how to animate one item of layer-list

Question

I have a layer list object, it contain two images, one is background, and the other is a rotation disk image which will be raotated at the top of the background image. i.e. I u

Answer 1

First create 2(or more) layer-list resources ie *layer_frame1.xml* and *layer_frame2.xml* , where you set your frames. In your case let's say changing the android:top of the disk item.

Then create an animation-list resource where you set the timing and order of the frames :

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false">

    <item
        android:drawable="@drawable/layer_frame1"
        android:duration="100"/>
    <item
        android:drawable="@drawable/layer_frame2"
        android:duration="100"/>

</animation-list>

Save it in a file ie *drawable/player_animation.xml* and set it as background on a View

<View
        android:id="@+id/animation_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/player_animation" />

Finally in your code just say when you want the animation start.

 ((AnimationDrawable)findViewById(R.id.animation_test).getBackground()).start();

Watch out do not start the animation inside onCreate() method.