Why isn't Android's onProviderEnabled() method being called?

Question

My Android app has two location listeners, one for fine and one for coarse listening. I want to be able to detect when the user turns their location services off and on.

Whenever I turn my phones GPS or network location services OFF the onProviderDisabled method is called as expected. When I turn GPS or network services ON the onProviderEnabled is never called!

I have put the code for one of the listeners below....

Update...

I have discovered that the problem is related to unregistering the listeners in onPause. When I remove the code "locationManager.removeUpdates(myFineLocationListener);" the onProviderEnabled() method IS called.

Perhaps the act of disabling the (say) GPS automatically unregisters the listener? Perhaps I should unregister thje listener in onDestroy rather than onPause() ???

PS. Maybe it is relevant that I mention that my activity has a button that goes directly to the devices location settings page. It acts as a shortcut. I use this shortcut to disable/enable location services then use the Back button to return to my app. I will put the code for this button at the very end of this post.

Code:

(The createLocListeners() method is called from onCreate();)

 void createLocListeners() {

        //if null, create a new listener
        //myFineLocationListener is a class variable     
        if (myFineLocationListener == null) {

        //Listen for FINE location updates   
                myFineLocationListener = new LocationListener(){

                    @Override
                    public void onLocationChanged(Location location) {
                        //Do something
                    }

                    @Override
                    public void onProviderDisabled(String provider) {   
                                 //This gets called when I change location settings (eg GPS on or off)  on the phone            }



                                  @Override
                           public void onProviderEnabled(String provider) {
                                  //This DOES NOT get called when I change location settings (eg GPS on or off)  on the phone   
                           }

                    @Override
                    public void onStatusChanged(String provider, int status, Bundle extras) {   
                    }

                };  //end on location listener
        } //end if fine listener is null

    } //end createLocListener() function






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

        //REGISTER LOCATION LISTENERS
        try {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LISTENING_INTERVAL, LISTENING_DISTANCE, myFineLocationListener);
        } 
        catch (IllegalArgumentException e){
        //Tried catching exceptions but there weren't any
        }         
        catch (RuntimeException e) {            
        }





    }// end onResume()




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

        //UNREGISTER LOCATION LISTENERS
        locationManager.removeUpdates(myFineLocationListener);

    } //end onPause

Similar problem: Location service onProviderEnabled never called

Code for button that opens the location Settings page...

        //JUMP TO LOCATION SERVICES SETTINGS
    ibLoc.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
        }

    }); //end jump to location services button listener

Answer 1

IMO, when you go to settings the onPause() is called and listeners are unregistered. Then you enable the GPS and return to your activity. So when you register the listeners the GPS is already enabled, so listener onProviderEnabled() is never called, since it is only called when GPS status is changed to enabled.

Answer 2

I had mLocationManager.removeUpdates(this) in onStop() which was getting called when I pulled down the Notification Tray to turn on the locations services. So though I turn on the locations, my onProviderEnabled() was not getting called. Thanks for the hint @Peter.