如何在RecycleView中正确使用毕加索库

Question

“java.lang.OutOfMemoryError”

.我想是因为我用了毕加索在我的RecycleView适配器。

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);
        }

    }
}

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

Answer 1

您会得到java.lang.OutOfMemoryError错误，因为您的应用程序超出了提供给它的总内存。

在您的应用程序中，这可能是因为您在recyclerView中显示的图像尺寸较大，并且在显示之前未将其缩放到imageview的大小

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

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

或者你可以用Glide代替毕加索

  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 ) 
     .int‌​o(your_imageview)

您还可以通过在清单中启用大型堆来增加分配给应用程序的默认内存

android:largeHeap="true"