android statelistdrawable基本设置

在drawable文件夹里，创建：

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_checked="true" android:drawable="@drawable/checked"/>    <item android:state_focused="true" android:drawable="@drawable/focus"/>    <item android:state_pressed="true" android:drawable="@drawable/pressed"/></selector>