问用libGDX寻找imageButton指数的牛肝菌

EN

  ImageButtonStyle style = new ImageButtonStyle();
  style.imageUp = buttonsImagesUp;
  style.imageDown = buttonsImagesDown;
  ImageButton newgameButton = new ImageButton(style);
  newgameButton.setPosition(425,330);

public class ButtonTest extends ActivityInstrumentationTestCase2<MainActivity> {

   private Solo solo;

   @SuppressWarnings("deprecation")
   public ButtonTest() {
      super("com.me.myGame", MainActivity.class);
   }

   protected void setUp() throws Exception {
      super.setUp();
      solo = new Solo(getInstrumentation(), getActivity());
   }

   public void testMenu(){
      solo.assertCurrentActivity("First menu selected",  MainActivity.class);
      solo.clickOnImageButton(index); //need index
   }
}

  @Override
   public void create() {
      playSound = userPref.getBoolean("playSounds");
       setScreen(mainMenuScreen);              
   }