android系统托盘中的通知，不工作

Question

我已经设置了接收通知的代码,但它不起作用：

                String ns = Context.NOTIFICATION_SERVICE;
                NotificationManager notificationManager = (NotificationManager) getSystemService(ns);
                int icon = R.drawable.messages_received;
                CharSequence contentTitle = "TITLE";
                Intent notificationIntent = new Intent(this, MainActivity.class);
                PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

                Context context = getApplicationContext();
                NotificationCompat.Builder builder = new NotificationCompat.Builder(context);

                Notification notification  = builder
                        .setContentIntent(contentIntent)
                        .setSmallIcon(icon)
                        .setWhen( System.currentTimeMillis())
                        .setContentTitle(contentTitle)
                        .setContentText(message.getMessage())
                        .build();

                notification.flags |= Notification.FLAG_AUTO_CANCEL;
                notification.defaults |= Notification.DEFAULT_SOUND;
                notification.defaults |= Notification.DEFAULT_VIBRATE;
                notification.defaults |= Notification.DEFAULT_LIGHTS;

                final int NOTIFY = 1;
                notificationManager.notify(NOTIFY, notification);

我用它在我的主要活动，我尝试了它，因为电话是待机。我该怎么解决？它需要其他代码吗？我遵循了以下指南:http://www.dre.vanderbilt.edu/~schmidt/android/android-4.0/out/target/common/docs/doc-comment-check/guide/topics/ui/notifiers/notifications.html

谢谢

Answer 1

 public static final String CHANNEL_ID = "com.example.test.services";
    public static final String CHANNEL_NAME = "UploadBackgroundService";
    public static final int FOREGROUND_ID = 1339;

private void createAndShowForegroundNotification() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            NotificationChannel chan = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_NONE);
            chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
            manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            assert manager != null;
            manager.createNotificationChannel(chan);

            notificationBuilder = new NotificationCompat.Builder(this, CHANNEL_ID);
            Notification notification = notificationBuilder
                    .setContentTitle("Image upload service")
                    .setContentText("Uploading Images...")
                    .setPriority(NotificationManager.IMPORTANCE_HIGH)
                    .setCategory(Notification.CATEGORY_SERVICE)
                    .setOngoing(true)
                    .setSmallIcon(R.drawable.logoo)
                    .setAutoCancel(false)
                    .build();
            startForeground(FOREGROUND_ID, notification);
        } else {
            notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID )
                    .setDefaults(Notification.DEFAULT_ALL)
                    .setPriority(NotificationCompat.PRIORITY_HIGH)
                    .setContentTitle("Image upload service")
                    .setContentText("Uploading Images...")
                    .setOngoing(true)
                    .setSmallIcon(R.drawable.logoo)
                    .setAutoCancel(false);
            Notification notification = notificationBuilder.build();
            startForeground(FOREGROUND_ID, notification);
        }
    }

请尝试此代码。用您自己的参数替换所需的参数。