相关疑难解决方法(0)

我想在收到推送通知时自动打开应用程序。我已经尝试过，但它仍然无法按我的预期工作。下面的代码在应用程序处于活动状态或处于 MainActivity 中时有效，但当应用程序在后台或仅在托盘上显示通知时则不起作用。我错过了什么？

public class MyFirebaseMessagingService extends FirebaseMessagingService {

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    if (remoteMessage.getNotification() != null) {
        if (PreferencesUtil.getInstance(this).isLoggedIn()) {
            sendNotification(remoteMessage.getData().get("order_id"));
        }
    }

}


public void sendNotification(String messageBody) {
    NotificationManager notificationManager = null;
    notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationCompat.Builder notificationBuilder;

    notificationBuilder = new NotificationCompat.Builder(this)
            .setContentTitle("Notification")
            .setSmallIcon(R.mipmap.icon_notif)
            .setContentText(messageBody)
            .setPriority(NotificationCompat.PRIORITY_MAX)
            .setDefaults(Notification.DEFAULT_LIGHTS );
    //add sound
    try {
        Uri sound = Uri.parse("android.resource://" + this.getPackageName() + "/" + R.raw.siren);
        Ringtone ringtone = RingtoneManager.getRingtone(this, sound);
        ringtone.play();
        notificationBuilder.setSound(sound);
    } catch (Exception e) {
        e.printStackTrace();
    } …