https://gist.github.com/Yosuke-Kawakami/9777872 の派生。Volley の ImageLoader を拡張して画像取得中は ProgressBar を表示させるようにしてみた。

custom_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <ProgressBar
        android:id="@+id/row_progress"
        style="@android:style/Widget.ProgressBar.Large.Inverse"
        android:layout_width="wrap_content"
        android:layout_height="50sp"
        android:layout_margin="10sp" />

    <ImageView
        android:id="@+id/row_image"
        android:layout_width="wrap_content"
        android:layout_height="50sp"
        android:layout_margin="10sp"
        android:adjustViewBounds="true"
        android:contentDescription="@string/app_name"
        android:scaleType="centerCrop" />

    <TextView
        android:id="@+id/row_title"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:choiceMode="singleChoice"
        android:gravity="center_vertical"
        android:text="@string/app_name" />

</LinearLayout>

CustomAdapter.java

package org.example.test;

import java.util.List;

import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.ImageLoader.ImageContainer;
import com.android.volley.toolbox.ImageLoader.ImageListener;
import com.android.volley.toolbox.Volley;

import jp.co.deltawing.tweetline.tour2.BitmapCache;
import jp.co.deltawing.tweetline.tour2.MyImageLoader;
import jp.co.deltawing.tweetline.tour2.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class CustomAdapter extends ArrayAdapter<CustomData>{

    private LayoutInflater _layoutInflater;
    private RequestQueue   _requestQueue;
    private ImageLoader    _imageLoader;

    public CustomAdapter(Context context, int textViewResourceId, List<CustomData> objects){
        super(context, textViewResourceId, objects);
        _layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        _requestQueue = Volley.newRequestQueue(getContext());
        _imageLoader = new ImageLoader(_requestQueue, new BitmapCache());
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
	    
        ViewHolder viewHolder;
        if(convertView != null){
            viewHolder = (ViewHolder) convertView.getTag();
        }
        else{
            convertView = _layoutInflater.inflate(R.layout.custom_list, null);
            viewHolder             = new ViewHolder();
            viewHolder.progressBar = (ProgressBar)convertView.findViewById(R.id.row_progress);
            viewHolder.textView    = (TextView)convertView.findViewById(R.id.row_title);
            viewHolder.imageView   = (ImageView)convertView.findViewById(R.id.row_image);
            convertView.setTag(viewHolder);
        }


        CustomData item = (CustomData)getItem(position);
        viewHolder.textView.setText(item.getTitle());
        ImageContainer imageContainer = (ImageContainer)viewHolder.imageView.getTag();
        if(imageContainer != null){
            imageContainer.cancelRequest();
        }
        ImageListener imageListener = MyImageLoader.getImageListener(viewHolder.imageView, viewHolder.progressBar, android.R.drawable.ic_delete);
        viewHolder.imageView.setTag(_imageLoader.get(item.getBitmapUrl(), imageListener));

        return convertView;
    }
/*
 * 
 * 
 * 
 * 
 * 
 * 
 * 内部クラスなー
 * 	
 */
	private class ViewHolder {
		ProgressBar progressBar;
		TextView    textView;
		ImageView   imageView;
	}
}

MyImageLoader.java

package org.example.test;

import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;

import com.android.volley.RequestQueue;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageLoader;

public class MyImageLoader extends ImageLoader {

	public MyImageLoader(RequestQueue queue, ImageCache imageCache) {
		super(queue, imageCache);
	}
	
	/**
	 * 
	 * @param view
	 * @param progressBar
	 * @param errorImageResId
	 * @return
	 */
	public static ImageListener getImageListener(final ImageView view, final ProgressBar progressBar, final int errorImageResId) {
		return new ImageListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                if (errorImageResId != 0) {
                    view.setImageResource(errorImageResId);
                }
                else {
                    view.setImageResource(android.R.drawable.ic_menu_report_image);
                }
                if (progressBar != null) {
                    progressBar.setVisibility(View.GONE);
                }
		    }
            @Override
            public void onResponse(ImageContainer response, boolean isImmediate) {
                if (response.getBitmap() != null) {
                    view.setImageBitmap(response.getBitmap());
                    if (progressBar != null) {
                        progressBar.setVisibility(View.GONE);
                    }
                }
            }
        };
	}
}