Actually, just because something is a background service does NOT mean it is running in a different thread.
Background services run in the main thread. I suspect that this point of confusion may be involved in your problem, though I don't quite spot the problem. Also, you have a handler there that basically loops forever. That's kind of an oxymoron. If you're going to do that, why involve a handler at all? If I parse it correctly, it's not the main thread it'll be blocking, but still... if something in that thread is posting via that thread's looper rather than the context, that won't be processed. Finally, never, ever, call getApplicationContext(). The return value is not useful to us mortals. Supply the service itself as the context. To make things maximally confusing, getApplicationContext() will appear to work in most circumstances. But it's always the wrong way to get a context to use. On Apr 17, 2:05 pm, Tejas <[email protected]> wrote: > Ah... I got this working. Still I'm not sure of the reason for this > (some thread issue I suppose) It would be great if someone can throw > some light on this. > > I was instantiating the sensor class in a background service.So the > thread in which it was running was different than the main thread. > I was doing something like this: > > public class ManagerService extends Service { > > private final String LTAG = this.getClass().getName(); > private volatile Looper mServiceLooper; > private volatile ServiceHandler mServiceHandler; > > private final class ServiceHandler extends Handler{ > public ServiceHandler(Looper myLooper) { > super(myLooper); > } > > public void handleMessage(Message msg) { > Log.v(LTAG, "handleMessage Called"); > super.handleMessage(msg); > > // Class Instantiation > GPSSensor gs = new GPSSensor(); > gs.setContext(getApplicationContext()); > gs.startSensing() > > // Main service loop > while(CARuntimes.MainServiceRunFlag == true){ > Log.v(LTAG, "In service Loop"); > // Do something > > SystemClock.sleep(60000); > > }//while > > } > } > > public void onCreate() { > super.onCreate(); > HandlerThread myThread = new HandlerThread("Main Service > Thread"); > myThread.start(); > > mServiceLooper = myThread.getLooper(); > mServiceHandler = new ServiceHandler(mServiceLooper); > } > > public void onStart(Intent intent, int startId) { > super.onStart(intent, startId); > > Message msg = mServiceHandler.obtainMessage(); > //msg.obj = blah blah > mServiceHandler.sendMessage(msg); > > } > > public void onDestroy() { > Log.v(LTAG, "onDestroy called, quitting looper"); > super.onDestroy(); > > mServiceLooper.quit(); > } > > public IBinder onBind(Intent arg0) { > return null; > } > > } > > So, I was instantiating the GPSSensor in the handleMessage method. I > moved this to the onStart method and it started working. > I'm not sure why it wasn't working earlier and now has started working > with this change. > It will be great if anyone can explain this. > > Cheers, > Tejas > > On Apr 17, 1:59 am, Tejas <[email protected]> wrote: > > > > > > > Hi, > > > My class listed below is not working. No idea whatsoever. The > > onLocationChanged method is never getting called ! > > I checked the logs for any errors/exceptions. I have the required > > permissions set (fine and course locations). > > I doubt the Context I'm setting from the caller. I'm using > > getApplicationContext() to pass to the setContext method in this > > class. > > Can anyone please help ? > > > public class GPSSensor implements CASensor { > > > private String LTAG = this.getClass().getName(); > > Context myContext; > > private String GPSData; > > public LocationManager lMgr; > > public LocationListener myLocListener = new LocationListener() { > > > public void onStatusChanged(String provider, int status, > > Bundle > > extras) { > > Log.v(LTAG, "=========== Here 1 ============"); > > } > > > public void onProviderEnabled(String provider) { > > Log.v(LTAG, "=========== Here 2 ============"); > > } > > > public void onProviderDisabled(String provider) { > > Log.v(LTAG, "=========== Here 3 ============"); > > } > > > public void onLocationChanged(Location location) { > > if (location != null){ > > GPSData = location.getLatitude() + "," + > > location.getLongitude(); > > Log.v(LTAG, "GPS data received ===========> > > " + GPSData); > > } > > else > > Log.v(LTAG, "Location is null ===========> > > "); > > } > > }; > > > public String getCurrentData() { > > return GPSData; > > } > > > public void setContext(Context context) { > > myContext = context; > > } > > > public boolean startSensing() { > > if (myContext == null){ > > Log.w(LTAG, "myContext not set"); > > return false; > > } > > Log.v(LTAG, "Starting location updates !"); > > > lMgr = (LocationManager) > > myContext.getSystemService(Context.LOCATION_SERVICE); > > lMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, > > 0, 0, > > myLocListener); > > > > //lMgr.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, > > 0, myLocListener); > > Log.v(LTAG, "Registered myLocListener for GPS"); > > return true; > > } > > > public boolean stopSensing() { > > if (myContext == null){ > > Log.w(LTAG, "myContext not set"); > > return false; > > } > > Log.v(LTAG, "Stopping location updates !"); > > lMgr.removeUpdates(myLocListener); > > return false; > > } > > > }//GPSSensor > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group > > athttp://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group > athttp://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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