Android中的广播和广播 * 代码实例

BroadcastReceiver不仅可以接收系统广播，也可接收自定义的广播
 
1.定义一个广播 *

public class MyReceiver extends BroadcastReceiver
{
         public MyReceiver()
         {
                   Log.i(TAG,"MyReceiver");
         }
       
         //可用Intent的getAction()区分接收到的不同广播
         @Override
         public void onReceive(Context arg0, Intent arg1)
         {
                   String action=intent.getAction();
                   //TO-DO LIST
         }
 
}

 
2.发送广播，定义好action标志，用Intent发送

//实例化该BroadcastReceiver
MyReceiver mReceiver=new MyReceiver();
//设置唯一action，用Intent发送
Intent intent=new Intent();
intent.setAction(str);
sendBroadcast(intent);

3.注册只接收指定action的广播 *

IntentFilter filter1=new IntentFilter();
filter1.addAction(str);
registerReceiver(mReceiver,filter1);

4.取消该广播 *

unregisterReceiver(mReceiver);