Why does my LocationListener become null?

Question

I am having issues regarding a LocationListener in my Service called myService.

Here is my code:

///onStart method ..
onStart() {
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE)
    .
    .
    provider = locationManager.getBestProvider(criteria, true);
    locationListener = (LocationListener) new MyLocationListener();
    locationManager.requestLocationUpdates(provider, 0, 0, locationListener);
}

In my Activity there is a button which should stop the service. On the click of the button I am doing:

stopService(new Intent(getApplicationContext(), myService.class)

In the myService.java file I have:

////onDestroy method....
onDestroy() {
    locationManager=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
    locationManager.removeUpdates(locationListener); //Getting **exception here ....
}

I get the following Exception:

java.lang.IllegalArgumentException: listener==null at android.location.LocationManager.removeUpdates(LocationManager.java:799) at 
<.package_name>myService.onDestroy(myService.java:407) 

I don't know why listener turns null without reason. Please can you tell me where I am going wrong!

Answer 1

I could be off here, but it seems like maybe your Service is being killed then (later) restarted. Why not move the instantiation stuff into onCreate()?