DonetskWebcam/res/layout-land/main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <fragment
        android:id="@+id/webcamViewerFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="fill"
        class="com.annimon.donetskwebcam.WebcamViewerFragment"/>
        
    <fragment
        android:id="@+id/webcamChooserFragment"
        android:layout_width="120dp"
        android:layout_height="match_parent"
        android:layout_gravity="left"
        class="com.annimon.donetskwebcam.WebcamChooserFragment" />
    
</FrameLayout>