【Android】图片缓存管理工具类

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/**

* @author intbird@163.com

* @time 20140606

*/

package com.intbird.utils;

import java.io.File;

import com.yilake.store.FileHelper;

import android.graphics.Bitmap;

import android.os.Environment;

import android.util.LruCache;

public class CacheManager {

//单例

private static CacheManager cacheInstance;

//内存缓存大小

private final int MEMO_CACHE_SIZE=((int)(Runtime.getRuntime().maxMemory()/1024));

//文件缓存大小

private final int DISK_CACHE_SIZE=1024*1024*100;

//内存缓存

private LruCache<String,Bitmap> mMemoryCache;

//文件缓存

private DiskLruCache mDiskLruCache;

private String cacheUrl="";

public CacheManager() {

//内存缓存

mMemoryCache=new LruCache<String, Bitmap>(MEMO_CACHE_SIZE){

protected int sizeOf(String key, Bitmap bitmap) {

return bitmap.getByteCount()/1024;

};

};

//文件缓存

setBitmapFileCacheDir(FileHelper.DISK_CACHE_FILEDIR);

}

/**

* 获取单例

* @return

*/

public static CacheManager getInstance() {

if(cacheInstance==null){

cacheInstance=new CacheManager();

}

return cacheInstance;

}

/**

* 设置缓存目录;

* @param cacheDir

*/

public void setBitmapFileCacheDir(String cacheDir){

File cacheFile= getDiskFileCache(cacheDir);

cacheUrl=cacheFile.getAbsolutePath();

mDiskLruCache=DiskLruCache.openCache(cacheFile, DISK_CACHE_SIZE);

}

/**

* 返回缓存目录路径

* @return

*/

public String getBitmapFileCacheDir(){

return cacheUrl;

}

//通用外部调用

public void addBitmapToCache(String fileUrl, Bitmap bitmap) {

addBitmapToMemory(fileUrl,bitmap);

addBitmapToDisk(fileUrl,bitmap);

}

public Bitmap getBitmapFromCache(String key){

Bitmap bmp=null;

bmp=getBitmapFromMemory(key);

if(bmp==null){

bmp=getBitmapFromDisk(key);

}

return bmp;

}

/**

* 图片加入内存缓存

* @param key

* @param bitmap

*/

private void addBitmapToMemory(String key,Bitmap bitmap){

if(getBitmapFromMemory(key)==null){

mMemoryCache.put(key, bitmap);

}

}

/**

* 获取内存缓存图片

* @param key

* @return

*/

private Bitmap getBitmapFromMemory(String key){

return mMemoryCache.get(key);

}

/**

* 将图片加入文件缓存

* @param key

* @param bitmap

*/

private void addBitmapToDisk(String key,Bitmap bitmap){

if (mDiskLruCache != null && mDiskLruCache.get(key) == null) {

mDiskLruCache.put(key, bitmap);

}

}

/**

* 从文件缓存中获取图片

* @param key

* @return

*/

private Bitmap getBitmapFromDisk(String key){

if (mDiskLruCache != null) {

return mDiskLruCache.get(key);

}

return null;

}

/**

* 获取缓存目录

* @return

*/

public static File getDiskFileCache(String cacheDir){

String cachePath =Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||

!Environment.isExternalStorageRemovable() ?

Environment.getExternalStorageDirectory().getPath():

Environment.getDataDirectory().getPath();

File file =new File(cachePath + File.separator + cacheDir);

if(!file.exists()) file.mkdir();

return file;

}

}

转自：http://blog.csdn.net/intbird/article/details/38338713