初识Volley

ImageLoader异步加载图片

 1 /**
 2      * 异步加载图片
 3      */
 4     private void loadImageByVolley(){
 5         String imageUrl="http://www.taopic.com/uploads/allimg/120421/107063-12042114025737.jpg";
 6         RequestQueue requestQueue = Volley.newRequestQueue(this);
 7
 8         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(20);
 9         ImageCache imageCache = new ImageCache() {
10
11             @Override
12             public void putBitmap(String key, Bitmap value) {
13                 lruCache.put(key, value);
14             }
15
16             @Override
17             public Bitmap getBitmap(String key) {
18                 return lruCache.get(key);
19             }
20         };
21         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
22
23         //三个参数分别是imageView组件，默认图片，加载失败图片
24         ImageListener listener = ImageLoader.getImageListener(iv, R.drawable.ic_launcher,0);
25         imageLoader.get(imageUrl, listener);
26     } 

NetworkImageView显示网络图片

 1 /**
 2      * 使用NetworkImageView显示网络图片,代替传统的ImageView
 3      */
 4     private void showImageByNetworkImageView(){
 5         String imageUrl="http://avatar.csdn.net/6/6/D/1_lfdfhl.jpg";
 6         RequestQueue requestQueue = Volley.newRequestQueue(this);
 7         final LruCache<String, Bitmap> lruCache = new LruCache<String, Bitmap>(20);
 8         ImageCache imageCache = new ImageCache() {
 9             @Override
10             public void putBitmap(String key, Bitmap value) {
11                 lruCache.put(key, value);
12             }
13
14             @Override
15             public Bitmap getBitmap(String key) {
16                 return lruCache.get(key);
17             }
18         };
19         ImageLoader imageLoader = new ImageLoader(requestQueue, imageCache);
20         mNetworkImageView.setImageUrl(imageUrl,imageLoader);
21     }