code: private ImageView getImageView(final int position) {
          if (position < mImageViewList.size()) {
              return mImageViewList.get(position);
  
          } else {
              if (mAdapter != null) {
                  ImageView imageView = mAdapter.generateImageView(getContext());
                  mImageViewList.add(imageView);
                  return imageView;
              } else {
                  Log.e("9GridImageView", "你必须为LQRNineGridImageView设置LQRNineGridImageViewAdapter");
                  return null;
              }
          }
      }
docs: 获得 ImageView
  保证了ImageView的重用
  
  @param position 位置