Android中的廣播和廣播接收器代碼實例

BroadcastReceiver不僅可以接收系統廣播，也可接收自定義的廣播
 
1.定義一個廣播接收器
復制代碼 代碼如下:
public class MyReceiver extends BroadcastReceiver
{
         public MyReceiver()
         {
                   Log.i(TAG,"MyReceiver");
         }
       
         //可用Intent的getAction()區分接收到的不同廣播
         @Override
         public void onReceive(Context arg0, Intent arg1)
         {
                   String action=intent.getAction();
                   //TO-DO LIST
         }
 
}

 
2.發送廣播，定義好action標志，用Intent發送
復制代碼 代碼如下:
//實例化該BroadcastReceiver
MyReceiver mReceiver=new MyReceiver();
//設置唯一action，用Intent發送
Intent intent=new Intent();
intent.setAction(str);
sendBroadcast(intent);

3.注冊只接收指定action的廣播接收器
復制代碼 代碼如下:
IntentFilter filter1=new IntentFilter();
filter1.addAction(str);
registerReceiver(mReceiver,filter1);

4.取消該廣播接收器
復制代碼 代碼如下:
unregisterReceiver(mReceiver);