Service binding and unbinding

Question

Now use that ServiceConnection to bind and unbind GeolocationService at the appropriate points in the Activity lifecycle. Also, add a new boolean field named 'isBound', and use it to make sure that we only call 'unbindService' if we're actually bound to the Service.

MainActivity.java

public class MainActivity extends Activity {
  private boolean isBound = true;
  private ServiceConnection serviceConnection = new ServiceConnection() {
  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
   isBound = true;
  }
  @Override
  public void onServiceDisconnected(ComponentName name) {
   isBound = false;
  }
  };
  int latitude;
  int longitude;

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

    Button updateLocationButton = (Button) findViewById(R.id.update_button);
    updateLocationButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v){

      }
    });

    @Override
    protected void onStart() {  
      super.onStart();
      Intent intent = new Intent(this, GeolocationService.class);
      bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
        isBound = true;
      }

  @Override
    protected void onStop() { 
      super.onStop();
        if(isBound){
      unbindService(serviceConnection);
        isBound = false;
         }
      }
  }
}

GeolocationService.java

public class GeolocationService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
      return null;
    }

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

Answer 1 · 2017-07-31T14:25:43Z

July 31, 2017 2:25pm

Hey Patrick!

In MainActivity you've got your brackets out of order. It looks like the closing bracket for onCreate is actually below onStop. Also, you want onStart and onStop to be 'public' instead of 'protected'.

Hope that helps!

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Patrick Munemo

Patrick Munemo

Service binding and unbinding

Patrick Munemo

Patrick Munemo

1 Answer

Ben Deitch

Ben Deitch