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

android:src="@drawable/youPicture"
android:background="@drawable/my"

<?xml version="1.0" encoding="utf-8" ?>   
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
 <!-- 默認(rèn)時的背景圖片 -->  
 <item android:drawable="@drawable/pic1" /> 
 <!-- 沒有焦點時的背景圖片 -->  
 <item android:state_window_focused="false"  
    android:drawable="@drawable/pic1" />   
 <!-- 非觸摸模式下獲得焦點并單擊時的背景圖片 -->  
 <item android:state_focused="true" android:state_pressed="true"   
    android:drawable= "@drawable/pic2" />  
 <!-- 觸摸模式下單擊時的背景圖片 -->  
 <item android:state_focused="false" android:state_pressed="true"   
    android:drawable="@drawable/pic3" />   
 <!--選中時的圖片背景 -->  
 <item android:state_selected="true"   
    android:drawable="@drawable/pic4" />   
 <!--獲得焦點時的圖片背景 -->  
 <item android:state_focused="true"   
    android:drawable="@drawable/pic5" />   
</selector>

Drawable drawable = getResources().getDrawable(R.drawable.list_item_bg);
listview.setSelector(drawable);