code: @Override
      public void onEnd(boolean result, BaseSliderView target) {
          if(target.isErrorDisappear() == false || result == true){
              return;
          }
          for (BaseSliderView slider: mImageContents){
              if(slider.equals(target)){
                  removeSlider(target);
                  break;
              }
          }
      }
docs: When image download error, then remove.
  @param result
  @param target