pass broadcast from the Service class to the Map activity.

[Alex Ardoin]

Hello,

I have TrackingService component to track the location of the buses in my city based on Crowdsourcing. In the TrackingService class I have variable `pLong, pLat` to stored the latitude and longitude when they are calaculated in the `onLocatiochChanged()`. The TrackingService is operating in the background, then the data is transmitted to the server. I have an Map Activity to display the location of the buses, the user selected in the MainActivity( as Filter).

The background TrackingService is started in the MainActivity when the app launches.

I am trying to pass the `pLat, pLong` from the `onLocationChanged()` to the `Map` activity when the `onLocationChanged()`is being invoked to display the user's current location beside the bus's locations with the aid of BroadcastReceiver.

I have debugged my code and facing problem that I am getting `0.0` for the values `lat, lng` in the BroadcastReiceiver in the `map` activity also the `bReceiver` is being invoked.


How can I get it to work to retrieve the lat and lng vlaues in the BroadcastReceiver `bReceiver`?


I appreciate any help.

TrackingService class

   public class TrackingService extends Service implements
    		LocationListener {
    	public double pLong;
    	public double pLat;
        ...
        	@Override
    	public int onStartCommand(Intent intent, int flags, int startId) {
    		detectLocation();
    		return START_STICKY;
    	}
    	private void detectLocation() {
    		lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    		lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 30 * 1000, 0,
    				this);
    	}
    	@Override
    	public void onLocationChanged(Location location) {
    
    		if (location != null) {
			pLong = location.getLongitude();
			pLat = location.getLatitude();
			
			Intent intent = new Intent(Map.RECEIVE_latLng);
			Bundle extras = new Bundle();
			extras.putDouble("lng", pLong);
			extras.putDouble("lat", pLat);
			intent.putExtras(extras);
			LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
            System.out.println("ABC TrackingService: "+ pLat + " ; " + pLong);
               .....
    
         }	
    
    }


    

Map activity

       public class Map extends FragmentActivity implements OnMapReadyCallback   {
        public static final String RECEIVE_latLng = "com.bustracker.RECEIVE_latLng";
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.map);
    		
    		LocalBroadcastManager bManager = LocalBroadcastManager.getInstance(this);
    		IntentFilter intentFilter = new IntentFilter();
    		intentFilter.addAction(RECEIVE_latLng);
    		bManager.registerReceiver(bReceiver, intentFilter);
    
    	}
    

    	private BroadcastReceiver bReceiver = new BroadcastReceiver() {
    	    @Override
    	    public void onReceive(Context context, Intent intent) {
    	        if(intent.getAction().equals(RECEIVE_latLng)) {
    	   		 Bundle extras = getIntent().getExtras();
    	   		 if(!extras.isEmpty() && extras != null){
    				 double lng = extras.getDouble("lng");
    				 double lat = extras.getDouble("lat");
    			   	 LatLng ll = new LatLng(lat, lng);
    				 MarkerOptions markerOpt = new MarkerOptions().title("My Location")
    							.position(ll);
    				 System.out.println("ABC map: "+ lat + " ; " + lng);
    				 myLocatMarker = map.addMarker(markerOpt);
    	   			 
    	   		 }
    	        }
    	    }
    	};
    
    
        
          }


      

output:

   08-27 15:25:48.116: I/System.out(3260): ABC TrackingService: 63.86896885 ; 13.66557022
    08-27 15:25:48.146: I/System.out(3260): ABC map: 0.0 ; 0.0