Ability to change brightness on device

SocketFileTransfer/src/main/java/com/annimon/socketfiletransfer/ServerActivity.java

@@ -7,12 +7,18 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.text.format.Formatter;
+import android.view.WindowManager;
 import android.widget.TextView;
 
+import com.annimon.socketfiletransfer.operations.Operation;
 import com.annimon.socketfiletransfer.util.Console;
 
 public class ServerActivity extends Activity {
 
+    public static final int
+            UPDATE_CONSOLE = 1,
+            CHANGE_BRIGHTNESS = 2;
+
     private TextView messagesHistory;
 
     @Override
@@ -23,14 +29,8 @@ public class ServerActivity extends Activity {
         messagesHistory = (TextView) findViewById(R.id.messages_history);
         messagesHistory.setText(Console.getAllText());
 
-        Handler handler = new Handler() {
-
-            @Override
-            public void handleMessage(Message msg) {
-                messagesHistory.setText(Console.getAllText());
-            }
-        };
         Console.setHandler(handler);
+        Operation.setHandler(handler);
 
         WifiManager wifiMgr = (WifiManager) getSystemService(WIFI_SERVICE);
         WifiInfo wifiInfo = wifiMgr.getConnectionInfo();
@@ -41,5 +41,21 @@ public class ServerActivity extends Activity {
         new SocketTransferTask(OperationListener.MODE_SERVER).execute();
     }
 
+    private final Handler handler = new Handler() {
+
+        @Override
+        public void handleMessage(Message msg) {
+            if (msg.what == UPDATE_CONSOLE) {
+                messagesHistory.setText(Console.getAllText());
+            } else if (msg.what == CHANGE_BRIGHTNESS) {
+                int brightness = msg.arg1;
+
+                WindowManager.LayoutParams lp = getWindow().getAttributes();
+                lp.screenBrightness = brightness / 100.0f;
+                getWindow().setAttributes(lp);
+            }
+
+        }
+    };
 
 }

SocketFileTransfer/src/main/java/com/annimon/socketfiletransfer/operations/BrightnessOperation.java

@@ -1,6 +1,10 @@
 package com.annimon.socketfiletransfer.operations;
 
+import android.os.Message;
+
 import com.annimon.socketfiletransfer.OperationListener;
+import com.annimon.socketfiletransfer.ServerActivity;
+
 /**
  * @author aNNiMON
  */
@@ -8,7 +12,21 @@ public class BrightnessOperation extends Operation {
 
     @Override
     public void startServerSide() throws Exception {
+        String value = dis.readUTF();
 
+        int brightness;
+        try {
+            brightness = Integer.parseInt(value);
+        } catch (NumberFormatException ex) {
+            brightness = 30;
+        }
+
+        if (handler != null) {
+            Message msg = new Message();
+            msg.what = ServerActivity.CHANGE_BRIGHTNESS;
+            msg.arg1 = brightness;
+            handler.sendMessage(msg);
+        }
     }
 
     @Override

SocketFileTransfer/src/main/java/com/annimon/socketfiletransfer/operations/Operation.java

@@ -1,5 +1,7 @@
 package com.annimon.socketfiletransfer.operations;
 
+import android.os.Handler;
+
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 
@@ -9,9 +11,15 @@ import java.io.DataOutputStream;
  */
 public abstract class Operation {
 
+    protected static Handler handler;
+
     protected DataInputStream dis;
     protected DataOutputStream dos;
 
+    public static void setHandler(Handler handler) {
+        Operation.handler = handler;
+    }
+
     public void setDataInputStream(DataInputStream dis) {
         this.dis = dis;
     }

SocketFileTransfer/src/main/java/com/annimon/socketfiletransfer/util/Console.java

@@ -2,6 +2,8 @@ package com.annimon.socketfiletransfer.util;
 
 import android.os.Handler;
 
+import com.annimon.socketfiletransfer.ServerActivity;
+
 /**
  * @author aNNiMON
  */
@@ -12,12 +14,11 @@ public class Console {
 
     public static void print(String message) {
         allText.append(message);
-        if (handler != null) handler.sendEmptyMessage(1);
+        if (handler != null) handler.sendEmptyMessage(ServerActivity.UPDATE_CONSOLE);
     }
 
     public static void println(String message) {
-        print(message);
+        print(message + "\r\n");
-        print("\r\n");
     }
 
     public static String getAllText() {