android selectorの使用

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