Question

我有一个使用3个前台服务通过BluetoothLeScanner扫描和处理信标的应用程序。其中只有一个具有扫描它们的代码，其他两个服务则处理扫描的信标并进行一些api调用。几个小时后，前台服务停止工作，并且通知消失。

通过ScanCallback onScanResult进行扫描。每5分钟重新启动一次扫描，以避免Android停止扫描。

我使用START_STICKY运行前台服务。我已经制作了一个广播接收器，该广播接收器在调用onDestroy（）方法时重新启动服务。

 @Override
    public void onCreate() {
        Log.i("EntryDetectionService", "Starting Service");
        super.onCreate();
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String CHANNEL_ID = "Beacon Reader";
            String CHANNEL_NAME = "Scanning Beacons";

            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
            ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);

            Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
                    .setCategory(Notification.CATEGORY_SERVICE).setPriority(PRIORITY_HIGH)
                    .setSmallIcon(R.drawable.ic_launcher)
                    .build();

            startForeground(101, notification);
        }
    }

  @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        this.getBluetoothScanner();
        mainLoopHandler.post(scan);

        return START_STICKY;
    }

    ScanSettings settings = new ScanSettings.Builder()
                .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
                .build();

    List<ScanFilter> filters = new ArrayList<>();
    ScanFilter filter = new ScanFilter.Builder()
             .setManufacturerData(76, new byte[] {})
             .build();
     filters.add(filter);

     if (bluetoothAdapter.isEnabled())
         bleScanner.startScan(filters, settings, scanCallback);

谢谢！

Answer 1

使APP保持活动状态当api> 21时，您可以使用 JobScheduler

某些设备可能会使应用保持活动状态。

jobScheduler android example code

onStartJob 时检查服务是否仍然存在

public boolean isServiceRunning(Context context, String serviceName) {
        boolean isRunning = false;
        ActivityManager am = (ActivityManager) this
            .getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> lists = am.getRunningAppProcesses();

        for (ActivityManager.RunningAppProcessInfo info : lists) {
            System.out.println(info.processName);
            if (info.processName.equals(serviceName)) {
                isRunning = true;
            }
        }
        return isRunning;

    }

几个小时后停止前台服务

1 个答案: