android--廣播Broadcast【十三】

標籤：broadcastreceiver   broadcast   android   

廣播（Broadcast）是在組件之間傳播資料（Intent）的一種機制；這些組件甚至是可以位於不同的進程中，起到處理序間通訊的作用，主要是用於通知方面的.，下面要建立一個該例子的demo.

1.先定義一下通知廣播的訊息標識

private String MSG_BROADCAST = "MSG_BROADCAST";

2.廣播監聽以及處理廣播訊息

private void listen() {IntentFilter filter = new IntentFilter();filter.addAction(MSG_BROADCAST);MainActivity.this.registerReceiver(receiver, filter);}private BroadcastReceiver receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (MSG_BROADCAST.equals(action)) {Log.i(TAG,"recv msg");}}};

3.廣播監聽停止

private void stopListen() {MainActivity.this.unregisterReceiver(receiver);}

4.分別在onResume和onPause事件裡面調用

@Overridepublic void onResume() {super.onResume();listen();}@Overridepublic void onPause() {super.onPause();stopListen();}

5.測試發廣播

btn = (Button) this.findViewById(R.id.button1);btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Log.i(TAG, "btn click start ");Intent intent = new Intent(MSG_BROADCAST);intent.putExtra("message", "test");// 參數sendBroadcast(intent);}});

android--廣播Broadcast【十三】