ListView con imagenes

listview-images.java

// Rutas:
// https://mymodernmet.com/wp/wp-content/uploads/2019/09/100k-ai-faces-3.jpg
// https://mymodernmet.com/wp/wp-content/uploads/2019/09/100k-ai-faces-8.jpg
// https://mymodernmet.com/wp/wp-content/uploads/2019/09/100k-ai-faces-7.jpg
// https://mymodernmet.com/wp/wp-content/uploads/2019/09/100k-ai-faces-4.jpg
// build.gradle (Module: App)
dependencies {
  ....
  implementation 'com.android.volley:volley:1.1.1'
}
//====================================================
// helpers/QueueUtils.java
package info.rayrojas.bichito.frutapp.helpers;

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;

public class QueueUtils {
    private static QueueObject uniqueInstance;

    public static class QueueObject {
        private RequestQueue mRequestQueue;
        private ImageLoader mImageLoader;
        private static Context mCtx;

        private QueueObject(Context context) {
            mCtx = context;
            mRequestQueue = getRequestQueue();

            mImageLoader = new ImageLoader(mRequestQueue,
                    new ImageLoader.ImageCache() {
                        private final LruCache<String, Bitmap>
                                cache = new LruCache<String, Bitmap>(20);

                        @Override
                        public Bitmap getBitmap(String url) {
                            return cache.get(url);
                        }

                        @Override
                        public void putBitmap(String url, Bitmap bitmap) {
                            cache.put(url, bitmap);
                        }
                    });
        }
        public RequestQueue getRequestQueue() {
            if (mRequestQueue == null) {
                // getApplicationContext() is key, it keeps you from leaking the
                // Activity or BroadcastReceiver if someone passes one in.
                mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
            }
            return mRequestQueue;
        }
        public <T> void addToRequestQueue(Request<T> req) {
            getRequestQueue().add(req);
        }

        public ImageLoader getImageLoader() {
            return mImageLoader;
        }
    }
    public static synchronized QueueObject getInstance(Context context) {
        if (uniqueInstance == null) {
            uniqueInstance = new QueueObject(context);
        }
        return uniqueInstance;
    }

}
//====================================================
// En ActivityMain.java
public class ProductListActivity extends AppCompatActivity {
    ...
    QueueObject queue = null;
    ...
    ProductAdapter itemsAdapter;
    ...
      
    @Override
    protected void onCreate(Bundle savedInstanceState) {  
        ...
        queue = QueueUtils.getInstance(this.getApplicationContext());
        itemsAdapter =
            new ProductAdapter(this, items, queue.getImageLoader());
        ...
    }
//====================================================
// Layout
<com.android.volley.toolbox.NetworkImageView
        android:id="@+id/image"
        android:layout_width="100dp"
        android:layout_height="100dp" />
//====================================================

// ProductAdapter.java
...
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
...

public class ProductAdapter extends ArrayAdapter<Product> {
    Context context;
    ImageLoader queue; //<-------- Añadir esta variable

    private class ViewHolder {
        NetworkImageView image; //<-------- Añadir esta variable
        TextView name;
        TextView price;
        ...

        private ViewHolder() {
        }
    }
    ...
    public ProductAdapter(Context context, List<Product> items, ImageLoader _queue) { //<-------- Verificar ImageLoader
      super(context, 0, items);
      this.context = context;
      this.queue = _queue; //<---- Notar esa linea
    } 
  
    public View getView(final int position, View convertView, ViewGroup parent) {
      ...
      holder.image = (NetworkImageView)convertView.findViewById(R.id.image); //<----- Notar esta linea    
      ...
      if ( rowItem.getSmallImage() != null ) { //<----- El modelo debe poseer esta function
          holder.image.setImageUrl(rowItem.getSmallImage(), queue);
      }
      ...
      return convertView;
    }
}