Android中的广播和广播接收器代码实例

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

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的广播接收器

intentfilter filter1=new intentfilter();
filter1.addaction(str);
registerreceiver(mreceiver,filter1);

4.取消该广播接收器

unregisterreceiver(mreceiver);