xml 重叠两个视图，使一张图在另一张图的上面。

Posted 2021-05-17

myView.bringToFront();
myView.invalidate(); 

<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>