Android版本10中的警报管理器不显示通知

如何解决Android版本10中的警报管理器不显示通知

我在使用系统显示通知时遇到问题。该代码适用于Android版本9，但不适用于Android版本11。 在android 10中，它仅在打开应用程序时显示通知，这与android版本9不同。

Manifest.xml（在应用程序标记中）：

    <receiver
        android:name=".MainActivity$AlarmReceiver"
        android:enabled="true"
        tools:ignore="Instantiatable" />

    <service
        android:name=".MainActivity$NotificationService"
        android:enabled="true"
        tools:ignore="Instantiatable" />

这是警报的代码：

 public static class Utils {

        public static void setAlarm(int i,Long timestamp,Context ctx) {
            AlarmManager alarmManager = (AlarmManager) ctx.getSystemService(ALARM_SERVICE);
            Intent alarmIntent = new Intent(ctx,AlarmReceiver.class);
            PendingIntent pendingIntent;
            pendingIntent = PendingIntent.getbroadcast(ctx,i,alarmIntent,PendingIntent.FLAG_ONE_SHOT);
          //  alarmIntent.setData((Uri.parse("custom://" + System.currentTimeMillis())));
            alarmManager.set(AlarmManager.RTC_WAKEUP,timestamp,pendingIntent);
        }
}

 public static class AlarmReceiver extends broadcastReceiver {

        @Override
        public void onReceive(Context context,Intent intent) {
            Intent service1 = new Intent(context,NotificationService.class);
            service1.setData((Uri.parse("custom://" + System.currentTimeMillis())));
            ContextCompat.startForegroundService(context,service1 );    
        }
    }

    public static class NotificationService extends IntentService {

        private notificationmanager notificationmanager;
        private PendingIntent pendingIntent;
        private  int NOTIFICATION_ID = 1;
        Notification notification;


        public NotificationService(String name) {
            super(name);
        }

        public NotificationService() {
            super("SERVICE");
        }

        @TargetApi(Build.VERSION_CODES.O)
        @Override
        protected void onHandleIntent(Intent intent2) {
            String NOTIFICATION_CHANNEL_ID = getApplicationContext().getString(R.string.app_name);
            Context context = this.getApplicationContext();
            notificationmanager = (notificationmanager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            Intent mIntent = new Intent(this,MainActivity.class);
            Resources res = this.getResources();
            Uri soundUri = ringtoneManager.getDefaultUri(ringtoneManager.TYPE_ALARM);

            String message = getString(R.string.new_notification);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                final int NOTIFY_ID = 0; // ID of notification
                String id = NOTIFICATION_CHANNEL_ID; // default_channel_id
                String title = NOTIFICATION_CHANNEL_ID; // Default Channel
                PendingIntent pendingIntent;
                NotificationCompat.Builder builder;
                notificationmanager notifManager = (notificationmanager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                if (notifManager == null) {
                    notifManager = (notificationmanager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                }
                int importance = notificationmanager.IMPORTANCE_HIGH;
                NotificationChannel mChannel = notifManager.getNotificationChannel(id);
                if (mChannel == null) {
                    mChannel = new NotificationChannel(id,title,importance);
                    mChannel.enableVibration(true);
                    mChannel.setVibrationPattern(new long[]{100,200,300,400,500,400});
                    notifManager.createNotificationChannel(mChannel);
                }
                builder = new NotificationCompat.Builder(context,id);
                mIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                pendingIntent = PendingIntent.getActivity(context,mIntent,PendingIntent.FLAG_UPDATE_CURRENT);
                builder.setContentTitle(getString(R.string.app_name)).setCategory(Notification.CATEGORY_SERVICE)
                        .setSmallIcon(R.drawable.ic_launcher_background)   // required
                        .setContentText(message)
                        .setLargeIcon(BitmapFactory.decodeResource(res,R.drawable.ic_launcher_background))
                        .setDefaults(Notification.DEFAULT_ALL)
                        .setAutoCancel(true)
                        .setSound(soundUri)

                        .setContentIntent(pendingIntent)
                        .setVibrate(new long[]{100,400});
                Notification notification = builder.build();
                notifManager.notify(NOTIFY_ID,notification);

                startForeground(10587,notification);

            } else {
                pendingIntent = PendingIntent.getActivity(context,1,PendingIntent.FLAG_UPDATE_CURRENT);
                notification = new NotificationCompat.Builder(this)
                        .setContentIntent(pendingIntent)
                        .setSmallIcon(R.drawable.ic_launcher_background)
                        .setLargeIcon(BitmapFactory.decodeResource(res,R.drawable.ic_launcher_background))
                        .setSound(soundUri)
                        .setAutoCancel(true)
                        .setContentTitle(getString(R.string.app_name)).setCategory(Notification.CATEGORY_SERVICE)
                        .setContentText(message).build();
                notificationmanager.notify(NOTIFICATION_ID,notification);
            }
        }
    }