图像未显示在 RecyclerView 中

Question

我已经用后端 node.js mysql 实现了 RecyclerView 并且我已经为图像设置了一个文件夹。在 android 中，RecyclerView 工作正常，但是当我决定使用 url 中的动态图像时，它们不会在 RecyclerView 中显示，我正在从 JSON.

{
  "location_id": 3,
  "datelocation": "15/10/2020 15:11",
  "adresselocation": "Klibia",
  "bike_id": 3,
  "user_id": 10,
  "model": "Skygrey",
  "type": "RTT",
  "price": "55",
  "image": "http://localhost:3000/bike2.png"
}

我的适配器是这样设置的：

public class BikesAdapter extends RecyclerView.Adapter<BikesAdapter.BikesViewHolder> {

    private final ArrayList<Bike> bikes;
    private Context mContext;
    private Callback mCallback;

    public BikesAdapter(Context mContext, ArrayList<Bike> bikes) {
        this.mContext = mContext;
        this.bikes = bikes;
    }

    @NonNull
    @Override
    public BikesAdapter.BikesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View mItemView = LayoutInflater.from(mContext).inflate(R.layout.bike_list_item, parent, false);
        return new BikesViewHolder(mItemView, this);
    }

    @Override
    public void onBindViewHolder(@NonNull BikesAdapter.BikesViewHolder holder, int position) {
        final Bike singleItem = bikes.get(position);

        holder.BikeName.setText(singleItem.getModel());

        Picasso.with(mContext).load(singleItem.getImage()).resize(50, 50).into(holder.BikeImage);

        holder.bikeView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCallback.onItemClicked(singleItem);
            }
        });
        holder.BikeImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(mContext, singleItem.getModel(), Toast.LENGTH_SHORT).show();
            }
        });
    }

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

    public class BikesViewHolder extends RecyclerView.ViewHolder {

        public final TextView BikeName;
        public final ImageView BikeImage;
        public final Button bikeView;
        final BikesAdapter mAdapter;

        public BikesViewHolder(@NonNull View itemView, BikesAdapter mAdapter) {
            super(itemView);
            this.BikeName = itemView.findViewById(R.id.bikeName);
            this.BikeImage = itemView.findViewById(R.id.bikeImage);
            this.bikeView = itemView.findViewById(R.id.btn_view);
            this.mAdapter = mAdapter;
        }
    }
    
    public void setCallback(Callback callback) {
        mCallback = callback;
    }

    public interface Callback {
        void onItemClicked(Bike bike);
    }
}

这里有什么问题？为什么图像没有显示在我的 RecyclerView 中？我试过 Picasso，就像你在 BikeAdapter 中看到的 onBindViewHolder() 方法一样，我缺少什么我不明白！

Answer 1

首先，我们称呼毕加索的方式发生了变化。

Picasso.get().load("imageUrl").into(imageView);

还要检查您的清单中是否有互联网许可

<uses-permission android:name="android.permission.INTERNET"/>

最后尝试打开Picasso logs看看有没有报错

Picasso.get().setLoggingEnabled(true)

以防万一，请确保您的图像 url 在浏览器上正确加载。

图像未显示在 RecyclerView 中

Images are not displaying in RecyclerView

android

android-recyclerview

picasso