通过自定义广播接收器传达两个活动

你可以传达两个活动，以便可以向活动 A 通知活动 B 中发生的事件。

活动 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
    }
};

活动 B.

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

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

当然，你可以向广播添加更多信息，为活动之间传递的 Intent 添加额外内容。未添加以保持示例尽可能简单。