    private int id;
+    private String name;
+    
+    public Group() { }
+    
+    public Group(String name) {
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+    
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    public String getName() {
+        return name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public void fromCursor(Cursor cursor) {
+        id = cursor.getInt(cursor.getColumnIndex(BaseColumns._ID));
+        name = cursor.getString(cursor.getColumnIndex(Groups.NAME));
+    }
+
+    @Override
+    public ContentValues getContentValues() {
+        ContentValues cv = new ContentValues();
+        cv.put(Groups.NAME, name);
+        return cv;
+    }
+}
--- a/src/com/university/journal/entity/Mark.java
+++ b/src/com/university/journal/entity/Mark.java
@ -0,0 +1,70 @@
+package com.university.journal.entity;
+
+import com.university.journal.db.DbContract.Marks;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.provider.BaseColumns;
+
+public final class Mark implements DatabaseSerializer {
+
+    private int id;
+    private int studentId, criteriaId;
+    private String mark;
+    
+    public Mark() { }
+
+    public Mark(int studentId, int criteriaId, String mark) {
+        this.studentId = studentId;
+        this.criteriaId = criteriaId;
+        this.mark = mark;
+    }
+
+    public int getId() {
+        return id;
+    }
+    
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    public int getStudentId() {
+        return studentId;
+    }
+
+    public void setStudentId(int studentId) {
+        this.studentId = studentId;
+    }
+    
+    public int getCriteriaId() {
+        return criteriaId;
+    }
+    
+    public void setCriteriaId(int criteriaId) {
+        this.criteriaId = criteriaId;
+    }
+    
+    public String getMark() {
+        return mark;
+    }
+    
+    public void setMark(String mark) {
+        this.mark = mark;
+    }
+
+    @Override
+    public void fromCursor(Cursor cursor) {
+        id = cursor.getInt(cursor.getColumnIndex(BaseColumns._ID));
+        studentId = cursor.getInt(cursor.getColumnIndex(Marks.STUDENT_ID));
+        criteriaId = cursor.getInt(cursor.getColumnIndex(Marks.CRITERIA_ID));
+        mark = cursor.getString(cursor.getColumnIndex(Marks.MARK));
+    }
+
+    @Override
+    public ContentValues getContentValues() {
+        ContentValues cv = new ContentValues();
+        cv.put(Marks.STUDENT_ID, studentId);
+        cv.put(Marks.CRITERIA_ID, criteriaId);
+        cv.put(Marks.MARK, mark);
+        return cv;
+    }
+}
--- a/src/com/university/journal/entity/MarksTableItem.java
+++ b/src/com/university/journal/entity/MarksTableItem.java
@ -0,0 +1,24 @@
+package com.university.journal.entity;
+
+public final class MarksTableItem {
+
+    private Student student;
+    private Mark[] marks;
+    
+    public MarksTableItem(Student student, Mark[] marks) {
+        this.student = student;
+        this.marks = marks;
+    }
+    
+    public Student getStudent() {
+        return student;
+    }
+    
+    public Mark getMark(int index) {
+        return marks[index];
+    }
+    
+    public void setMark(int index, Mark mark) {
+        marks[index] = mark;
+    }
+}
--- a/src/com/university/journal/entity/Student.java
+++ b/src/com/university/journal/entity/Student.java
@ -0,0 +1,83 @@
+package com.university.journal.entity;
+
+import com.university.journal.db.DbContract.Students;
+import android.content.ContentValues;
+import android.database.Cursor;
+
+public final class Student implements DatabaseSerializer {
+
+    private int id;
+    private String firstName, lastName, middleName;
+    private int groupId;
+    
+    public Student() { }
+    
+    public Student(String firstName, String lastName, String middleName, int groupId) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.middleName = middleName;
+        this.groupId = groupId;
+    }
+
+    public int getId() {
+        return id;
+    }
+    
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    public String getFirstName() {
+        return firstName;
+    }
+    
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+    
+    public String getLastName() {
+        return lastName;
+    }
+    
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+    
+    public String getMiddleName() {
+        return middleName;
+    }
+    
+    public void setMiddleName(String middleName) {
+        this.middleName = middleName;
+    }
+    
+    public int getGroupId() {
+        return groupId;
+    }
+    
+    public void setGroupId(int groupId) {
+        this.groupId = groupId;
+    }
+
+    @Override
+    public void fromCursor(Cursor cursor) {
+        firstName = cursor.getString(cursor.getColumnIndex(Students.FIRST_NAME));
+        lastName = cursor.getString(cursor.getColumnIndex(Students.LAST_NAME));
+        middleName = cursor.getString(cursor.getColumnIndex(Students.MIDDLE_NAME));
+        groupId = cursor.getInt(cursor.getColumnIndex(Students.GROUP_ID));
+    }
+
+    @Override
+    public ContentValues getContentValues() {
+        ContentValues cv = new ContentValues();
+        cv.put(Students.FIRST_NAME, firstName);
+        cv.put(Students.LAST_NAME, lastName);
+        cv.put(Students.MIDDLE_NAME, middleName);
+        cv.put(Students.GROUP_ID, groupId);
+        return cv;
+    }
+
+    public String readableString() {
+        return String.format("%s %c.%c.", lastName, firstName.charAt(0), middleName.charAt(0));
+    }
+}
--- a/src/com/university/journal/entity/Subject.java
+++ b/src/com/university/journal/entity/Subject.java
@ -0,0 +1,58 @@
+package com.university.journal.entity;
+
+import static com.university.journal.db.DbContract.Subjects;
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.provider.BaseColumns;
+
+public final class Subject implements DatabaseSerializer {
+
+    private int id;
+    private String name, shortName;
+    
+    public Subject() {}
+    
+    public Subject(String name, String shortName) {
+        this.name = name;
+        this.shortName = shortName;
+    }
+
+    public int getId() {
+        return id;
+    }
+    
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    public String getName() {
+        return name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public String getShortName() {
+        return shortName;
+    }
+    
+    public void setShortName(String shortName) {
+        this.shortName = shortName;
+    }
+
+    @Override
+    public void fromCursor(Cursor cursor) {
+        id = cursor.getInt(cursor.getColumnIndex(BaseColumns._ID));
+        name = cursor.getString(cursor.getColumnIndex(Subjects.NAME));
+        shortName = cursor.getString(cursor.getColumnIndex(Subjects.SHORT_NAME));
+    }
+
+    @Override
+    public ContentValues getContentValues() {
+        ContentValues cv = new ContentValues();
+        cv.put(Subjects.NAME, name);
+        cv.put(Subjects.SHORT_NAME, shortName);
+        return cv;
+    }
+}
--- a/src/com/university/journal/fragments/CriteriaFragment.java
+++ b/src/com/university/journal/fragments/CriteriaFragment.java
@ -0,0 +1,62 @@
+package com.university.journal.fragments;
+
+import android.content.ContentUris;
+import android.database.Cursor;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import com.university.journal.db.DbContract.Criteries;
+import com.university.journal.entity.Criteria;
+
+public final class CriteriaFragment extends DbTableFragment {
+    
+    @Override
+    protected int loaderNumber() {
+        return 3;
+    }
+    
+    @Override
+    protected String[] getUIBindFrom() {
+        return new String[] { Criteries.NAME, Criteries.DATE };
+    }
+
+    @Override
+    protected int[] getUIBindTo() {
+        return new int[] { android.R.id.text1, android.R.id.text2 };
+    }
+    
+    @Override
+    protected int getUIBindLayoutResource() {
+        return android.R.layout.simple_list_item_2;
+    }
+
+    @Override
+    protected DialogFragment getAddDataDialogFragment() {
+        return NewCriteriaDialogFragment.newInstance(mListener);
+    }
+
+    @Override
+    protected void onItemDelete(long id) {
+        getActivity().getContentResolver()
+                .delete(ContentUris.withAppendedId(Criteries.CONTENT_URI, id), null, null);
+    }
+
+    @Override
+    public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
+        return new CursorLoader(getActivity(),
+                Criteries.CONTENT_URI, Criteries.PROJECTION_ALL,
+                null, null, null);
+    }
+    
+    private NewCriteriaDialogFragment.AddListener mListener = new NewCriteriaDialogFragment.AddListener() {
+        
+        @Override
+        public void onConfirm(String name, String date, long subjectId) {
+            Criteria obj = new Criteria(name, date, (int) subjectId);
+            getActivity().getContentResolver()
+                    .insert(Criteries.CONTENT_URI, obj.getContentValues());
+            getActivity().getSupportLoaderManager().getLoader(loaderNumber()).forceLoad();
+        }
+    };
+}
--- a/src/com/university/journal/fragments/DbTableFragment.java
+++ b/src/com/university/journal/fragments/DbTableFragment.java
@ -0,0 +1,146 @@
+package com.university.journal.fragments;
+
+import android.database.Cursor;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v4.app.ListFragment;
+import android.support.v4.app.LoaderManager.LoaderCallbacks;
+import android.support.v4.content.Loader;
+import android.support.v4.widget.SimpleCursorAdapter;
+import android.support.v7.app.ActionBarActivity;
+import android.support.v7.view.ActionMode;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.AdapterView;
+import com.university.journal.R;
+
+public abstract class DbTableFragment extends ListFragment implements LoaderCallbacks<Cursor> {
+    
+    private long mSelectedId;
+    private SimpleCursorAdapter mAdapter;
+
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        setHasOptionsMenu(true);
+        
+        final String[] from = getUIBindFrom();
+        final int[] to = getUIBindTo();
+        
+        mAdapter = new SimpleCursorAdapter(getActivity(),
+                getUIBindLayoutResource(), null,
+                from, to,
+                SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
+        postInitAdapter(mAdapter);
+        setListAdapter(mAdapter);
+        setEmptyText(getString(R.string.no_data));
+        
+        getListView().setOnItemLongClickListener(mItemLongClickListener);
+        getActivity().getSupportLoaderManager().initLoader(loaderNumber(), null, this);
+    }
+    
+    protected abstract String[] getUIBindFrom();
+    
+    protected int[] getUIBindTo() {
+        return new int[] { android.R.id.text1 };
+    }
+    
+    protected int getUIBindLayoutResource() {
+        return android.R.layout.simple_list_item_1;
+    }
+    
+    protected void postInitAdapter(SimpleCursorAdapter adapter) { }
+    
+    protected abstract int loaderNumber();
+    
+    protected abstract DialogFragment getAddDataDialogFragment();
+    
+    protected abstract void onItemDelete(long id);
+    
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.add_item, menu);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.action_add:
+                FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
+                getAddDataDialogFragment().show(ft, "dialog");
+                return true;
+        }
+        return false;
+    }
+    
+    @Override
+    public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
+        if (mAdapter != null) {
+            mAdapter.swapCursor(cursor);
+        }
+        if (isResumed()) {
+            setListShown(true);
+        } else {
+            setListShownNoAnimation(true);
+        }
+    }
+
+    @Override
+    public void onLoaderReset(Loader<Cursor> loader) {
+        if (mAdapter != null) {
+            mAdapter.swapCursor(null);
+        }
+    }
+    
+    private final AdapterView.OnItemLongClickListener mItemLongClickListener =
+            new AdapterView.OnItemLongClickListener() {
+
+        @Override
+        public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+            mSelectedId = id;
+            ((ActionBarActivity) getActivity()).startSupportActionMode(mActionCallback);
+            return true;
+        }
+        
+    };
+    
+    private final ActionMode.Callback mActionCallback = new ActionMode.Callback() {
+
+        @Override
+        public boolean onActionItemClicked(ActionMode actionMode, MenuItem menuItem) {
+            // Similar to menu handling in Activity.onOptionsItemSelected()
+            switch (menuItem.getItemId()) {
+                case R.id.action_delete:
+                    // Some remove functionality
+                    onItemDelete(mSelectedId);
+                    getActivity().getSupportLoaderManager().getLoader(loaderNumber()).forceLoad();
+                    actionMode.finish();
+                    return true;
+            }
+
+            return false;
+        }
+
+        @Override
+        public boolean onCreateActionMode(ActionMode actionMode, Menu menu) {
+            // Inflate our menu from a resource file
+            actionMode.getMenuInflater().inflate(R.menu.item_context, menu);
+
+            // Return true so that the action mode is shown
+            return true;
+        }
+
+        @Override
+        public void onDestroyActionMode(ActionMode actionMode) {
+            // Allows you to be notified when the action mode is dismissed
+        }
+
+        @Override
+        public boolean onPrepareActionMode(ActionMode actionMode, Menu menu) {
+            return false;
+        }
+    };
+}
--- a/src/com/university/journal/fragments/GroupFragment.java
+++ b/src/com/university/journal/fragments/GroupFragment.java
@ -0,0 +1,51 @@
+package com.university.journal.fragments;
+
+import android.content.ContentUris;
+import android.database.Cursor;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import com.university.journal.db.DbContract.Groups;
+import com.university.journal.entity.Group;
+
+public final class GroupFragment extends DbTableFragment {
+    
+    @Override
+    protected int loaderNumber() {
+        return 1;
+    }
+    
+    @Override
+    protected String[] getUIBindFrom() {
+        return new String[] { Groups.NAME };
+    }
+
+    @Override
+    protected DialogFragment getAddDataDialogFragment() {
+        return NewGroupDialogFragment.newInstance(mListener);
+    }
+
+    @Override
+    protected void onItemDelete(long id) {
+        getActivity().getContentResolver()
+                .delete(ContentUris.withAppendedId(Groups.CONTENT_URI, id), null, null);
+    }
+
+    @Override
+    public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
+        return new CursorLoader(getActivity(),
+                Groups.CONTENT_URI, Groups.PROJECTION_ALL,
+                null, null, null);
+    }
+    
+    private NewGroupDialogFragment.AddListener mListener = new NewGroupDialogFragment.AddListener() {
+        
+        @Override
+        public void onConfirm(String name) {
+            Group obj = new Group(name);
+            getActivity().getContentResolver().insert(Groups.CONTENT_URI, obj.getContentValues());
+            getActivity().getSupportLoaderManager().getLoader(loaderNumber()).forceLoad();
+        }
+    };
+}
--- a/src/com/university/journal/fragments/MainFragment.java
+++ b/src/com/university/journal/fragments/MainFragment.java
@ -0,0 +1,244 @@
+package com.university.journal.fragments;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.nio.charset.Charset;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.List;
+import android.database.Cursor;
+import android.os.Bundle;
+import android.os.Environment;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v4.widget.SimpleCursorAdapter;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.Spinner;
+import android.widget.Toast;
+import com.inqbarna.tablefixheaders.TableFixHeaders;
+import com.inqbarna.tablefixheaders.adapters.TableAdapter;
+import com.university.journal.EmptyTableAdapter;
+import com.university.journal.MarksTableAdapter;
+import com.university.journal.R;
+import com.university.journal.db.ContentManager;
+import com.university.journal.db.DbContract.Groups;
+import com.university.journal.db.DbContract.Subjects;
+import com.university.journal.entity.Criteria;
+import com.university.journal.entity.Mark;
+import com.university.journal.entity.MarksTableItem;
+import com.university.journal.entity.Student;
+
+public final class MainFragment extends Fragment {
+    
+    private static TableAdapter sEmptyAdapter;
+    
+    private Spinner mSubjectSpinner, mGroupSpinner;
+    private TableFixHeaders mTable;
+    private MarksTableAdapter mAdapter;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_main, container, false);
+        setHasOptionsMenu(true);
+        
+        mSubjectSpinner = (Spinner) view.findViewById(R.id.subjectSpinner);
+        mGroupSpinner  = (Spinner) view.findViewById(R.id.groupSpinner);
+        mTable = (TableFixHeaders) view.findViewById(R.id.table);
+        
+        Cursor cur = getActivity().getContentResolver()
+                .query(Subjects.CONTENT_URI, Subjects.PROJECTION_ALL, null, null, null);
+        String[] from = new String[] { Subjects.NAME };
+        int[] to = new int[] { android.R.id.text1 };
+        SimpleCursorAdapter adapter = new SimpleCursorAdapter(getActivity(),
+                android.R.layout.simple_spinner_item, cur,
+                from, to, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        mSubjectSpinner.setAdapter(adapter);
+        mSubjectSpinner.setOnItemSelectedListener(mSpinnerListener);
+        
+        cur = getActivity().getContentResolver()
+                .query(Groups.CONTENT_URI, Groups.PROJECTION_ALL, null, null, null);
+        from = new String[] { Groups.NAME };
+        to = new int[] { android.R.id.text1 };
+        adapter = new SimpleCursorAdapter(getActivity(),
+                android.R.layout.simple_spinner_item, cur,
+                from, to, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        mGroupSpinner.setAdapter(adapter);
+        mGroupSpinner.setOnItemSelectedListener(mSpinnerListener);
+        
+        sEmptyAdapter = new EmptyTableAdapter(getActivity());
+        mTable.setAdapter(sEmptyAdapter);
+        return view;
+    }
+    
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.main, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+    
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.action_export:
+                export();
+                return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+    
+    private void export() {
+        if (mAdapter == null) return;
+        
+        final String SEP = ",", NEWLINE = "\r\n";
+        StringBuilder csv = new StringBuilder();
+        // For correctly open in Excel
+        csv.append("sep=").append(SEP).append(NEWLINE);
+        // Headers
+        csv.append("Ñòóäåíò").append(SEP);
+        for (int i = 0; i < mAdapter.getColumnCount(); i++) {
+            Criteria cr = mAdapter.getHeader(i);
+            String header = cr.getName() + " / " + cr.getDate();// cr.readableString();
+            csv.append(header).append(SEP);
+        }
+        csv.append(NEWLINE);
+        // Data
+        for (int i = 0; i < mAdapter.getRowCount(); i++) {
+            MarksTableItem item = mAdapter.getItem(i);
+            csv.append(item.getStudent().readableString()).append(SEP);
+            for (int j = 0; j < mAdapter.getColumnCount(); j++) {
+                csv.append(item.getMark(j).getMark()).append(SEP);
+            }
+            csv.append(NEWLINE);
+        }
+        
+        // Save to sdcard
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH_mm_ss");
+        String fullPath = Environment.getExternalStorageDirectory() +
+                File.separator + sdf.format(new Date()) + ".csv";
+        try {
+            Charset charset = Charset.isSupported("CP1251") 
+                    ? Charset.forName("CP1251") : Charset.defaultCharset();
+            FileOutputStream out = new FileOutputStream(new File(fullPath));
+            OutputStreamWriter writer = new OutputStreamWriter(out, charset);
+            writer.write(csv.toString());
+            writer.flush();
+            writer.close();
+            Toast.makeText(getActivity(),
+                    getString(R.string.saved) + " " + fullPath,
+                    Toast.LENGTH_SHORT).show();
+        } catch (IOException ioe) {
+            ioe.printStackTrace();
+        }
+    }
+
+    private void showTable() {
+        long subjectId = mSubjectSpinner.getSelectedItemId();
+        if (subjectId == AdapterView.INVALID_ROW_ID) return;
+        
+        long groupId = mGroupSpinner.getSelectedItemId();
+        if (groupId == AdapterView.INVALID_ROW_ID) return;
+        
+        // Get criteries
+        List<Criteria> criteries = ContentManager
+                .with(getActivity().getContentResolver())
+                .getCriteries(subjectId);
+        if (criteries.isEmpty()) return;
+        final Criteria[] headers = criteries.toArray(new Criteria[0]);
+        
+        // Get students
+        List<Student> students = ContentManager
+                .with(getActivity().getContentResolver())
+                .getStudents(groupId);
+        
+        // Get marks
+        MarksTableItem[] items = new MarksTableItem[students.size()];
+        for (int i = 0; i < items.length; i++) {
+            final Student student = students.get(i);
+            final int studentId = student.getId();
+            Mark[] marks = new Mark[headers.length];
+            for (int j = 0; j < headers.length; j++) {
+                marks[j] = new Mark(studentId, headers[j].getId(), "");
+            }
+            
+            Cursor cursor = ContentManager
+                    .with(getActivity().getContentResolver())
+                    .getMarksCursor(studentId);
+            if (cursor != null) {
+                while (cursor.moveToNext()) {
+                    Mark obj = new Mark();
+                    obj.fromCursor(cursor);
+                    for (int j = 0; j < headers.length; j++) {
+                        if (headers[j].getId() == obj.getId()) {
+                            marks[j] = obj;
+                            break;
+                        }
+                    }
+                }
+            }
+            items[i] = new MarksTableItem(student, marks);
+        }
+        mAdapter = new MarksTableAdapter(getActivity(), headers, items);
+        mAdapter.setMarkClickListener(mMarksButtonListener);
+        mTable.setAdapter(mAdapter);
+    }
+    
+    private final View.OnClickListener mMarksButtonListener =
+            new View.OnClickListener() {
+        
+        @Override
+        public void onClick(View v) {
+            final int column = (int) v.getTag(R.id.tag_column);
+            final int row = (int) v.getTag(R.id.tag_row);
+            
+            final Mark mark = mAdapter.getItem(row).getMark(column);
+            DialogFragment frag = NewMarkDialogFragment.newInstance(mAddListener,
+                    mark.getCriteriaId(), mark.getStudentId(), mark.getMark(),
+                    row, column);
+            
+            FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
+            frag.show(ft, "dialog");
+        }
+    };
+    
+    private NewMarkDialogFragment.AddListener mAddListener = new NewMarkDialogFragment.AddListener() {
+        
+        @Override
+        public void onConfirm(int row, int column, Mark mark) {
+            ContentManager.with(getActivity().getContentResolver())
+                    .insertOrUpdate(mark);            
+            mAdapter.getItem(row).setMark(column, mark);
+            mAdapter.notifyDataSetChanged();
+        }
+    };
+    
+    private final AdapterView.OnItemSelectedListener mSpinnerListener =
+            new AdapterView.OnItemSelectedListener() {
+
+        @Override
+        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+            showTable();
+            boolean empty = (mTable.getAdapter() == null) ||
+                    (mTable.getAdapter().getColumnCount() == 0);
+            if (empty) {
+                mTable.setAdapter(sEmptyAdapter);
+            }
+        }
+
+        @Override
+        public void onNothingSelected(AdapterView<?> parent) {
+            mTable.setAdapter(sEmptyAdapter);
+        }
+    };
+    
+}
--- a/src/com/university/journal/fragments/NewCriteriaDialogFragment.java
+++ b/src/com/university/journal/fragments/NewCriteriaDialogFragment.java
@ -0,0 +1,77 @@
+package com.university.journal.fragments;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Locale;
+import android.database.Cursor;
+import android.support.v4.widget.SimpleCursorAdapter;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+import android.widget.Spinner;
+import com.university.journal.R;
+import com.university.journal.db.DbContract.Subjects;
+
+public final class NewCriteriaDialogFragment extends NewItemDialogFragment {
+    
+    public interface AddListener {
+        void onConfirm(String name, String date, long subjectId);
+    };
+    
+    private AddListener mListener;
+    private EditText mNameEditText, mDateEditText;
+    private Spinner subjectSpinner;
+    private SimpleCursorAdapter mSpinnerAdapter;
+    
+    public static NewCriteriaDialogFragment newInstance(AddListener listener) {
+        NewCriteriaDialogFragment frag = new NewCriteriaDialogFragment();
+        frag.mListener = listener;
+        frag.setCancelable(false);
+        return frag;
+    }
+    
+    @Override
+    protected View inflate(LayoutInflater inflater) {
+        View view = inflater.inflate(R.layout.dialog_add_criteria, null, false);
+        mNameEditText = (EditText) view.findViewById(R.id.name);
+        mDateEditText = (EditText) view.findViewById(R.id.date);
+        subjectSpinner = (Spinner) view.findViewById(R.id.subjectSpinner);
+        
+        final Cursor cur = getActivity().getContentResolver()
+                .query(Subjects.CONTENT_URI, Subjects.PROJECTION_ALL, null, null, null);
+        final String[] from = new String[] { Subjects.NAME };
+        final int[] to = new int[] { android.R.id.text1 };
+        mSpinnerAdapter = new SimpleCursorAdapter(getActivity(),
+                android.R.layout.simple_spinner_item, cur,
+                from, to, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
+        mSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        subjectSpinner.setAdapter(mSpinnerAdapter);
+        return view;
+    }
+
+    @Override
+    protected boolean validate() {
+        if (mNameEditText == null) return false;
+        final String name = mNameEditText.getText().toString();
+        if (TextUtils.isEmpty(name)) return false;
+        
+        if (mDateEditText == null) return false;
+        final String date = mDateEditText.getText().toString();
+        if (TextUtils.isEmpty(date)) return false;
+        try {
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
+            sdf.setLenient(false);
+            sdf.parse(date);
+        } catch (ParseException ex) {
+            return false;
+        }
+        
+        if (subjectSpinner.getSelectedItem() == null) return false;
+        
+        if (mListener != null) {
+            mListener.onConfirm(name, date, subjectSpinner.getSelectedItemId());
+        }
+        return true;
+    }
+}
--- a/src/com/university/journal/fragments/NewGroupDialogFragment.java
+++ b/src/com/university/journal/fragments/NewGroupDialogFragment.java
@ -0,0 +1,43 @@
+package com.university.journal.fragments;
+
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+import com.university.journal.R;
+
+public final class NewGroupDialogFragment extends NewItemDialogFragment {
+    
+    public interface AddListener {
+        void onConfirm(String name);
+    };
+    
+    private AddListener mListener;
+    private EditText mNameEditText;
+    
+    public static NewGroupDialogFragment newInstance(AddListener listener) {
+        NewGroupDialogFragment frag = new NewGroupDialogFragment();
+        frag.mListener = listener;
+        frag.setCancelable(false);
+        return frag;
+    }
+    
+    @Override
+    protected View inflate(LayoutInflater inflater) {
+        View view = inflater.inflate(R.layout.dialog_add_group, null, false);
+        mNameEditText = (EditText) view.findViewById(R.id.name);
+        return view;
+    }
+
+    @Override
+    protected boolean validate() {
+        if (mNameEditText == null) return false;
+        final String name = mNameEditText.getText().toString();
+        if (TextUtils.isEmpty(name)) return false;
+        
+        if (mListener != null) {
+            mListener.onConfirm(name);
+        }
+        return true;
+    }
+}
--- a/src/com/university/journal/fragments/NewItemDialogFragment.java
+++ b/src/com/university/journal/fragments/NewItemDialogFragment.java
@ -0,0 +1,51 @@
+package com.university.journal.fragments;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.Toast;
+import com.university.journal.R;
+
+public abstract class NewItemDialogFragment extends DialogFragment {
+   
+    protected abstract View inflate(LayoutInflater inflater);
+    
+    protected abstract boolean validate();
+    
+    @Override
+    public void onStart() {
+        super.onStart();
+        final AlertDialog dialog = (AlertDialog) getDialog();
+        if (dialog != null) {
+            dialog.getButton(Dialog.BUTTON_POSITIVE)
+                    .setOnClickListener(new View.OnClickListener() {
+                
+                @Override
+                public void onClick(View v) {
+                    if (validate()) {
+                        dismiss();
+                    } else {
+                        Toast.makeText(getActivity(), 
+                                getString(R.string.validate_error),
+                                Toast.LENGTH_SHORT).show();
+                    }
+                }
+            });
+        }
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        View view = inflate(LayoutInflater.from(getActivity()));
+        
+        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        builder.setView(view);
+        builder.setTitle(R.string.add);
+        builder.setPositiveButton(android.R.string.ok, null);
+        builder.setNegativeButton(android.R.string.cancel, null);
+        return builder.create();
+    }
+}
--- a/src/com/university/journal/fragments/NewMarkDialogFragment.java
+++ b/src/com/university/journal/fragments/NewMarkDialogFragment.java
@ -0,0 +1,79 @@
+package com.university.journal.fragments;
+
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+import com.university.journal.R;
+import com.university.journal.entity.Mark;
+
+public final class NewMarkDialogFragment extends NewItemDialogFragment {
+    
+    private static final String ARG_MARK_VALUE = "mark",
+            ARG_CRITERIA_ID = "criteria_id",
+            ARG_STUDENT_ID = "student_id",
+            ARG_TABLE_ROW = "table_row",
+            ARG_TABLE_COL = "table_col";
+    
+    public interface AddListener {
+        void onConfirm(int row, int col, Mark mark);
+    };
+    
+    private AddListener mListener;
+    private EditText mMarkEditText;
+    private Mark mMark;
+    private int mRow, mCol;
+    
+    public static NewMarkDialogFragment newInstance(AddListener listener,
+            int criteriaId, int studentId, String markValue,
+            int row, int col) {
+        NewMarkDialogFragment frag = new NewMarkDialogFragment();
+        frag.mListener = listener;
+        frag.setCancelable(false);
+        
+        final Bundle args = new Bundle();
+        args.putString(ARG_MARK_VALUE, markValue);
+        args.putInt(ARG_CRITERIA_ID, criteriaId);
+        args.putInt(ARG_STUDENT_ID, studentId);
+        args.putInt(ARG_TABLE_ROW, row);
+        args.putInt(ARG_TABLE_COL, col);
+        frag.setArguments(args);
+        return frag;
+    }
+    
+    @Override
+    protected View inflate(LayoutInflater inflater) {
+        View view = inflater.inflate(R.layout.dialog_add_mark, null, false);
+        mMarkEditText = (EditText) view.findViewById(R.id.mark);
+        
+        mMark = new Mark();
+        final Bundle args = getArguments();
+        if (args != null) {
+            final String markValue = args.getString(ARG_MARK_VALUE);
+            mMark.setMark(markValue);
+            mMark.setCriteriaId(args.getInt(ARG_CRITERIA_ID));
+            mMark.setStudentId(args.getInt(ARG_STUDENT_ID));
+            mRow = args.getInt(ARG_TABLE_ROW);
+            mCol = args.getInt(ARG_TABLE_COL);
+            mMarkEditText.setText(markValue);
+        }
+        return view;
+    }
+
+    @Override
+    protected boolean validate() {
+        if (mMarkEditText == null) return false;
+        final String markValue = mMarkEditText.getText().toString();
+        if (TextUtils.isEmpty(markValue)) return false;
+        
+        // No edit mark - not update.
+        if (mMark.getMark().equals(markValue)) return true;
+        mMark.setMark(markValue);
+        
+        if (mListener != null) {
+            mListener.onConfirm(mRow, mCol, mMark);
+        }
+        return true;
+    }
+}
--- a/src/com/university/journal/fragments/NewStudentDialogFragment.java
+++ b/src/com/university/journal/fragments/NewStudentDialogFragment.java
@ -0,0 +1,72 @@
+package com.university.journal.fragments;
+
+import android.database.Cursor;
+import android.support.v4.widget.SimpleCursorAdapter;
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+import android.widget.Spinner;
+import com.university.journal.R;
+import com.university.journal.db.DbContract.Groups;
+
+public final class NewStudentDialogFragment extends NewItemDialogFragment {
+    
+    public interface AddListener {
+        void onConfirm(String firstName, String lastName, String middleName, long groupId);
+    };
+    
+    private AddListener mListener;
+    private EditText mFirtsNameEditText, mLastNameEditText, mMiddleNameEditText;
+    private Spinner mGroupSpinner;
+    private SimpleCursorAdapter mSpinnerAdapter;
+    
+    public static NewStudentDialogFragment newInstance(AddListener listener) {
+        NewStudentDialogFragment frag = new NewStudentDialogFragment();
+        frag.mListener = listener;
+        frag.setCancelable(false);
+        return frag;
+    }
+    
+    @Override
+    protected View inflate(LayoutInflater inflater) {
+        View view = inflater.inflate(R.layout.dialog_add_student, null, false);
+        mFirtsNameEditText = (EditText) view.findViewById(R.id.firstname);
+        mLastNameEditText = (EditText) view.findViewById(R.id.lastname);
+        mMiddleNameEditText = (EditText) view.findViewById(R.id.middlename);
+        mGroupSpinner = (Spinner) view.findViewById(R.id.groupSpinner);
+        
+        final Cursor cur = getActivity().getContentResolver()
+                .query(Groups.CONTENT_URI, Groups.PROJECTION_ALL, null, null, null);
+        final String[] from = new String[] { Groups.NAME };
+        final int[] to = new int[] { android.R.id.text1 };
+        mSpinnerAdapter = new SimpleCursorAdapter(getActivity(),
+                android.R.layout.simple_spinner_item, cur,
+                from, to, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
+        mSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        mGroupSpinner.setAdapter(mSpinnerAdapter);
+        return view;
+    }
+
+    @Override
+    protected boolean validate() {
+        if (mFirtsNameEditText == null) return false;
+        final String firstName = mFirtsNameEditText.getText().toString();
+        if (TextUtils.isEmpty(firstName)) return false;
+        
+        if (mLastNameEditText == null) return false;
+        final String lastName = mLastNameEditText.getText().toString();
+        if (TextUtils.isEmpty(lastName)) return false;
+        
+        if (mMiddleNameEditText == null) return false;
+        final String middleName = mMiddleNameEditText.getText().toString();
+        if (TextUtils.isEmpty(middleName)) return false;
+        
+        if (mGroupSpinner.getSelectedItem() == null) return false;
+        
+        if (mListener != null) {
+            mListener.onConfirm(firstName, lastName, middleName, mGroupSpinner.getSelectedItemId());
+        }
+        return true;
+    }
+}
--- a/src/com/university/journal/fragments/NewSubjectDialogFragment.java
+++ b/src/com/university/journal/fragments/NewSubjectDialogFragment.java
@ -0,0 +1,48 @@
+package com.university.journal.fragments;
+
+import android.text.TextUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.EditText;
+import com.university.journal.R;
+
+public final class NewSubjectDialogFragment extends NewItemDialogFragment {
+    
+    public interface AddListener {
+        void onConfirm(String name, String shortName);
+    };
+    
+    private AddListener mListener;
+    private EditText mNameEditText, mShortNameEditText;
+    
+    public static NewSubjectDialogFragment newInstance(AddListener listener) {
+        NewSubjectDialogFragment frag = new NewSubjectDialogFragment();
+        frag.mListener = listener;
+        frag.setCancelable(false);
+        return frag;
+    }
+    
+    @Override
+    protected View inflate(LayoutInflater inflater) {
+        View view = inflater.inflate(R.layout.dialog_add_subject, null, false);
+        mNameEditText = (EditText) view.findViewById(R.id.name);
+        mShortNameEditText = (EditText) view.findViewById(R.id.shortName);
+        return view;
+    }
+
+    @Override
+    protected boolean validate() {
+        if (mNameEditText == null) return false;
+        final String name = mNameEditText.getText().toString();
+        if (TextUtils.isEmpty(name)) return false;
+        
+        if (mShortNameEditText == null) return false;
+        final String shortName = mShortNameEditText.getText().toString();
+        if (TextUtils.isEmpty(shortName)) return false;
+        
+        if (mListener != null) {
+            mListener.onConfirm(name, shortName);
+        }
+        return true;
+    }
+}
--- a/src/com/university/journal/fragments/StudentFragment.java
+++ b/src/com/university/journal/fragments/StudentFragment.java
@ -0,0 +1,105 @@
+package com.university.journal.fragments;
+
+import android.content.ContentUris;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import android.support.v4.widget.SimpleCursorAdapter;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.TextView;
+import android.widget.Toast;
+import com.university.journal.db.DbContract;
+import com.university.journal.db.DbContract.Groups;
+import com.university.journal.db.DbContract.Students;
+import com.university.journal.entity.Student;
+
+public final class StudentFragment extends DbTableFragment {
+    
+    @Override
+    protected int loaderNumber() {
+        return 2;
+    }
+    
+    @Override
+    protected String[] getUIBindFrom() {
+        return new String[] { Students.LAST_NAME, Students.FIRST_NAME, Students.MIDDLE_NAME };
+    }
+
+    @Override
+    protected int[] getUIBindTo() {
+        return new int[] { android.R.id.text1 };
+    }
+    
+    @Override
+    protected int getUIBindLayoutResource() {
+        return android.R.layout.simple_list_item_1;
+    }
+    
+    @Override
+    protected void postInitAdapter(SimpleCursorAdapter adapter) {
+        adapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
+            
+            @Override
+            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
+                final String lastName = cursor.getString(1);
+                final String firstName = cursor.getString(2);
+                final String middleName = cursor.getString(3);
+                TextView textView = (TextView) view;
+                textView.setText(String.format("%s %s %s",
+                        lastName, firstName, middleName));
+                return true;
+            }
+        });
+        getListView().setOnItemClickListener(mItemClickListener);
+    }
+
+    @Override
+    protected DialogFragment getAddDataDialogFragment() {
+        return NewStudentDialogFragment.newInstance(mListener);
+    }
+
+    @Override
+    protected void onItemDelete(long id) {
+        getActivity().getContentResolver()
+                .delete(ContentUris.withAppendedId(Students.CONTENT_URI, id), null, null);
+    }
+
+    @Override
+    public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
+        return new CursorLoader(getActivity(),
+                Students.CONTENT_URI, Students.PROJECTION_ALL,
+                null, null, Students.LAST_NAME);
+    }
+    
+    private final AdapterView.OnItemClickListener mItemClickListener =
+            new AdapterView.OnItemClickListener() {
+
+        @Override
+        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+            String selection = String.format("%s.%s = ?", Students.TABLE_NAME, Students._ID);
+            String[] args = { String.valueOf(id) };
+            Cursor cursor = getActivity().getContentResolver()
+                    .query(Uri.withAppendedPath(DbContract.CONTENT_URI, "group_by_student"),
+                            null, selection, args, null);
+            if ( (cursor != null) && (cursor.moveToFirst()) ) {
+                String group = cursor.getString(cursor.getColumnIndex(Groups.NAME));
+                Toast.makeText(getActivity(), group, Toast.LENGTH_SHORT).show();
+            }
+        }
+    };
+    
+    private NewStudentDialogFragment.AddListener mListener = new NewStudentDialogFragment.AddListener() {
+        
+        @Override
+        public void onConfirm(String firstName, String lastName, String middleName, long groupId) {
+            Student obj = new Student(firstName, lastName, middleName, (int) groupId);
+            getActivity().getContentResolver()
+                    .insert(Students.CONTENT_URI, obj.getContentValues());
+            getActivity().getSupportLoaderManager().getLoader(loaderNumber()).forceLoad();
+        }
+    };
+}
--- a/src/com/university/journal/fragments/SubjectFragment.java
+++ b/src/com/university/journal/fragments/SubjectFragment.java
@ -0,0 +1,51 @@
+package com.university.journal.fragments;
+
+import android.content.ContentUris;
+import android.database.Cursor;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.content.CursorLoader;
+import android.support.v4.content.Loader;
+import com.university.journal.db.DbContract.Subjects;
+import com.university.journal.entity.Subject;
+
+public final class SubjectFragment extends DbTableFragment {
+    
+    @Override
+    protected int loaderNumber() {
+        return 0;
+    }
+    
+    @Override
+    protected String[] getUIBindFrom() {
+        return new String[] { Subjects.NAME };
+    }
+
+    @Override
+    protected DialogFragment getAddDataDialogFragment() {
+        return NewSubjectDialogFragment.newInstance(mListener);
+    }
+
+    @Override
+    protected void onItemDelete(long id) {
+        getActivity().getContentResolver()
+                .delete(ContentUris.withAppendedId(Subjects.CONTENT_URI, id), null, null);
+    }
+
+    @Override
+    public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
+        return new CursorLoader(getActivity(),
+                Subjects.CONTENT_URI, Subjects.PROJECTION_ALL,
+                null, null, null);
+    }
+    
+    private NewSubjectDialogFragment.AddListener mListener = new NewSubjectDialogFragment.AddListener() {
+        
+        @Override
+        public void onConfirm(String name, String shortName) {
+            Subject obj = new Subject(name, shortName);
+            getActivity().getContentResolver().insert(Subjects.CONTENT_URI, obj.getContentValues());
+            getActivity().getSupportLoaderManager().getLoader(loaderNumber()).forceLoad();
+        }
+    };
+}