奥利奥和派的后台服务问题

Posted 2023-04-19

【中文标题】奥利奥和派的后台服务问题

【英文标题】：Background service issue in oreo and pie

【发布时间】：2020-02-14 05:11:47

【问题描述】：

基本上我想在后台发送纬度和经度，它在奥利奥版本下工作正常，但我被困在这部分。它工作得很好。我添加了一个后台 JobIntentService，它在 Oreo 和 pie 背景中运行良好，但是当我在 2 分钟后锁定屏幕时，它会禁用或停止向我的服务器发送位置。

public class LocationService extends JobIntentService implements LocationListener 

static final int JOB_ID = 1000; //Unique job ID.
RequestQueue requestQueue;
DBConnection con;
String Lat, Lng;
public static final int notify = 5000;  //interval between two services(Here Service run every 5 Minute)
private Handler mHandler = new Handler();   //run on another Thread to avoid crash
private Timer mTimer = null;
protected LocationManager locationManager;

@Override
public void onCreate() 
    super.onCreate();
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
   onGetLocation();
    if (mTimer != null) // Cancel if already existed
        mTimer.cancel();
    else
        mTimer = new Timer();   //recreate new
    mTimer.scheduleAtFixedRate(new LocationService.TimeDisplay(), 0, notify);   //Schedule task


public LocationService() 


public static void enqueueWork(Context context, Intent work) 
    enqueueWork(context, LocationService.class, JOB_ID, work);


@Override
protected void onHandleWork(@NonNull Intent intent) 
   UpdateLocation();


public void UpdateLocation()

    con = new DBConnection(LocationService.this);

    if(requestQueue==null) 
        requestQueue = Volley.newRequestQueue(getApplicationContext());
        requestQueue = Volley.newRequestQueue(getApplicationContext(), new StethoVolleyHurlStack());
    
    StringRequest request = new StringRequest(Request.Method.POST,
            "https://example.com/api/" + "updatelocation.php", new Response.Listener<String>() 
        @Override
        public void onResponse(String response) 
            Log.d("Response", response.toString() + " " + Lat.toString()+ " " + Lng.toString());
        
    , new Response.ErrorListener() 
        @Override
        public void onErrorResponse(VolleyError error) 
            Log.d("Response", error.toString());
        
    ) 
        @Override
        protected Map<String, String> getParams() throws AuthFailureError 
            Map<String, String> map = new HashMap<String, String>();
            map.put("userid", con.getusename());
            map.put("lat", Lat);
            map.put("lng", Lng);

            return map;
        
    ;

    requestQueue.add(request);

public void onGetLocation() 
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&      ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
        return;
    
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);


@Override
public void onLocationChanged(Location location) 

    Lng=String.valueOf(location.getLongitude());
    Lat=String.valueOf(location.getLatitude());


class TimeDisplay extends TimerTask 
    @Override
    public void run() 

        // run on another thread
        mHandler.post(new Runnable() 
            @Override
            public void run() 
                UpdateLocation();
            
        );
    

【问题讨论】：

请提供一点代码，以便对您的问题有更多了解。

@ViralPatel 请检查

希望对您有所帮助：***.com/a/49497032

您使用真机进行测试吗？一些制造商（例如华为）实施非常激进的后台执行策略。据我所知，除了在系统设置中为您的应用添加例外之外，没有其他方法可以解决此问题。

【参考方案1】：

是的，您需要在启动服务时添加通知

public class LocationService extends Service implements CallbackResponseListener, LocationListener 

public void onCreate() 
            super.onCreate();
        
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) 
            super.onStartCommand(intent, flags, startId);
            Log.e("Service Started", "onStartCommand!");
            createNotificationChannel();
            startTimer();
            return START_STICKY;
        
     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 = "Service channel";
                String description = "Service channel description";
                int importance = NotificationManager.IMPORTANCE_DEFAULT;
                NotificationChannel channel = new NotificationChannel("12", 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);
            
            Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);

            PendingIntent intent = PendingIntent.getActivity(getApplicationContext(), 0,
                    notificationIntent, 0);
            Notification notification = new NotificationCompat.Builder(this, "12")
                    .setContentTitle("Title")
                    .setContentText("App is running in background for location")
                    .setSmallIcon(R.drawable.notification_icon).setContentIntent(intent)
                    .build();
            startForeground(2001, notification);
        
        @Override
        public void onDestroy() 
            super.onDestroy();
            Log.e("Service EXIT", "ondestroy!");    
                Intent broadcastIntent = new Intent(getApplicationContext(), LocationBroadcastReceiver.class);
                sendBroadcast(broadcastIntent);

            stoptimertask();
        


        @Override
        public IBinder onBind(Intent intent) 
            return null;
        
     public void startTimer() 
            //set a new Timer
            try 
                timer = new Timer();   
                //initialize the TimerTask's job
                initializeTimerTask(); 
                //schedule the timer, to wake up every 1 second
                timer.schedule(timerTask, AppConstants.bgTaskStartDelay,2000); //
             catch (Exception e) 
                e.printStackTrace();
            
        
 /**
     * it sets the timer to print the counter every x seconds
     */
    public void initializeTimerTask() 
        timerTask = new TimerTask() 
            public void run() 
                try 
                    // add your code here for schedule




                 catch (Exception e) 
                    e.printStackTrace();
                
            
        ;
    

【讨论】：

通知也在 2 分钟后停止。

然后您可以尝试使用简单的服务扩展您的课程，这对我来说很好

感谢您的努力我昨天已经做了同样的事情它有效！谢谢