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package cc.y;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.os.Bundle;import android.util.LruCache;import android.widget.ImageView;import com.android.volley.RequestQueue;import com.android.volley.Response;import com.android.volley.VolleyError;import com.android.volley.toolbox.ImageLoader;import com.android.volley.toolbox.ImageLoader.ImageCache;import com.android.volley.toolbox.ImageLoader.ImageListener;import com.android.volley.toolbox.ImageRequest;import com.android.volley.toolbox.NetworkImageView;import com.android.volley.toolbox.Volley;/** * Demo描述: * 去年一个项目中简单的使用了Volley,参见: * http://blog.csdn.net/lfdfhl/article/details/12223345 * 最近guolin写了几篇文章详细介绍Volley,所以在此比较系统地学习一下. * 在本示例中,主要包括: * 1 利用ImageRequest为ImageView加载网络图片 * 2 利用ImageLoader为ImageView加载网络图片 * 3 利用NetworkImageView为ImageView加载网络图片 *  * 注意事项: * 1 引入jar包volley.jar * 2 网络权限
    * 3 Volley源码分析,请参见: *   http://blog.csdn.net/guolin_blog/article/details/17656437 * 4 自定义的XMLRequest和GsonRequest,请参见: *   http://blog.csdn.net/guolin_blog/article/details/17612763 *  * 学习资料: * http://blog.csdn.net/guolin_blog/article/details/17482165 * Thank you very much * */public class MainActivity extends Activity {	private Context mContext;	private RequestQueue mRequestQueue;	private String mUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";	private ImageView mImageView;	private ImageRequest mImageRequest;	private ImageLoader mImageLoader;	private ImageListener mImageListener;	private NetworkImageView mNetworkImageView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        init();        //volley_ImageRequest();        //volley_ImageLoader();        volley_NetworkImageView();    }        private void init(){    	mContext=this;    	mImageView=(ImageView) findViewById(R.id.imageView);    	mNetworkImageView=(NetworkImageView) findViewById(R.id.networkImageView);    }        //利用ImageRequest为ImageView加载网络图片	private void volley_ImageRequest() {		mRequestQueue = Volley.newRequestQueue(mContext);		mImageRequest = new ImageRequest(			mUrl, 			new Response.Listener
   
    () {			  @Override			  public void onResponse(Bitmap response) {				mImageView.setImageBitmap(response);			}}, 		   0, 		   0, 		   Config.ARGB_8888, 		   new Response.ErrorListener() {			@Override			public void onErrorResponse(VolleyError error) {				System.out.println("获取图片失败,所以加载一个默认图片");				mImageView.setImageDrawable(mContext.getResources().getDrawable(R.drawable.ic_launcher));			}		});		mRequestQueue.add(mImageRequest);	}						//利用ImageLoader为ImageView加载网络图片	private void volley_ImageLoader(){		mRequestQueue = Volley.newRequestQueue(mContext);		mImageLoader=new ImageLoader(mRequestQueue, new ImageCacheImpl());		mImageListener=ImageLoader.getImageListener(mImageView, R.drawable.ic_launcher, R.drawable.ic_launcher);		mImageLoader.get(mUrl, mImageListener);		//mImageLoader.get(mUrl, mImageListener,250,250);	}		//利用LruCache实现图片缓存机制	//请参见:	//http://blog.csdn.net/lfdfhl/article/details/18350601	private class ImageCacheImpl implements ImageCache {		private LruCache
    
      mLruCache;		public ImageCacheImpl() {			int maxSize = 15 * 1024 * 1024;			mLruCache = new LruCache
     
      (maxSize) {				@Override				protected int sizeOf(String key, Bitmap bitmap) {					return bitmap.getRowBytes() * bitmap.getHeight();				}			};		}		@Override		public Bitmap getBitmap(String url) {			return mLruCache.get(url);		}		@Override		public void putBitmap(String url, Bitmap bitmap) {			mLruCache.put(url, bitmap);		}	}						//利用NetworkImageView为ImageView加载网络图片	private void volley_NetworkImageView(){		mRequestQueue = Volley.newRequestQueue(mContext);		mImageLoader=new ImageLoader(mRequestQueue, new ImageCacheImpl());		mNetworkImageView.setDefaultImageResId(R.drawable.ic_launcher);		mNetworkImageView.setErrorImageResId(R.drawable.ic_launcher);		mNetworkImageView.setImageUrl(mUrl, mImageLoader);	}	}
     
    
   

main.xml如下:

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