rosjava/android_tutorial_map_viewer/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:orientation="vertical" >

    <org.ros.android.view.visualization.VisualizationView
        android:id="@+id/visualization"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="3dip" >

        <ToggleButton
            android:id="@+id/follow_me_toggle_button"
            style="@style/ButtonFont"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onFollowMeToggleButtonClicked"
            android:textOff="Follow Me"
            android:textOn="Follow Me" />

        <Button
            android:id="@+id/clear_map_button"
            style="@style/ButtonFont"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClearMapButtonClicked"
            android:text="Clear Map" />

        <Button
            android:id="@+id/save_map_button"
            style="@style/ButtonFont"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onSaveMapButtonClicked"
            android:text="Save Map" />
    </LinearLayout>

</LinearLayout>