如何首先从NetworkImageView中的URL显示缩略图图像并在后台请求大尺寸图像并在下载大图像时显示？

Question

I am using Volley and I have a single NetworkImageView with two image urls, one small thumb image and other large full size image. I want to first check in cache for large image, if it found then show in NetworkImageView else check thumb image in cache if found then show in view and if not found then first load thumb image from a url in NetworkImageView.

at the same time if large image not found in cache then request large image url in background and replace thumb image with large image when download completed.

problem is NetworkImageView taking drawable resource id only as a default placeholder or error image, it should take dynamic url too

Answer 1

i have solved my issue using below code:

Picasso.with(getActivity())
                    .load(thumbImageUrl)
                    .error(defaultImageUrl)
                    .placeholder(defaultImageUrl)
                    .into(ImageView_sliderImage, new Callback()
                    {
                        @Override
                        public void onSuccess()
                        {
                            if(imageUrl!=null && imageUrl.length()>0)
                            {
                                Picasso.with(getActivity())
                                        .load(biggerImageUrl)
                                        .error(defaultImageUrl)
                                        .placeholder(ImageView_sliderImage.getDrawable())
                                        .into(ImageView_sliderImage);
                            }
                        }
                        @Override
                        public void onError()
                        {

                        }
                    });