Android Selector全解

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 xml version="1.0" encoding="utf-8" ?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_focused="true"
 android:state_window_focused="true"
 android:state_enabled="true"
 android:state_checkable="true"
 android:state_checked="true"
 android:state_selected="true"
 android:state_pressed="true"
 android:state_activated="true"
 android:state_active="true"
 android:state_single="true"
 android:state_first="true"
 android:state_middle="true"
 android:state_last="true"
 android:state_accelerated="true"
 android:state_hovered="true"
 android:state_drag_hovered="true"
  android:state_drag_can_accept="true"
 android:state_accessibility_focused="true"
 android:drawable="@drawable/icon"
  />
   selector>

接下来，给出部分使用场景

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

   <item android:drawable="@drawable/pic1" />

   <item android:state_window_focused="false"
         android:drawable="@drawable/pic1" />

   <item android:state_focused="true" android:state_pressed="true"   android:drawable= "@drawable/pic2" />

 <item android:state_focused="false" android:state_pressed="true"   android:drawable="@drawable/pic3" />

   <item android:state_selected="true"   android:drawable="@drawable/pic4" />

   <item android:state_focused="true"   android:drawable="@drawable/pic5" />
 selector>

当然我们也可以这样

 "1.0" encoding="utf-8"?>

 "http://schemas.android.com/apk/res/android">

     "true" android:color="#FF0000" />

     "true" android:color="#00FF00" />

     "true" android:color="#0000FF" />

     "#000000" />

或者这样

 xml version="1.0" encoding="utf-8"?>

 <selector xmlns:android="http://schemas.android.com/apk/res/android">

     <item android:state_pressed="true">



         <shape>

             <gradient android:startColor="#8600ff" />

             <stroke android:width="2dp" android:color="#000000" />

             <corners android:radius="5dp" />

             <padding android:left="10dp" android:top="10dp"

                 android:bottom="10dp" android:right="10dp" />

         shape>

     item>

     <item android:state_focused="true">



         <shape>

             <gradient android:startColor="#eac100" />

             <stroke android:width="2dp" android:color="#333333" color="#ffffff" />

             <corners android:radius="8dp" />

             <padding android:left="10dp" android:top="10dp"

                 android:bottom="10dp" android:right="10dp" />

         shape>

     item>
     <item android:drawable="@drawable/you_picture_name">默认背景item>
 selector>

这里我们给出重点提醒selector  一般用于background

不要忘记

 android:background="@drawable/you_drawable_xml_name"