import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class SomeService extends Service {

  final private IBinder binder = new SomeBinder();

  public class SomeBinder extends Binder {
    SomeService getService() {
      return SomeService.this;
    }
  }

  @Override
  public void onCreate() {
    super.onCreate();
    // ...
  }

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