Android中的廣播使用

afxstarx發表於2018-09-09
Android
Android中的廣播使用小結

(1)實現一個動態廣播接收器

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        abortBroadcast();
    }
}複製程式碼

intentFilter = new IntentFilter();
intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
myBroadcastReceiver = new MyBroadcastReceiver();
registerReceiver(myBroadcastReceiver, intentFilter);複製程式碼

(2)實現一個靜態廣播接收器

<receiver
     android:name=".MyBroadcastReceiver"
     android:enabled="true"
     android:exported="true">
     <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
     </intent-filter>
</receiver>複製程式碼

(3)傳送廣播

Intent intent = new Intent("android.net.conn.CONNECTIVITY_CHANGE");
sendBroadcast(intent); // 傳送廣播複製程式碼

(4)登出廣播
unregisterReceiver(myBroadcastReceiver);

分析：從使用上來看，需要分析一下BroadcastReceiver和IntentFilter原始碼，需要分析函式ContextImpl.registerReceiver和ContextImpl.sendBroadcast以及ContextImpl.unregisterReceiver原始碼。
  • A.BroadcastReceiver
  • B.IntentFilter
  • C.ContextImpl.registerReceiver
  • D.ContextImpl.sendBroadcast
  • E.ContextImpl.unregisterReceiver


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