初识Volley

Posted 2020-08-10

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     } 

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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     }  

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