安卓动画点击呈现水波效果

安卓5.0以下的版本实现

recycler_view_background.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_pressed="true" >
    <shape android:shape="rectangle">
      <solid android:color="#cfd8dc"></solid>
    </shape>
  </item>
</selector>

5.0以上的版本实现为(ripple是5.0以上的版本新出现的，对于该图片应该放置在drawable-v21的文件夹下)

recycler_view_background.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
  android:color="#cfd8dc">
  <item android:drawable="@drawable/recycler_view_rectangle"/>
</ripple>

recycler_view_rectangle.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle">
  <solid android:color="#FFFFFF" />
</shape>