sdk/platforms/android-27/data/res/layout/notification_intruder_content.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="4dp"
    >
    <ImageView android:id="@+id/icon"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:scaleType="center"
        android:padding="4dp"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_marginStart="40dp"
        android:orientation="vertical"
        >
        <TextView android:id="@+id/title"
            android:textAppearance="@style/TextAppearance.StatusBar.EventContent.Title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal"
            />
        <TextView android:id="@+id/text"
            android:textAppearance="@style/TextAppearance.StatusBar.EventContent"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginTop="-4dp"
            android:singleLine="true"
            android:ellipsize="marquee"
            android:fadingEdge="horizontal"
            />
    </LinearLayout>
    <LinearLayout
        android:id="@+id/actions"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:orientation="horizontal"
        android:visibility="gone"
        >
        <Button
            style="?android:attr/buttonBarButtonStyle"
            android:textAppearance="@style/TextAppearance.StatusBar.EventContent.Title"
            android:id="@+id/action0"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:visibility="gone"
            />
        <Button
            style="?android:attr/buttonBarButtonStyle"
            android:textAppearance="@style/TextAppearance.StatusBar.EventContent.Title"
            android:id="@+id/action1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:visibility="gone"
            />
        <Button
            style="?android:attr/buttonBarButtonStyle"
            android:textAppearance="@style/TextAppearance.StatusBar.EventContent.Title"
            android:id="@+id/action2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:visibility="gone"
            />
    </LinearLayout>
</FrameLayout>