Android http 请求 Json数据缓存到内存

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package com.innjoo.store.cache;
import com.ferris.utils.StringUtils;
import android.support.v4.util.LruCache;
/**
 *
 * @ClassName: LruJsonCache json缓存类
 * @Description: TODO
 * @author 重播
 * @email 459821731@qq.com
 * @date 2014-12-27 下午5:33:49
 * @csdn blog.csdn.net/xufeifandj
 */
public class LruJsonCache {
    private LruCache<String, String> mMemoryCache;

    public LruJsonCache() {
        int maxMemory = (int) Runtime.getRuntime().maxMemory() / 10;
        mMemoryCache = new LruCache<String, String>(maxMemory) {
            @Override
            protected int sizeOf(String key, String value) {
                return value.length();
            }
        };
    }

    /**
     *
     * @Title: addJsonToMemoryCache
     * @Description: TODO 添加json内存
     * @return void
     */
    public void addJsonToMemoryCache(String key, String jsonString) {
        if (mMemoryCache == null) {
            return;
        }
        if (StringUtils.isEmpty(key)) {
            return;
        }

        if (getJsonFromMemCache(key) == null && jsonString != null) {
            mMemoryCache.put(key, jsonString);
        }
    }

    /**
     * 从内存缓存中获取一个Json
     * @param key
     * @return
     */
    public String getJsonFromMemCache(String key) {
        if (mMemoryCache == null) {
            return null;
        }
        return mMemoryCache.get(key);
    }
}