ImageView 点击效果 selector 设置

1、图片点击后，效果存留

<selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_selected="true" android:drawable="@drawable/keyboard_selected" />    <item android:drawable="@drawable/keyboard_normal" /></selector>

2、图片点击时改变，抬起恢复

<selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/num_normal" android:state_pressed="false"/>    <item android:drawable="@drawable/num_selected" android:state_pressed="true"/></selector>