How to pass data service to activity?

Question

I have Three class

1.MenuActivity

2.LocationUpdateService

3.MultipleMarker

1.MenuActivity

@Override protected void onStart() { super.onStart(); bindService(new Intent(this, LocationUpdatesService.class), mServiceConnection, Context.BIND_AUTO_CREATE); }

2.LocationUpdateService:(This is Service Class)

 private 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); Toast.makeText(context,"Sending Data to BroadCast Receiver",Toast.LENGTH_LONG).show(); }

3.MultipleMarker(Activity)

 LocalBroadcastManager.getInstance(this).registerReceiver( mMessageReceiver, new IntentFilter("GPSLocationUpdates")); 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"); Log.d("messagesshow","****** "+message); Location lastKnownLoc = (Location) b.getParcelable("Location"); if (lastKnownLoc != null) { Log.d("messagesshow","***** "+String.valueOf(lastKnownLoc.getLatitude())); } Toast.makeText(context, "Data Receiver called", Toast.LENGTH_SHORT).show(); } };

My Problem is that : When i open My MenuActivity My Toast Messages printing Sending Data to BroadCast Receiver then onclick of Button I am calling MultipleMarker.class there i am not able to getting the values from service...But when i press back button i redirect to MenuActivity at that time i getting values...

I want to get data from my LocationUpdateservice class into in my MultipleMarker.class activity...

Hi you can create interface and set that as a listener on activity class and send callbacks from service class. — Pankaj Kant Patel
– Pankaj Kant Patel, Commented Jan 17, 2018 at 8:18
@PankajKantPatel Thank you sir..can you give some reference link please..how to set and get — Gowthaman M
– Gowthaman M, Commented Jan 17, 2018 at 8:20
Please look into bind service code and then use binder object to get instance of service object.i don't have code examples yet — Pankaj Kant Patel
– Pankaj Kant Patel, Commented Jan 17, 2018 at 8:23
where do you put LocalBroadcastManager.getInstance(this).registerReceiver( mMessageReceiver, new IntentFilter("GPSLocationUpdates")); ? — YinKiet
– YinKiet, Commented Jan 17, 2018 at 8:25

Diego D. · Accepted Answer · 2018-01-17 08:40:09Z

You can create an Interface and get your Service's reference following these steps:

In your LocationUpdateService add those attributes:

public class LocationUpdateService extends Service{ // The Binder is an intern class public class LocalBinder extends Binder { //The Binder as a method which return the service public LocationUpdateService getService() { return LocationUpdateService.this; } } private final IBinder mBinder = new LocalBinder(); }

Then in your MenuActivity:

public class MenuActivity extends AppCompatActivity { private LocationUpdateService mService; // Connection interface to the service private ServiceConnection mConnection = new ServiceConnection() { // Called when the activity connects to the service public void onServiceConnected(ComponentName className, IBinder service) { // Here you get the Service mService = ((LocationUpdateService.LocalBinder)service).getService(); } // Called when service is disconnected public void onServiceDisconnected(ComponentName className) { mService = null; } }; }

Then your bindService() method will call the onServiceConnected() and you will get the instance of your Service.

Note: onServiceConnected() is called asynchronously, so you can't use Service's methods right after calling bindService() because you'll have a NullPointerException.

D thank you for your suggestion sir..i will try it..i already start bind service
In the Activity's onDestroy() method, don't forget to call unbindService(mConnection)

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