samples/VirtualDeviceManager/demos/res/layout/main_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp">

    <Button
        android:id="@+id/activity_policy_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/activity_policy_demo" />

    <Button
        android:id="@+id/sensor_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/sensor_demo" />

    <Button
        android:id="@+id/display_power_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/display_power_demo" />

    <Button
        android:id="@+id/vibration_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/vibration_demo" />

    <Button
        android:id="@+id/rotation_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/rotation_demo" />

    <Button
        android:id="@+id/home_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/home_demo" />

    <Button
        android:id="@+id/permissions_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/permissions_demo" />

    <Button
        android:id="@+id/latency_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/latency_demo" />

    <Button
        android:id="@+id/stylus_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/stylus_demo" />

    <Button
        android:id="@+id/recorder_demo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onDemoSelected"
        android:text="@string/recorder_demo" />

</LinearLayout>