Overlapping Two Views,使一张图在另一张图的上面.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<!-- Back view should be first to be drawn first! -->
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:src="@drawable/back_image_beach"
/>
<!-- Front view should be last to be drawn on top! -->
<!-- Use `centerInParent` to center the image in the container -->
<!-- Use `elevation` to ensure placement on top (not required) -->
<ImageView
android:layout_width="250dp"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:elevation="10dp"
android:layout_centerInParent="true"
android:scaleType="fitXY"
android:src="@drawable/airbnb_logo_front"
/>
</RelativeLayout>
myView.bringToFront();
myView.invalidate();