Android Picasso Recyclerview图像下载缓慢

概述我有无尽的recyclerview,几乎可以模仿Instagram列表/提要.Image正在加载到全屏宽度Imageview中.我正在使用Picasso加载图像.这是我的代码：publicclassHomeAdapterextendsRecyclerView.Adapter{Contextcontext;privateContractcontract;List<Feed>feeds;staticf

我有无尽的recyclervIEw,几乎可以模仿Instagram列表/提要. Image正在加载到全屏宽度ImagevIEw中.我正在使用Picasso加载图像.这是我的代码：

public class HomeAdapter extends RecyclerVIEw.Adapter {Context context;private Contract contract;List<Feed> Feeds;static final int ITEM_TYPE_header = 0;static final int ITEM_TYPE_LOAD_MORE = 1;static final int ITEM_TYPE_DESIGN = 2;public HomeAdapter(Context context, List<Feed> Feeds) {    this.context = context;    this.Feeds = Feeds;}@OverrIDepublic RecyclerVIEw.VIEwHolder onCreateVIEwHolder(VIEwGroup parent, int vIEwType) {    LayoutInflater inflater = LayoutInflater.from(parent.getContext());    VIEw row;    if (vIEwType == ITEM_TYPE_header) {        row = inflater.inflate(R.layout.List_item_home_header, parent, false);        return new headerHolder(row);    } else if (vIEwType == ITEM_TYPE_LOAD_MORE) {        row = inflater.inflate(R.layout.List_item_load_more, parent, false);        return new LoadMoreHolder(row);    } else if (vIEwType == ITEM_TYPE_DESIGN) {        row = inflater.inflate(R.layout.List_item_Feed_home, parent, false);        return new DesignItemHolder(row);    }    return null;}@OverrIDepublic voID onBindVIEwHolder(RecyclerVIEw.VIEwHolder holder, final int position) {    Feed Feed = Feeds.get(position);    if (holder instanceof headerHolder) {        headerHolder headerHolder = (headerHolder) holder;        header header = (header) Feed;        headerHolder.tvTitle.setText(header.getTitle());        headerHolder.tvDescription.setText(header.getDescription());    } else if (holder instanceof LoadMoreHolder) {        LoadMoreHolder loadMoreHolder = (LoadMoreHolder) holder;        LoadMore loadMore = (LoadMore) Feed;        if(loadMore.getType() == LOAD_MORE_TYPE_PROGRESS) {            loadMoreHolder.pbLoadMore.setVisibility(VIEw.VISIBLE);            loadMoreHolder.rlMessageRetry.setVisibility(VIEw.GONE);        } else {            loadMoreHolder.pbLoadMore.setVisibility(VIEw.GONE);            loadMoreHolder.rlMessageRetry.setVisibility(VIEw.VISIBLE);            if(StringUtils.isValID(loadMore.getTitle())) {                loadMoreHolder.tvTitle.setText(loadMore.getTitle());                loadMoreHolder.tvTitle.setVisibility(VIEw.VISIBLE);            } else                loadMoreHolder.tvTitle.setVisibility(VIEw.GONE);            if(StringUtils.isValID(loadMore.getDescription())) {                loadMoreHolder.tvDescription.setText(loadMore.getDescription());                loadMoreHolder.tvDescription.setVisibility(VIEw.VISIBLE);            } else                loadMoreHolder.tvDescription.setVisibility(VIEw.GONE);        }        loadMoreHolder.btnRetry.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onRetryLoadMoreClick();            }        });    } else if (holder instanceof DesignItemHolder) {        final DesignItemHolder designItemHolder = (DesignItemHolder) holder;        final DesignFeed designFeed = (DesignFeed) Feed;        String Title = getFeedTitle(designFeed.getDesigncategory().getTitle(), designFeed.getEvent().getTitle());        designItemHolder.tvcategory.setText(StringUtils.toupperCaseSentence(designFeed.getDesigncategory().getTitle()));        designItemHolder.tvDate.setText(DateTimeUtils.formatTime(designFeed.getDate()));        designItemHolder.tvTitle.setText(StringUtils.toupperCaseSentence(Title));        designItemHolder.tvBrand.setText(getBrandTitle(designFeed.getBrand().getTitle()));        if(StringUtils.isValID(designFeed.getShoplink())) {            designItemHolder.tvShop.setVisibility(VIEw.VISIBLE);            if(StringUtils.isValID(designFeed.getPrice())) {                designItemHolder.tvPrice.setVisibility(VIEw.VISIBLE);                designItemHolder.tvPrice.setText(designFeed.getPrice() + " PKR");            } else                designItemHolder.tvPrice.setVisibility(VIEw.GONE);            designItemHolder.tvShop.setonClickListener(new VIEw.OnClickListener() {                @OverrIDe                public voID onClick(VIEw vIEw) {                    if(contract != null)                        contract.onopenShoplink(designFeed.getShoplink());                }            });        }        else {            designItemHolder.tvPrice.setVisibility(VIEw.GONE);            designItemHolder.tvShop.setVisibility(VIEw.GONE);        }        showFeedImage(designFeed, designItemHolder.ivthumbnail, designItemHolder.progressbar);        Picasso.get()                .load(designFeed.getDesigncategory().getthumbnail())                .transform(new Circletransform())                .placeholder(new colorDrawable(ContextCompat.getcolor(context, R.color.colorGreylight)))                .into(designItemHolder.ivcategory);        designItemHolder.ivthumbnail.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onDesignFeedClick(designFeed);            }        });        designItemHolder.tvcategory.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onDesigncategoryClick(designFeed.getDesigncategory());            }        });        designItemHolder.ivcategory.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onDesigncategoryClick(designFeed.getDesigncategory());            }        });        designItemHolder.tvTitle.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onDesigncategoryClick(designFeed.getDesigncategory());            }        });        designItemHolder.tvBrand.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onBrandClick(designFeed.getBrand());            }        });        designItemHolder.ibFavourite.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onFavouriteClick(designFeed);            }        });        designItemHolder.ibShare.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onShareClick(designFeed);            }        });        designItemHolder.ibDownload.setonClickListener(new VIEw.OnClickListener() {            @OverrIDe            public voID onClick(VIEw vIEw) {                if(contract != null)                    contract.onDownloadClick(designFeed);            }        });    }}private voID showFeedImage(final DesignFeed designFeed, final ImageVIEw ivthumbnail, final Progressbar progressbar) {    Picasso.get()            .load(designFeed.getthumbnail())            .placeholder(new colorDrawable(ContextCompat.getcolor(context, R.color.colorGreylight)))            .networkPolicy(NetworkPolicy.OFFliNE)            .into(ivthumbnail, new Callback() {                @OverrIDe                public voID onSuccess() {                }                @OverrIDe                public voID one rror(Exception e) {                    //Try again online if cache Failed                    Picasso.get()                            .load(designFeed.getthumbnail())                            .placeholder(new colorDrawable(ContextCompat.getcolor(context, R.color.colorGreylight)))                            .into(ivthumbnail, new Callback() {                                @OverrIDe                                public voID onSuccess() {                                }                                @OverrIDe                                public voID one rror(Exception e) {                                }                            });                }            });}@OverrIDepublic int getItemVIEwType(int position) {    Feed Feed = Feeds.get(position);    if (Feed instanceof header)        return ITEM_TYPE_header;    else if (Feed instanceof LoadMore)        return ITEM_TYPE_LOAD_MORE;    else if (Feed instanceof DesignFeed)        return ITEM_TYPE_DESIGN;    else        return super.getItemVIEwType(position);}@OverrIDepublic int getItemCount() {    return Feeds.size();}public voID insertFeedAtStart(Feed Feed) {    Feeds.add(0, Feed);    notifyDataSetChanged();}public voID updateFeeds(ArrayList<Feed> mFeeds) {    Feeds.addAll(mFeeds);    notifyDataSetChanged();}public voID addLoadMoreItem(Feed loadMoreFeed) {    Feeds.add(loadMoreFeed);    notifyItemInserted(getItemCount() - 1);}public voID removeItem(int index) {    Feeds.remove(index);    notifyDataSetChanged();}private class DesignItemHolder extends RecyclerVIEw.VIEwHolder {    TextVIEw tvTitle, tvcategory, tvBrand, tvDate, tvPrice, tvShop;    ImageVIEw ivcategory, ivthumbnail;    Imagebutton ibFavourite, ibShare, ibDownload;    Progressbar progressbar;    DesignItemHolder(VIEw itemVIEw) {        super(itemVIEw);        tvTitle = itemVIEw.findVIEwByID(R.ID.tvTitle);        tvcategory = itemVIEw.findVIEwByID(R.ID.tvcategory);        tvBrand = itemVIEw.findVIEwByID(R.ID.tvBrand);        tvDate = itemVIEw.findVIEwByID(R.ID.tvDate);        ivcategory = itemVIEw.findVIEwByID(R.ID.ivcategory);        ivthumbnail = itemVIEw.findVIEwByID(R.ID.ivthumbnail);        tvPrice = itemVIEw.findVIEwByID(R.ID.tvPrice);        tvShop = itemVIEw.findVIEwByID(R.ID.tvShop);        ibFavourite = itemVIEw.findVIEwByID(R.ID.ibFavourite);        ibShare = itemVIEw.findVIEwByID(R.ID.ibShare);        ibDownload = itemVIEw.findVIEwByID(R.ID.ibDownload);        progressbar = itemVIEw.findVIEwByID(R.ID.progressbar);    }}private class headerHolder extends RecyclerVIEw.VIEwHolder {    TextVIEw tvTitle, tvDescription;    headerHolder(VIEw itemVIEw) {        super(itemVIEw);        tvTitle = itemVIEw.findVIEwByID(R.ID.tvTitle);        tvDescription = itemVIEw.findVIEwByID(R.ID.tvDescription);    }}private class LoadMoreHolder extends RecyclerVIEw.VIEwHolder {    Progressbar pbLoadMore;    relativeLayout rlMessageRetry;    TextVIEw tvTitle, tvDescription;    AppCompatbutton btnRetry;    LoadMoreHolder(VIEw itemVIEw) {        super(itemVIEw);        pbLoadMore = itemVIEw.findVIEwByID(R.ID.pbLoadMore);        rlMessageRetry = itemVIEw.findVIEwByID(R.ID.rlMessageRetry);        tvTitle = itemVIEw.findVIEwByID(R.ID.tvTitle);        tvDescription = itemVIEw.findVIEwByID(R.ID.tvDescription);        btnRetry = itemVIEw.findVIEwByID(R.ID.btnRetry);    }}public voID setContract(Contract contract) {    this.contract = contract;}public interface Contract {    voID onDesigncategoryClick(Designcategory designcategory);    voID onDesignFeedClick(DesignFeed designcategory);    voID onBrandClick(Brand brand);    voID onRetryLoadMoreClick();    voID onShopClick(String shoplink);    voID onFavouriteClick(DesignFeed designFeed);    voID onShareClick(DesignFeed designFeed);    voID onDownloadClick(DesignFeed designFeed);    voID onopenShoplink(String shoplink);}

}

平均图像大小为80-100 kbs.但是图像下载时间太慢.下载图像大约需要3-4秒.另一方面,从高速缓存加载图像时,显然可以立即加载图像.我从服务器获得15项内容以加载到recyclervIEw中,这意味着将并行下载15张图像.但与Instagram或Facebook提要相比,它仍然相当慢.

谁能指导我如何尽快使之正确的技术,以便当用户向下滚动列表时,应该已经加载了图像,而不是他等待图像加载？

解决方法:

实际上,我使用lib已有很长时间了,没有任何网络问题.我试图分析代码,发现以下内容：

>问题可能是转换由于lib首先转换输入的图像然后显示,请参阅此部分

Picasso.get()

    .load(designFeed.getDesigncategory().getthumbnail())    .transform(new Circletransform())    .placeholder(new colorDrawable(ContextCompat.getcolor(context,      R.color.colorGreylight)))    .into(designItemHolder.ivcategory);

建议：如果您要以圆形视图显示图像.然后使用CircularImageVIEw,不要释放I / O.

>使用其他功能强大的设备检查性能

编辑

>检查您的手机的网络使用情况,正在消耗哪个应用程序,多少兆字节,因为某些应用程序在后台静默使用您的网络
>为什么在您的浏览器中速度很快？因为您的浏览器未对图像进行任何额外的 *** 作

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