gstreamer/tutorials/android-tutorial-3/res/layout/main.xml

<?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:gravity="center_vertical"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textview_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dip"
        android:gravity="center_horizontal" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dip"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >

        <ImageButton
            android:id="@+id/button_play"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/button_play"
            android:src="@android:drawable/ic_media_play"
            android:text="@string/button_play" />

        <ImageButton
            android:id="@+id/button_stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/button_stop"
            android:src="@android:drawable/ic_media_pause"
            android:text="@string/button_stop" />
    </LinearLayout>

    <org.freedesktop.gstreamer.tutorials.tutorial_3.GStreamerSurfaceView
        android:id="@+id/surface_video"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical|center_horizontal" />

</LinearLayout>