点击和获得焦点时在xml中实现背景色的变化

<?xml version="1.0" encoding="UTF-8"?>   <selector xmlns:android="http://schemas.android.com/apk/res/android">   <item   android:state_pressed="false"   android:drawable="@drawable/org" />   <item   android:state_pressed="true"   android:drawable="@drawable/orgpressed" />   <item   android:state_focused="true"   android:drawable="@drawable/orgfocused" />   </selector>