oss/MemoryCache.java

package com.easemob.easeui.oss;

import android.graphics.Bitmap;

import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;

public class MemoryCache {
	// ���Ļ����� 
	private static final int MAX_CACHE_CAPACITY = 30;
	private HashMap<String, SoftReference<Bitmap>> mCacheMap =
			new LinkedHashMap<String, SoftReference<Bitmap>>() {
		private static final long serialVersionUID = 1L;
		protected boolean removeEldestEntry(
				Entry<String,SoftReference<Bitmap>> eldest){
			return size() > MAX_CACHE_CAPACITY;};
	};

	public Bitmap get(String id){
		if(!mCacheMap.containsKey(id)) return null;
		SoftReference<Bitmap> ref = mCacheMap.get(id);
		return ref.get();
	}
	public void put(String id, Bitmap bitmap){
		mCacheMap.put(id, new SoftReference<Bitmap>(bitmap));
	}
	public void clear() {
		try {
			for(Map.Entry<String,SoftReference<Bitmap>>entry
					:mCacheMap.entrySet()) 
			{  SoftReference<Bitmap> sr = entry.getValue();
			if(null != sr) {
				Bitmap bmp = sr.get();
				if(null != bmp) bmp.recycle();
			}
			}
			mCacheMap.clear();
		} catch (Exception e) {
			e.printStackTrace();}
	}
}