62、LruCache图片缓存

public class ImageCache {

private ImageCache() {
// use 1/8 of available heap size
cache = new LruCache<String, Bitmap>((int) (Runtime.getRuntime().maxMemory() / 8)) {
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
            }
        };
    }

private static ImageCache imageCache = null;

public static synchronized ImageCache getInstance() {
if (imageCache == null) {
imageCache = new ImageCache();
        }
return imageCache;

    }
private LruCache<String, Bitmap> cache = null;

/**
     * put bitmap to image cache
     * @param key
* @param value
* @return  the puts bitmap
     */
public Bitmap put(String key, Bitmap value){
return cache.put(key, value);
    }

/**
     * return the bitmap
     * @param key
* @return
*/
public Bitmap get(String key){
return cache.get(key);
    }
}