android学习笔记之六广播(BroadcastReceiver)

用于接收外部事件(注意BroadcastReceiver是用时创建用完后即摧毁的)
 1,获取
   a,注册 Context.registerReceiver (BroadcastReceiver receiver, IntentFilter filter)
     receiver 为获取BroadcastReceiver事件的类
     filter   事件过滤器为sendBroadcast中的intent
     与之对应的Context.unregisterReceiver (BroadcastReceiver receiver)

     或在<application>节内添加
     <receiver android:name=".接收事件BoardCastReceiver类">
  <intent-filter android:name="要接受的事件">
  </intent-filter>
     </receiver>
   b,继承该类须实现 public void onReceive(Context context, Intent intent)方法

 2,产生
   Context.sendBroadcast
   如果传入的参数是Intent(name)那么name应该等于<intent-filter android:name="要接受的事件">