android java通知未显示

这是我第一次处理通知，但我似乎无法解决这个问题。
我想做的是：
简言之，我有一个服务，可以检查firebase文档中的变量，如果是真的，则显示一个通知。在你说之前，我不能在这个场景中使用云函数。我会详细解释的，请耐心听我说，谢谢。
发生了什么事
根据我的日志，我对正在发生的事情有了一个想法，让我用几点来总结一下。
作业计划程序每30分钟运行一次服务。这是“作业已启动”日志。
它调用checkbookings函数来检查上述变量，即“checkbookings”、“true”和“false”日志。
最后一个日志是“添加通知”，它位于我构建通知的addNotification函数中。此日志显示在“真”日志之后。
问题
已调用添加通知，但未显示该通知。

我会将日志、相关代码粘贴到下面，如有任何意见或建议，将不胜感激，谢谢
日志

D/Notification Service: Job started
D/Notification Service: Check Bookings
D/Notification Service: Job finished
D/Notification Service: true
D/Notification Service: Check Bookings On Success
D/Notification Service: Add Notification
D/Notification Service: Job started
D/Notification Service: Check Bookings
D/Notification Service: false
D/Notification Service: Job finished
D/Notification Service: Job started
D/Notification Service: Check Bookings
D/Notification Service: true
    Check Bookings On Success
    Add Notification
D/Notification Service: Job finished
W/ample.rehnseha: Accessing hidden method Ldalvik/system/CloseGuard;->close()V (greylist,core-platform-api, linking, allowed)
D/Notification Service: Job started
D/Notification Service: Check Bookings
D/Notification Service: false
D/Notification Service: Job finished

代码

private void doBackgroundWork(final JobParameters params) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                checkBookings();
                if (jobCancelled) {
                    return;
                }
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                Log.d(TAG, "Job finished");
                jobFinished(params, true);
            }
        }).start();
    }

    public void checkBookings(){
        String userId = FirebaseAuth.getInstance().getCurrentUser().getUid();
        Log.d(TAG,"Check Bookings");
        FirebaseFirestore.getInstance().collection("users").document(userId).get()
                .addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
                    @Override
                    public void onSuccess(DocumentSnapshot documentSnapshot) {
                        Log.d(TAG,""+documentSnapshot.get("notification"));
                        if ((boolean) documentSnapshot.get("notification")){
                            Log.d(TAG,"Check Bookings On Success");
                            addNotification();
                        }
                    }
                });
    }

    private void addNotification() {
        Log.d(TAG,"Add Notification");
        NotificationCompat.Builder builder =
                new NotificationCompat.Builder(this, NotificationChannel.DEFAULT_CHANNEL_ID)
                        .setSmallIcon(R.drawable.ic_launcher_foreground)
                        .setContentTitle("New Booking!")
                        .setAutoCancel(true)
                        .setContentText("One of your properties was booked recently, Respond Now!");

        Intent notificationIntent = new Intent(this, AddProperty.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(contentIntent);

        // Add as notification
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(0, builder.build());
        FirebaseFirestore.getInstance().collection("users").document(FirebaseAuth.getInstance().getCurrentUser().getUid())
                .update("notification",false);
    }

如果你需要更多的细节，请告诉我

当您想要创建通知时，首先需要为其创建一个通道。以下是一个例子：

private void createNotificationChannel() {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        CharSequence name = CHANNEL_NAME;
        String description = CHANNEL_DESC;
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
        channel.setDescription(description);
        // Register the channel with the system; you can't change the importance
        // or other notification behaviors after this
        NotificationManager notificationManager = getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }
}

在此之后，您可以调用添加通知：

private void addNotification() {
    Log.d(TAG,"Add Notification");
    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(this, CHANNEL_ID)
                    .setSmallIcon(R.drawable.ic_launcher_foreground)
                    .setContentTitle("New Booking!")
                    .setAutoCancel(true)
                    .setContentText("One of your properties was booked recently, Respond Now!");

    Intent notificationIntent = new Intent(this, AddProperty.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);

    // Add as notification
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
    FirebaseFirestore.getInstance().collection("users").document(FirebaseAuth.getInstance().getCurrentUser().getUid())
            .update("notification",false);
}

这应该行得通

android java通知未显示

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