ImageMemoryCache.java

package cn.com.scitc.swl.rssnews.tools;

import android.content.Context;
import android.graphics.Bitmap;
import android.util.LruCache;

public class ImageMemoryCache {

	private LruCache<String, Bitmap> mMemoryCache;

	public ImageMemoryCache(Context context) {
		// Get max available VM memory, exceeding this amount will throw an
		// OutOfMemory exception. Stored in kilobytes as LruCache takes an
		// int in its constructor.
		final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

		// Use 1/8th of the available memory for this memory cache.
		final int cacheSize = maxMemory / 8;

		mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
			@Override
			protected int sizeOf(String key, Bitmap bitmap) {
				// The cache size will be measured in kilobytes rather than
				// number of items.
				return bitmap.getByteCount() / 1024;
			}
		};
	}

	public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
		if (getBitmapFromMemCache(key) == null) {
			mMemoryCache.put(key, bitmap);
		}
	}

	public Bitmap getBitmapFromMemCache(String key) {
		return mMemoryCache.get(key);
	}
}