与凌空图像请求循环器视图（取消请求） [英] Recycler view with volley image request (cancel request)

问题描述

所以我使用回收视图显示URL在网格中的图像和下载图像，使用凌空库位图。

So i am using recycler view to show images in a grid and downloading images from url as bitmaps using volley library.

public void onBindViewHolder(final TrendingAdapter.ViewHolder viewHolder, int i) {
    ImageRequest request = new ImageRequest(url, new Response.Listener<Bitmap>() {
        @Override
        public void onResponse(Bitmap bitmap) {
            if (bitmap != null) {
                viewHolder.getmImageView().setImageBitmap(bitmap);
            }
        }
    }, 0, 0, null,
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError) {
                }
            });
    AppController.getInstance().addToRequestQueue(request);
}

问题是，当我滚动并跳过一个或多个视图下载图像之前和看法回收图像donwnload reqest不会取消对造成一个闪光的中间视/前的那些图像（S）实际的图像被载入这一观点。

The problem is when i scroll and skip one or more views before the image is downloaded and that view is recycled the image donwnload reqest is not canceled on those intermediate view resulting in a flash of that/those image(s) before the actual image is loaded in that view.

所以，我认为取消使用标签的中间图像的请求，但无法弄清楚如何，因为它导致在其他并行意见要求取消的！

So i thought of canceling those intermediate image requests using tags but cannot figure out how as it results in canceling of request in other parallel views as well!

此外，当我使用凌空NetworkImageView（即HANDELS这样的图像本身取消）给出了完美的效果。但我需要得到每个图像的位图来挑选颜色，所以我不能使用NetworkImageView。

Also when i use volley NetworkImageView (that handels such image canceling by itself) gives perfect results. But i need to get bitmap of every image to pick colors from it so i cannot use NetworkImageView.

Q）我如何取消所有未决的大力抽射图像requsts（除了一个应该加载和没有在一个特定的ImageView影响其他平行视图）使用充气recyclerview？

推荐答案

您应该使用 ImageLoader的类，而不是直接添加到一个请求请求队列。这样一来，的get（）方法，它是用来获取图像，返回类型的对象 ImageContainer 。

You should use the ImageLoader class instead of directly adding a request to the RequestQueue. That way, the get() method, which is used to get images, will return an object of type ImageContainer.

保存此 ImageContainer 在 ViewHolder ，当一个视图被循环使用，只需调用 cancelRequest（）再生图象上的方法，如果它尚未执行以取消该请求。

Save this ImageContainer in the ViewHolder, and when a view gets recycled, simply call the cancelRequest() method on the recycled image to cancel the request if it hasn't been performed yet.

看看在 NetworkImageView 的code。它的工作原理以类似的方式

Take a look at the NetworkImageView's code. It works in a similar way.

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