How to get data from service to activity

Question

In my app I have an activity and a service... The service will broadcast messages gathered from data from GPS... The Activity should receive the broadcast messages and update the UI...

my code

public class LocationPollerDemo extends Activity {     private static final int PERIOD = 10000; // 30 minutes     private PendingIntent pi = null;     private AlarmManager mgr = null;     private double lati;     private double longi;     private ServiceReceiver serviceReceiver;      @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          mgr = (AlarmManager) getSystemService(ALARM_SERVICE);          Intent i = new Intent(this, LocationPoller.class);          i.putExtra(LocationPoller.EXTRA_INTENT, new Intent(this, ServiceReceiver.class));         i.putExtra(LocationPoller.EXTRA_PROVIDER, LocationManager.GPS_PROVIDER);          pi = PendingIntent.getBroadcast(this, 0, i, 0);         mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), PERIOD, pi);          DebugLog.logTrace("On Create Demo");         Toast.makeText(this, "Location polling every 30 minutes begun", Toast.LENGTH_LONG).show();         serviceReceiver = new ServiceReceiver();         IntentFilter filter = new IntentFilter("me");         this.registerReceiver(serviceReceiver, filter);     }      class ServiceReceiver extends BroadcastReceiver {         @Override         public void onReceive(Context context, Intent intent) {             File log = new File(Environment.getExternalStorageDirectory(), "Location2.txt");             DebugLog.logTrace(Environment.getExternalStorageDirectory().getAbsolutePath());              try {                 BufferedWriter out = new BufferedWriter(new FileWriter(log.getAbsolutePath(), log.exists()));                  out.write(new Date().toString());                 out.write(" : ");                  Bundle b = intent.getExtras();                 Location loc = (Location) b.get(LocationPoller.EXTRA_LOCATION);                 String msg;                  if (loc == null) {                     loc = (Location) b.get(LocationPoller.EXTRA_LASTKNOWN);                      if (loc == null) {                         msg = intent.getStringExtra(LocationPoller.EXTRA_ERROR);                     } else {                         msg = "TIMEOUT, lastKnown=" + loc.toString();                     }                 } else {                     msg = loc.toString();                 }                  if (msg == null) {                     msg = "Invalid broadcast received!";                 }                  out.write(msg);                 out.write("\n");                 out.close();             } catch (IOException e) {                 Log.e(getClass().getName(), "Exception appending to log file", e);                 DebugLog.logException(e);             }         }     } } 

When I use this code it is not working properly... I am using ServiceReceiver class in separate file works fine.... please tell me...!!

Answer 1

In my Service class I wrote this

private static void sendMessageToActivity(Location l, String msg) {     Intent intent = new Intent("GPSLocationUpdates");     // You can also include some extra data.     intent.putExtra("Status", msg);     Bundle b = new Bundle();     b.putParcelable("Location", l);     intent.putExtra("Location", b);     LocalBroadcastManager.getInstance(context).sendBroadcast(intent); } 

and at the Activity side we have to receive this Broadcast message

LocalBroadcastManager.getInstance(getActivity()).registerReceiver(             mMessageReceiver, new IntentFilter("GPSLocationUpdates")); 

By this way you can send message to an Activity. here mMessageReceiver is the class in that class you will perform what ever you want....

in my code I did this....

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {     @Override     public void onReceive(Context context, Intent intent) {         // Get extra data included in the Intent         String message = intent.getStringExtra("Status");         Bundle b = intent.getBundleExtra("Location");         lastKnownLoc = (Location) b.getParcelable("Location");         if (lastKnownLoc != null) {             tvLatitude.setText(String.valueOf(lastKnownLoc.getLatitude()));             tvLongitude                     .setText(String.valueOf(lastKnownLoc.getLongitude()));             tvAccuracy.setText(String.valueOf(lastKnownLoc.getAccuracy()));             tvTimestamp.setText((new Date(lastKnownLoc.getTime())                     .toString()));             tvProvider.setText(lastKnownLoc.getProvider());         }         tvStatus.setText(message);         // Toast.makeText(context, message, Toast.LENGTH_SHORT).show();     } };