lint/cli/src/test/java/com/android/tools/lint/checks/data/res/layout/useless.xml

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

    <!-- Neither parent nor child define background: delete is okay -->

    <FrameLayout
        android:id="@+id/LinearLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </FrameLayout>

    <!-- Both define background: cannot be deleted -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/bg" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </FrameLayout>

    <!-- Only child defines background: delete is okay -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </FrameLayout>

    <!-- Only parent defines background: delete is okay -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/bg" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </FrameLayout>

    <!-- Leaf cannot be deleted because it has a background -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/bg" >
    </FrameLayout>

    <!-- Useless leaf -->

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>
</merge>