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;
 }
 
}