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Android Threads and Services Bound Services Using a Bound Service

Threads and services

Finally, update MainActivity's 'latitude' and 'longitude' fields with the correct coordinates when the user taps the Button.

GeolocationService.java
public class GeolocationService extends Service {
  private IBinder mBinder = new LocalBinder();

    @Override
    public IBinder onBind(Intent intent) {
      return mBinder;
    }
  public class LocalBinder extends Binder{
      public GeolocationService getService(){
         return GeolocationService.this;
      }
  }

    //Client methods
    public int getLatitude() { return getLat(); }    
    public int getLongitude() { return getLng(); }
}
MainActivity.java
public class MainActivity extends Activity {
  private GeolocationService mGeolocationService;
  int latitude;
  int longitude;
  boolean isBound;
  Button updateLocationButton;
  ServiceConnection serviceConnection = new ServiceConnection(){
    public void onServiceConnected(ComponentName name, IBinder binder){
      isBound = true;
      GeolocationService.LocalBinder localBinder = (GeolocationService.LocalBinder) binder;
      mGeolocationService = localBinder.getService();
    }
    public void onServiceDisconnected(ComponentName name){
      isBound = false;
    }  
  };  

  @Override
  public void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);

    updateLocationButton = (Button) findViewById(R.id.update_button);
    updateLocationButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v){
           if (isBound){
              if (mGeolocationService.latitude()){
              updateLocationButton.setText("Latitude");
              }else{
              mGeolocationService.longitude();
              updateLocationButton.setText("Longitude");
              }
           }

      }
    });
  } 

  @Override
  public void onStart() {
    Intent i = new Intent(this, GeolocationService.class);
    bindService(i, serviceConnection, Context.BIND_AUTO_CREATE);
  }

  @Override
  public void onStop() {
    if (isBound) {
      unbindService(serviceConnection);  
      isBound = false;
    }
  }
}

Steve Hunter , please help am stuck here

1 Answer

Hi there,

I'm out at the moment but I think you want to be using the two getter methods:

    public int getLatitude() { return getLat(); }    
    public int getLongitude() { return getLng(); }

which are in GeolocationService. Use those to set the latitude and longitude member variables of your activity.

Something like this inside onClick(). There's no need to distinguish between lat & long with an if statement - there's only one button!

latitude = mGeolocationService.getLatitude();
longitude = mGeolocationService.getLongitude();

Try using the above inside onClick instead of where you have you if statement. Keep the isBound if statement, though. As I said, I'm out at the moment but I'll get back to you with more when I am home again.

Steve.

You are a real life saver. Thanks a million times

It worked, then! ? :+1: