LRU——使用

LRU_test.java

	private final BitmapCache mMemoryCache;
	//一般在构造函数实现
	mMemoryCache = new BitmapCache();


		private Bitmap getBitmapFromMemCache(final int key) {
			return mMemoryCache.get(key);
		}

		private void addBitmapToMemoryCache(final int key, final Bitmap bitmap) {
		if (getBitmapFromMemCache(key) == null) {
			mMemoryCache.put(key, bitmap);
			}
		}

		//这是在getview里面实现
		Bitmap bitmap = getBitmapFromMemCache(pos);
		if (bitmap == null) {
			Drawable d = appList.get(pos).appIcon;
			bitmap = ((BitmapDrawable) d).getBitmap();
			addBitmapToMemoryCache(pos, bitmap);
		}