Recyclerview痛苦加载缓慢缓存图像形成毕加索

问题描述

我已经实现了一个包含主要是通过加载毕加索在图像的RecyclerView。我的问题是，当我滚动向下或向上的观点，占位符图像出现约。前它的第二被替换的实际图像。它滚动很顺利，但实际上是无法使用的。出现这种情况，每次的东西滚出屏幕。

I have implemented a RecyclerView that contains mainly images which is loading in through Picasso. My problem is that as soon as I scroll down or up the view, the placeholder image appears for approx. a second before it is replaced by the actual image. It scrolls very smoothly, but is practically unusable. This happens every time something scrolls off the screen.

毕加索显然缓存图像到磁盘，因为它们加载比初始加载时间更快，但它们绝对立即从高速缓存重新加载。我是怎么落实不正确？

Picasso is clearly caching the images to the disk, as they load faster than the initial load time, but they are definitely instantly reloading from the cache. What did i implement incorrectly?

我的适配器code：

public class ExploreAdapter extends RecyclerView.Adapter<ExploreAdapter.ExploreViewHolder> {

    private List<ExploreItem> exploreItemList;
    private Context mContext;
    private int deviceWidth = PrefUtils.getDeviceWidth();

    public ExploreAdapter(Context context, List<ExploreItem> exploreItemList){
        this.mContext = context;
        this.exploreItemList = exploreItemList;
    }

    @Override
    public int getItemCount(){
        return exploreItemList.size();
    }

    @Override
    public void onBindViewHolder(ExploreViewHolder exploreViewHolder, int i){
        ExploreItem item = exploreItemList.get(i);
        exploreViewHolder.getvTitle().setText(item.getTitle());
        exploreViewHolder.getvUsername().setText(item.getUsername());
        exploreViewHolder.getvNumLikes().setText(item.getNbOfLikes());

        Picasso.with(mContext).load(item.getMediaLocation().trim())
                .resize(deviceWidth, deviceWidth)
                .centerCrop()
                .placeholder(R.drawable.profile_background)
                .into(exploreViewHolder.getvImage());

        Picasso.with(mContext).load(item.getUserProfilePicUrl().trim())
                .placeholder(R.drawable.profile_picture)
                .into(exploreViewHolder.getvProfilePic());
    }

    @Override
    public ExploreViewHolder onCreateViewHolder(ViewGroup viewGroup, int i){
        View itemView = LayoutInflater.
                from(viewGroup.getContext()).
                inflate(R.layout.explore_item, viewGroup, false);

        return new ExploreViewHolder(itemView);
    }

    public static class ExploreViewHolder extends RecyclerView.ViewHolder{
        private TextView  vTitle,
                          vUsername,
                          vNumLikes;

        private SquareImage vImage;
        private ImageView vProfilePic;

        public ExploreViewHolder(View v){
            super(v);
            this.vTitle = (TextView) v.findViewById(R.id.explore_item_title);
            this.vUsername = (TextView) v.findViewById(R.id.explore_item_username);
            this.vNumLikes = (TextView) v.findViewById(R.id.explore_item_number_likes);
            this.vImage = (SquareImage) v.findViewById(R.id.explore_item_image);
            this.vProfilePic = (ImageView) v.findViewById(R.id.explore_item_profile_picture);
        }

        public TextView getvTitle() {
            return vTitle;
        }

        public TextView getvUsername() {
            return vUsername;
        }

        public ImageView getvProfilePic() {
            return vProfilePic;
        }

        public SquareImage getvImage() {
            return vImage;
        }

        public TextView getvNumLikes() {
            return vNumLikes;
        }

        public void setvImage(SquareImage vImage) {
            this.vImage = vImage;
        }

        public void setvNumLikes(TextView vNumLikes) {
            this.vNumLikes = vNumLikes;
        }

        public void setvProfilePic(ImageView vProfilePic) {
            this.vProfilePic = vProfilePic;
        }

        public void setvTitle(TextView vTitle) {
            this.vTitle = vTitle;
        }

        public void setvUsername(TextView vUsername) {
            this.vUsername = vUsername;
        }
    }
}

任何帮助是AP preciated。

Any help is appreciated.

推荐答案

我最近遇到了这个问题，是的，你是对的。毕加索是表示从SD卡的图像一个好的图书馆，但它对于缓存的一些问题，如果你是在网上获取的图像，这就是为什么你看到一个占位符图像，同时滚动。我尝试不同的事情，这个问题并没有得到解决。

I have encountered this issue recently, and yes you are right.Picasso is a good library for showing images from sdcard but it has some issues regarding cache if you are fetching images online that is why you see a place holder image while scrolling. I tried different things and the issue was not resolved.

有一个备用库，即AQuery这是非常好的从网络获取和缓存的图像。

There is an alternate library i.e. "AQuery" which is very good for fetching and caching images from network.

HTTP：//$c$c.google.com/p/android -query /

AQuery / Android的查询的主要优点是，你可以清除缓存，没有滞后而滚动和缓存图像不显示占位图片滚动时相当有效。

The main advantages of AQuery/Android Query is that you can clear the cache, no lag while scrolling and quite effective for caching images and not showing place holder images while scrolling.

我通过删除picaaso和使用Aquery解决了我的问题。它只是一个行更换，你完成了你的问题。

I resolved my issue by removing picaaso and using Aquery. Its just a one line replacement and you are done with your issue.

(new AQuery(mContext)).id(exploreViewHolder.getvProfilePic()).image(item.getUserProfilePicUrl().trim(), true, true, device_width, R.drawable.profile_background, aquery.getCachedImage(R.drawable.profile_background),0);

除此之外，您还可以轻松地从毕加索转向AQuery，因为没有这样的事情这是毕加索可用，但不是在AQuery和语法几乎是相同的。因此，我建议你使用AQuery，直到这是固定的毕加索。

Besides you can easily shift from picasso to AQuery as there is no such thing which is available in picasso but not in AQuery and the syntax is almost the same. So I would recommend you to use AQuery, until this is fixed by picasso.

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