title: Android service stops when I exit from application
body: <p>I have an application with a service. Service is started by app in the main activity on create method. My problem occurs  when I exit from application: service stops and sometimes restarts immediately, sometimes restarts lately. I tested in version 4.1.2 and version 2.3.6.  service does not again in version 2.3.6. Is my approach wrong? Between the stop and restart times, the call that must blocked can come. Is there any way to not stop the service when app is exited?
  Note: I cannot use a remote service.</p>
  
  <p>i added startForeground to service but the same problem. when i exit application the service stopped and not restart version 2.3.3 even i see notification.But phoneStateListener takes null value
  How can i ensure when i exit application, the service does not stop</p>
  
  <pre><code> //application main metod
  @Override
  protected void onCreate(Bundle savedInstanceState) {              
  //.....
  
      startService(new Intent(getApplicationContext(), MyPhoneStateListener.class));
  }
  
  
  
  
   @Override
   public int onStartCommand(Intent intent, int flags, int startId)
   {
      setCallListener();    
      setNoti();
      return START_STICKY;
   }
  
   private void setCallListener()
   {
          try
          {
              if (phoneStateListener==null)
              {
  
                phoneStateListener = new StateListener();
                telephonymanager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
                   telephonymanager.listen(phoneStateListener,PhoneStateListener.LISTEN_CALL_STATE);
              }
          }
          catch(Exception ex)
          { 
  
          }
      }
  </code></pre>
  
  <p>private void setNoti()
      {</p>
  
  <pre><code>    Notification notification= new Notification(R.drawable.ic_launcher,  getResources().getString(R.string.app_name), System.currentTimeMillis());
  
      Intent main = new Intent(this, MainActivity.class);
  
      main.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
  
      PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, main,  PendingIntent.FLAG_UPDATE_CURRENT);
  
      notification.setLatestEventInfo(this, getResources().getString(R.string.app_name), getResources().getStringArray(R.array.blockstate)[Sabitler.ShieldState].toString(), pendingIntent);
  
      notification.flags |= Notification.FLAG_FOREGROUND_SERVICE | Notification.FLAG_NO_CLEAR;
  
      startForeground(123456, notification);  
  }
  </code></pre>
  
  <p>i change the where setting callstatelistener from service to broadcast as Dhawal Sodha advised but in this case blocking unwanted call get slow. i think on broadcast TelephonyManager initializes every calling. Broadcast code below. When i use service,
  when main activity is exited service stopped in version 2.3.3. Any idea ? Broadcast or service ? How can make broadcast faster? every calling  variables and object initialize again in broadcast. </p>
  
  <pre><code>public class PhoneStateBroadcastReceiver extends BroadcastReceiver{
  
      MyCustomStateListener myCustomStateListener;
      TelephonyManager telephonymanager;
      @Override
      public void onReceive(Context context, Intent intent) 
      {
          try
          {
              //Log.e("receiver1",String.valueOf(System.currentTimeMillis()));
  
              telephonymanager = (TelephonyManager) context.getSystemService(context.TELEPHONY_SERVICE);
              myCustomStateListener = new MyCustomStateListener(context,telephonymanager);
              telephonymanager.listen(myCustomStateListener, PhoneStateListener.LISTEN_CALL_STATE);
              //Log.e("receiver2",String.valueOf(System.currentTimeMillis()));
              telephonymanager.listen(myCustomStateListener, PhoneStateListener.LISTEN_NONE);
          }
          catch(Exception ex)
          { 
              Toast.makeText(context,"setCallListener:"+ex.toString(), Toast.LENGTH_SHORT).show();
          }
      }   
  }
  </code></pre>