RecycleView中如何正确使用Picasso库

Question

我有一个产品列表，其中包含一个包含 CardView 的回收视图。每个 CardView 都有一张产品图片。

问题是我收到

"java.lang.OutOfMemoryError"

。我认为是因为我在我的 RecycleView 适配器中使用了 Picasso。

代码如下：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.List;

import uk.co.something.R;
import uk.co.something.Product;


public class ProductListAdapter extends RecyclerView.Adapter<ProductListAdapter.ViewHolder> {
    private List<Product> products;
    private int rowLayout;
    private Context appContext;

    public ProductListAdapter(List<Product> products, int rowLayout, Context appContext) {
        this.products = products;
        this.rowLayout = rowLayout;
        this.appContext = appContext;
    }

    @Override
    public ProductListAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(rowLayout, viewGroup, false);
        return new ProductListAdapter.ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ProductListAdapter.ViewHolder viewHolder, int i) {
        Product product = products.get(i);
        Picasso.with(appContext).load(product.getUrl().getImage()).into(viewHolder.image);
        Picasso.with(appContext).load(product.getRetailer().getIcon()).into(viewHolder.logo);
        String productPrice = (product.getPrice().getDiscounted() == null || Double.parseDouble(product.getPrice().getDiscounted()) <= 0) ? product.getPrice().getCost() : product.getPrice().getDiscounted();
        viewHolder.price.setText("\u00a3" + productPrice);

    }

    @Override
    public int getItemCount() {
        return products == null ? 0 : products.size();
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        public ImageView image;
        public ImageView logo;
        public TextView price;

        ViewHolder(View itemView) {
            super(itemView);
            image = (ImageView) itemView.findViewById(R.id.product_list_cardview_image);
            logo = (ImageView) itemView.findViewById(R.id.product_list_cardview_logo);
            price = (TextView) itemView.findViewById(R.id.product_list_cardview_price);
        }

    }
}

我遇到的错误是：

E/AndroidRuntime: FATAL EXCEPTION: main Process: uk.co.lexel.dimble, PID: 5503 java.lang.OutOfMemoryError: Failed to allocate a 11760012 byte allocation with 4269112 free bytes and 4MB until OOM at dalvik.system.VMRuntime.newNonMovableArray(Native Method) at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609) at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444) at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1080) at android.content.res.Resources.loadDrawableForCookie(Resources.java:2635) at android.content.res.Resources.loadDrawable(Resources.java:2540) at android.content.res.Resources.getDrawable(Resources.java:806) at android.content.Context.getDrawable(Context.java:458) at android.support.v4.content.ContextCompatApi21.getDrawable(ContextCompatApi21.java:30) at android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:372) at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:202) at android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:190) at android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100) at android.support.v7.widget.AppCompatImageHelper.loadFromAttributes(AppCompatImageHelper.java:54) at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:66) at android.support.v7.widget.AppCompatImageView.(AppCompatImageView.java:56) at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:106) at android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java:1021) at android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java:1080) at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:47) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:746) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) at android.view.LayoutInflater.rInflate(LayoutInflater.java:835) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) at android.view.LayoutInflater.rInflate(LayoutInflater.java:838) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) at android.view.LayoutInflater.rInflate(LayoutInflater.java:838) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) at android.view.LayoutInflater.inflate(LayoutInflater.java:515) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at uk.co.something.controllers.activities.ProductListAdapter.onCreateViewHolder(ProductListAdapter.java:35) at uk.co.something.controllers.activities.ProductListAdapter.onCreateViewHolder(ProductListAdapter.java:22) at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6290) at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5478) at android.support.v7.widget.GapWorker.prefetchPositionWithDeadline(GapWorker.java:270) at android.support.v7.widget.GapWorker.flushTaskWithDeadline(GapWorker.java:324) at android.support.v7.widget.GapWorker.flushTasksWithDeadline(GapWorker.java:337) at android.support.v7.widget.GapWorker.prefetch(GapWorker.java:344) at android.support.v7.widget.GapWorker.run(GapWorker.java:370) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

日志中说问题出在这里：

View v = LayoutInflater.from(viewGroup.getContext()).inflate(rowLayout, viewGroup, false);

有人可以帮助我吗？

Answer 1

您收到 java.lang.OutOfMemoryError 错误，因为您的应用超出了提供给它的总内存。

在您的应用中，这可能是因为您在 recyclerView 中显示的图像尺寸较大，并且在显示之前未缩放到 imageview 的尺寸

要使用 Picasso 正确缩放图像，您可以使用 Picasso 中的 .fit() 方法

例如

Picasso  
.with(context)
.load(UsageExampleListViewAdapter.eatFoodyImages[0])
.fit()
// call .centerInside() or .centerCrop() to avoid a stretched image
.into(imageViewFit);

或者您可以使用 Glide 而不是 Picasso

  compile 'com.github.bumptech.glide:glide:3.7.0'

例如

Glide.with(context) 
     .load(image)
     .asBitmap()‌.transform(new CenterCrop(context)) 
     .diskCacheStrategy( DiskCacheStrategy.NONE ) 
     .skipMemoryCache( true ) 
     .int‌o(your_imageview)

您还可以通过在您的清单中启用大堆来增加分配给您的应用程序的默认内存

例如

android:largeHeap="true"

有关缩放图像和加载图像的更多信息，您可以查看此 link：https://developer.android.com/training/displaying-bitmaps/load-bitmap.html

Answer 2

防止 java.lang.OutOfMemoryError 简单使用 Glide Image Loader 平滑 scrolling.Use 下面 link Glide Tutorial

Answer 3

在我的项目中，我使用了几乎所有的库来在recylerview 中加载图像，但是所有的库都有一些问题。但是 Universal Image Loader 在 recyclerview 中加载图像时是最好的。

RecycleView中如何正确使用Picasso库

How to properly use Picasso library in RecycleView

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