Foreground method not working in Jellybean in Android

I have implemented a service for my chat app and the concept needs to be online and last visible just like whatsapp.

When I implemented an online app and last seen service for my app, and when I checked from lollipop to lollipop, it works 100% fine, but when I tested the same from jellybean to lollipop, it doesn't work anymore.

@Override
    protected void onStop() {
        super.onStop();

        if (Utils.isAppSentToBackground(getApplicationContext())) {

            // call web Service here
            // Log.e("Angel", "in back");
            Utils.setInBackGround(getApplicationContext(), true);
            callOnlineOfflineService("0");
        }
    }


// code for resume called
    @Override
    protected void onResume() {
        super.onResume();
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
        if (Utils.isInBackGround(getApplicationContext())) {
            // Log.e("Angel", "From back");

            Utils.setInBackGround(getApplicationContext(), false);
            callOnlineOfflineService("1");
        }
    }

      

        
        
        
      

    

Here Util is my generic class where I implemented the generic method and setInBackGround method set credentials for SessionManager.

void callOnlineOfflineService(String status) {

        Log.e("status:::::online", "status" +status);

        if(!myclass.isConnected(getApplicationContext())){
            errordialog(getResources().getString(R.string.no_internet));
            return;
        }

        final List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("mode", "setUserOnlineStatus"));
        params.add(new BasicNameValuePair("userId", uid));
        params.add(new BasicNameValuePair("status", status));

        Log.e("status:::::online", "status" +params);

            Runnable runnable = new Runnable() {
                public void run() { 

                    UserFunctions userFunction = new UserFunctions(getApplicationContext());
                    JSONObject json = userFunction.CommonObject(params);

                        try {

                            final String s = json.getString("status");
                            Log.e("status:::::online", "status" +s);

                        } catch (JSONException e) {
                            e.printStackTrace();
                             return;
                        }
                }
            };
            Thread mythread = new Thread(runnable);
            mythread.start();
    }

      

        
        
        
      

    

Your hard work and efforts will be highly appreciated and thankful in advance.