android中的广播

接收广播如下

 public class MyBroadcastReceiver extends BroadcastReceiver{

     @Override

   public void onReceive(Context context,Intent intent){

           String msg = intent.getExtras().getString("msg");

         .....

     }

}

<receiver android:name=".MyBroadcastReceiver">

   <Intent-filter>

      <action android:name="com.itcast.BroadcastReceiverTest"/>

     <category android:name="android.intent.category.DEFAULT"/>

</intent-filter>

</receiver>

发送广播

  Intent intent = new Intent();

intent.setAction("com.itcast.BroadcastReceiverTest");

intent.putExtra("msg");

sendBroadcast(intent);

//动态的创建广播过滤器

MyBroadcastReceiver receiver = new MyBroadcastReceiver();

IntentFilter filter = new IntentFilter();

filter.addAction("com.itcast.MyBroadcastReceiverTest");

registerReceiver(receiver,filter);

动态注册和静态注册的区别

 动态注册的广播为常驻型广播，那么他就跟随Activity的生命周期，所有Activity结束前，我么需要调用unregisterReceiver方法移出它

静态注册的广播为常驻型广播，也就是说如果应用程序关闭，有相应事件触发，程序还是被系统自动调用