本地缓存

package com.itheima.zhbj74.utils;

 

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

 

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Bitmap.CompressFormat;

import android.os.Environment;

 

/**

* 本地缓存

*

* @author Kevin

* @date 2015-10-24

*/

public class LocalCacheUtils {

 

private static final String LOCAL_CACHE_PATH = Environment

.getExternalStorageDirectory().getAbsolutePath() + "/zhbj74_cache";

 

// 写本地缓存

public void setLocalCache(String url, Bitmap bitmap) {

File dir = new File(LOCAL_CACHE_PATH);

if (!dir.exists() || !dir.isDirectory()) {

dir.mkdirs();// 创建文件夹

}

 

try {

String fileName = MD5Encoder.encode(url);

 

File cacheFile = new File(dir, fileName);

 

bitmap.compress(CompressFormat.JPEG, 100, new FileOutputStream(

cacheFile));// 参1:图片格式;参2:压缩比例0-100; 参3:输出流

} catch (Exception e) {

e.printStackTrace();

}

}

 

// 读本地缓存

public Bitmap getLocalCache(String url) {

try {

File cacheFile = new File(LOCAL_CACHE_PATH, MD5Encoder.encode(url));

 

if (cacheFile.exists()) {

Bitmap bitmap = BitmapFactory.decodeStream(new FileInputStream(

cacheFile));

return bitmap;

}

 

} catch (Exception e) {

e.printStackTrace();

}

 

return null;

}

 

}