mxl方法改变button的未选中、选中、点击时的图片

在drawable里增加一个：button_focus_change.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 非触摸模式下获得焦点并单击时的背景图片 -->
    <item
        android:state_focused="true"
        android:drawable="@drawable/setup_button_select"
        android:color="@color/white" />
  <item
      android:state_selected="true"
       android:drawable="@drawable/setup_button_select"
       android:color="@color/white"/>
   
    <item
        android:state_focused="false"
        android:state_pressed="false"
        android:drawable="@drawable/setup_button_no_select"
        android:color="@color/white" />

</selector>
2、在布局的xxxx.xml中定义的button中应用 方法

 <Button
 android:id="@+id/bt3"
 android:layout_width="208px"
 android:layout_height="225px"
 android:layout_marginLeft="784px"
 android:layout_marginTop="404px"
 android:background="@drawable/button_focus_change"
  />