通過自定義廣播接收器傳達兩個活動

你可以傳達兩個活動，以便可以向活動 A 通知活動 B 中發生的事件。

活動 A.

final String eventName = "your.package.goes.here.EVENT";

@Override
protected void onCreate(Bundle savedInstanceState) {
    registerEventReceiver();
    super.onCreate(savedInstanceState);
}

@Override
protected void onDestroy() {
    unregisterEventReceiver(eventReceiver);
    super.onDestroy();
}

private void registerEventReceiver() {
    IntentFilter eventFilter = new IntentFilter();
    eventFilter.addAction(eventName);
    registerReceiver(eventReceiver, eventFilter);
}

private BroadcastReceiver eventReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
         //This code will be executed when the broadcast in activity B is launched
    }
};

活動 B.

final String eventName = "your.package.goes.here.EVENT";

private void launchEvent() {
    Intent eventIntent = new Intent(eventName);
    this.sendBroadcast(eventIntent);
}

當然，你可以向廣播新增更多資訊，為活動之間傳遞的 Intent 新增額外內容。未新增以保持示例儘可能簡單。