1<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 android:layout_width="wrap_content" 3 android:layout_height="match_parent" 4 android:layout_gravity="center" 5 android:gravity="center" 6 android:orientation="vertical" 7 android:padding="10dp"> 8 9 <Button 10 android:id="@+id/request_permissions" 11 android:layout_width="match_parent" 12 android:layout_height="wrap_content" 13 android:onClick="onRequestPermissions" 14 android:text="@string/request_permissions" /> 15 16 <Button 17 android:id="@+id/revoke_permissions" 18 android:layout_width="match_parent" 19 android:layout_height="wrap_content" 20 android:onClick="onRevokePermissions" 21 android:text="@string/revoke_permissions" /> 22 23</LinearLayout>