Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Android Threads and Services But Wait There's More! Messengers and Handlers: Activity

Handle the Message in GeolocationService, and use the 'replyTo' property to send a new Message back to MainActivity with

setCoordinates not accessible

MainActivity.java
// some methods omitted

public class MainActivity extends Activity {
    Boolean isBound = false;
  int latitude;
  int longitude;
    Messenger mServiceMessenger;
      public  Messenger mMainActivityMessenger = new Messenger(new LocHandler());

    ServiceConnection mServiceConnection = new ServiceConnection() {
      @Override  
      public void onServiceConnected(ComponentName name, IBinder binder) {



        isBound = true;
        mServiceMessenger = new Messenger(binder);
          if (mServiceMessenger != null) {
                Message msg = Message.obtain();
                msg.replyTo = mMainActivityMessenger;
                mServiceMessenger.send(msg);
        }

      }

    public void setCoordinates(int lat, int longi) {
      latitude=lat;
      longitude=longi;
    }
      @Override
      public void onServiceDisconnected(ComponentName name) {
        isBound = false;
      }
    };
class LocHandler extends Handler {
      @Override
      public void handleMessage(Message msg) {
     // mServiceMessenger =   new Messenger(new LocHandler());
          setCoordinates(msg.arg1, msg.arg2);

      }
    }
}
GeolocationService.java
// some methods omitted
public class GeolocationService extends Service {
    int mLatitude;
    int mLongitude;
    public Messenger mMessenger = new Messenger(new LocationHandler());

    @Override
    public IBinder onBind(Intent intent) {
      return mMessenger.getBinder();
    }

   class LocationHandler extends Handler {
    // public MainActivity main;
   //  public LocHandler hand = new LocHandler();

     @Override
      public void handleMessage(Message msg) {

       mLatitude = getLatitude(); 
        mLongitude = getLongitude();
        Message message = Message.obtain();
        message.arg1 = mLatitude; 
        message.arg2 = mLongitude;
       // message.replyTo = mMessenger;
       // message.replyTo.send(msg);

  //setCoordinates(message.arg1, message.arg2);
          //setCoordinates(mLatitude, mLongitude);

      }  
    }
}
Difficulty.java
  public class Difficulty {
    public static Boolean HARDMODE = false;    
  }