android 图片缓存
来源：互联网 发布：廖雪峰python下载 编辑：程序博客网 时间：2024/06/11 05:56
原理示意图
主体有三个，分别是UI，缓存模块和数据源（网络）。它们之间的关系如下：
① UI：请求数据，使用唯一的Key值索引Memory Cache中的Bitmap。
② 内存缓存：缓存搜索，如果能找到Key值对应的Bitmap，则返回数据。否则执行第三步。
③ 硬盘存储：使用唯一Key值对应的文件名，检索SDCard上的文件。
④ 如果有对应文件，使用BitmapFactory.decode*方法，解码Bitmap并返回数据，同时将数据写入缓存。如果没有对应文件，执行第五步。
⑤ 下载图片：启动异步线程，从数据源下载数据(Web)。
⑥ 若下载成功，将数据同时写入硬盘和缓存，并将Bitmap显示在UI中。
目前比较主流的图片缓存框架
Glide和Picasso都是非常完美的库。Glide加载图像以及磁盘缓存的方式都要优于Picasso，速度更快，并且Glide更有利于减少OutOfMemoryError的发生，GIF动画是Glide的杀手锏。不过Picasso的图片质量更高。Universal Image Loader：一个强大的图片加载库，包含各种各样的配置，最老牌，使用也最广泛。
其中内存缓存主要是通过LRUCache实现的。讲到LruCache不得不提一下LinkedHashMap，因为LruCache中Lru算法的实现就是通过LinkedHashMap来实现的。LinkedHashMap继承于HashMap，它使用了一个双向链表来存储Map中的Entry顺序关系，这种顺序有两种，一种是LRU顺序，一种是插入顺序，这可以由其构造函数public LinkedHashMap(int initialCapacity,float loadFactor, boolean accessOrder)指定。所以，对于get、put、remove等操作，LinkedHashMap除了要做HashMap做的事情，还做些调整Entry顺序链表的工作。LruCache中将LinkedHashMap的顺序设置为LRU顺序来实现LRU缓存，每次调用get(也就是从内存缓存中取图片)，则将该对象移到链表的尾端。调用put插入新的对象也是存储在链表尾端，这样当内存缓存达到设定的最大值时，将链表头部的对象（近期最少用到的）移除。
package com.example.renlei.myapplication.imageload.myimageload;import android.graphics.Bitmap;import android.util.Log;import android.util.LruCache;/** * Created by renlei * DATE: 16/6/28 * Time: 15:53 */public class MemoryCache { public static LruCache<String, Bitmap> mMemoryCache; public static void init() { int maxSize = (int) (Runtime.getRuntime().maxMemory() / 1024); int cacheSize = maxSize / 8; if (mMemoryCache == null){ mMemoryCache = new LruCache<String, Bitmap>(cacheSize) { @Override protected int sizeOf(String key, Bitmap value) { return value.getByteCount() / 1024; } }; } } public static synchronized void addToMemory(String key, Bitmap bitmap) { if (key != null && bitmap != null) { Log.d("BitmapCaChe", "addToMemory" + "key" + DiskCache.getFilepath(key)); Log.d("BitmapCaChe", "size" + mMemoryCache.size() + "map"); mMemoryCache.put(DiskCache.getFilepath(key), bitmap); } } public static synchronized Bitmap getMemory(String key) { if (mMemoryCache != null && key != null){ Log.d("BitmapCaChe", "getMemory" + "key" + DiskCache.getFilepath(key) + "从缓存中进行加载"); return mMemoryCache.get(DiskCache.getFilepath(key)); } return null; }}磁盘缓存主要就是将从网络获取的图片存到本地中
package com.example.renlei.myapplication.imageload.myimageload;import android.text.TextUtils;import android.util.Log;import com.example.renlei.myapplication.MyApplication;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;/** * Created by renlei * DATE: 16/6/29 * Time: 15:21 */public class DiskCache { private volatile static DiskCache instance; public static DiskCache getInstance() { if (instance == null) { synchronized (DiskCache.class) { if (instance == null) { instance = new DiskCache(); } } } return instance; } private static String cachePath; static { cachePath = MyApplication.getContext().getExternalCacheDir() + "/img"; File file = new File(cachePath); file.mkdirs(); } public boolean save(String imgUrl, InputStream inputStream) { if (TextUtils.isEmpty(imgUrl) || inputStream == null) { return false; } String filePath = getFilepath(imgUrl); File file = new File(filePath); FileOutputStream fos = null; try { if (!file.exists()) { file.createNewFile(); } fos = new FileOutputStream(file); byte[] buffer = new byte[1024]; int n; while ((n = inputStream.read(buffer)) != -1) { fos.write(buffer, 0, n); } } catch (IOException e) { e.printStackTrace(); } finally { try { inputStream.close(); fos.close(); } catch (IOException e) { e.printStackTrace(); } } Log.d("DiskCache", "save disk" + " " + filePath); return true; } public File get(String imgUrl) { String filePath = getFilepath(imgUrl); File file = new File(filePath); if (file.exists()) { Log.d("DiskCache", "get disk" + " " + filePath); return file; } return null; } public static String getFilepath(String url) { if (url.contains("/")) { String[] urls = url.split("/"); return cachePath + File.separator + urls[urls.length - 1]; } return url; }}Listview的 Adapterpackage com.example.renlei.myapplication.imageload.myimageload;import android.content.Context;import android.graphics.Bitmap;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import com.example.renlei.myapplication.R;import com.example.renlei.myapplication.baseandroid.chapterfour.BitmapCache;import com.example.renlei.myapplication.baseandroid.chapterfour.BitmapTask;import java.util.ArrayList;import java.util.List;/** * Created by renlei * DATE: 16/6/28 * Time: 14:36 */public class MyImageLoadAdapter extends BaseAdapter { LayoutInflater inflater; Context mContext; int length; public MyImageLoadAdapter(Context mContext) { this.mContext = mContext; inflater = LayoutInflater.from(mContext); } @Override public int getCount() { return ImageUrlConstant.imgUrls.length; } @Override public Object getItem(int position) { return ImageUrlConstant.imgUrls[position]; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder viewHolder; if (convertView == null) { convertView = inflater.inflate(R.layout.image_load_item, null); viewHolder = new ViewHolder(convertView); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } ImageLoad.loadImage(viewHolder.iv,ImageUrlConstant.imgUrls[position],null); return convertView; } static class ViewHolder { ImageView iv; public ViewHolder(View rootView) { iv = (ImageView) rootView.findViewById(R.id.iv); } }}ImageLoad加载的核心类
主要思想是，先从缓存中查找图片，如果没有的话，就从磁盘中查找，如果磁盘中也没有的话，就需要从网页中进行下载
package com.example.renlei.myapplication.imageload.myimageload;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.text.TextUtils;import android.util.Log;import android.widget.ImageView;import com.example.renlei.myapplication.R;import java.util.concurrent.LinkedBlockingDeque;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;/** * Created by renlei * DATE: 16/6/29 * Time: 15:18 */public class ImageLoad { private static ThreadPoolExecutor poolExecutor = new ThreadPoolExecutor(3, 5, 30, TimeUnit.SECONDS, new LinkedBlockingDeque<Runnable>(10), new RejectDone()); static class RejectDone extends ThreadPoolExecutor.AbortPolicy { @Override public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {// super.rejectedExecution(r, e);// Log.d(TAG, ((ThreadPoolTask) r).taskName + "被阻止"); } } public static void loadImage(ImageView iv, String url, BitmapFactory.Options options) { if (iv == null) { return; } if (TextUtils.isEmpty(url)) { iv.setImageResource(R.mipmap.ic_launcher); return; } /** * 从缓存中进行读取 */ Bitmap memoryBitmap = MemoryCache.getMemory(url); if (memoryBitmap != null) { Log.d("ImageLoad", "从缓存中进行加载"); iv.setImageBitmap(memoryBitmap); return; } /** * 缓存中没有，设置默认图 */ iv.setImageResource(R.mipmap.ic_launcher); iv.setTag(url);//设置tag防止错位 /** * 从硬盘中查询 */ poolExecutor.execute(new ImageLoadTask(url,iv)); }}其中要注意必须要给ImageView设置一个Tag，否则的话会出现图片错位以及跳跃的现象。可以参考android listview 异步加载图片并防止错位
用来下载图片以及展示图片的异步任务
package com.example.renlei.myapplication.imageload.myimageload;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.text.TextUtils;import android.util.Log;import android.widget.ImageView;import java.io.File;import java.net.HttpURLConnection;import java.net.URL;/** * Created by renlei * DATE: 16/6/29 * Time: 16:23 */public class ImageLoadTask implements Runnable { String imaUrl; ImageView mIV; DiskCache diskCache = DiskCache.getInstance(); public ImageLoadTask(String imaUrl, ImageView imageView) { this.imaUrl = imaUrl; mIV = imageView; } @Override public void run() { Log.d("ImageLoad", "ImageLoadTaskRun"); if (TextUtils.isEmpty(imaUrl)) { return; } File file = diskCache.get(imaUrl); if (file != null) {///瓷盘中有从磁盘中加载 Log.d("ImageLoad", "从瓷盘中加载"); final Bitmap bitmap = decodeFileToBitmap(file); if (mIV.getTag() != null && mIV.getTag().equals(imaUrl)) { mIV.post(new Runnable() { @Override public void run() { mIV.setImageBitmap(bitmap); } }); } MemoryCache.addToMemory(imaUrl, bitmap); } else {//否则从网络上下载 Log.d("ImageLoad", "从网络上下载"); HttpURLConnection connection; URL url; try { url = new URL(imaUrl); connection = (HttpURLConnection) url.openConnection(); connection.setReadTimeout(3000); connection.setDoInput(true); connection.setRequestMethod("GET"); connection.connect(); if (connection.getResponseCode() == 200) { /* 同一个stream只能读取一次 InputStream inputStream = connection.getInputStream(); final Bitmap bitmap = BitmapFactory.decodeStream(connection.getInputStream()); if (mIV.getTag() != null && mIV.getTag().equals(imaUrl)) { mIV.post(new Runnable() { @Override public void run() { mIV.setImageBitmap(bitmap); } }); } MemoryCache.addToMemory(imaUrl, bitmap); DiskCache.getInstance().save(imaUrl, connection.getInputStream());*/ DiskCache.getInstance().save(imaUrl, connection.getInputStream()); final Bitmap bitmap = decodeFileToBitmap(DiskCache.getInstance().get(imaUrl)); if (mIV.getTag() != null && mIV.getTag().equals(imaUrl)) { mIV.post(new Runnable() { @Override public void run() { mIV.setImageBitmap(bitmap); } }); } MemoryCache.addToMemory(imaUrl,bitmap); connection.disconnect(); } } catch (Exception e) { e.printStackTrace(); } finally { } } } private Bitmap decodeFileToBitmap(File file) { Bitmap bitmap = BitmapFactory.decodeFile(file.getPath()); return bitmap; }}图片资源 从Universal Image Loader中获取的
package com.example.renlei.myapplication.imageload.myimageload;import com.example.renlei.myapplication.R;/** * Created by renlei * DATE: 16/6/29 * Time: 15:14 */public class ImageUrlConstant { public static String [] imgUrls = new String[]{ "https://lh6.googleusercontent.com/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s1024/A%252520Photographer.jpg", "https://lh4.googleusercontent.com/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s1024/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg", "https://lh5.googleusercontent.com/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s1024/Another%252520Rockaway%252520Sunset.jpg", "https://lh3.googleusercontent.com/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s1024/Antelope%252520Butte.jpg", "https://lh6.googleusercontent.com/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s1024/Antelope%252520Hallway.jpg", "https://lh4.googleusercontent.com/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s1024/Antelope%252520Walls.jpg", "https://lh6.googleusercontent.com/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s1024/Apre%2525CC%252580s%252520la%252520Pluie.jpg", "https://lh3.googleusercontent.com/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s1024/Backlit%252520Cloud.jpg", "https://lh5.googleusercontent.com/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s1024/Bee%252520and%252520Flower.jpg", "https://lh5.googleusercontent.com/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s1024/Bonzai%252520Rock%252520Sunset.jpg", "https://lh6.googleusercontent.com/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s1024/Caterpillar.jpg", "https://lh3.googleusercontent.com/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s1024/Chess.jpg", "https://lh5.googleusercontent.com/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s1024/Chihuly.jpg", "https://lh5.googleusercontent.com/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s1024/Closed%252520Door.jpg", "https://lh3.googleusercontent.com/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s1024/Colorado%252520River%252520Sunset.jpg", "https://lh3.googleusercontent.com/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s1024/Colors%252520of%252520Autumn.jpg", "https://lh4.googleusercontent.com/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s1024/Countryside.jpg", "https://lh4.googleusercontent.com/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s1024/Death%252520Valley%252520-%252520Dunes.jpg", "https://lh6.googleusercontent.com/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s1024/Delicate%252520Arch.jpg", "https://lh5.googleusercontent.com/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s1024/Despair.jpg", "https://lh5.googleusercontent.com/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s1024/Eagle%252520Fall%252520Sunrise.jpg", "https://lh3.googleusercontent.com/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s1024/Electric%252520Storm.jpg", 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"https://lh6.googleusercontent.com/-74Z5qj4bTDE/URqu6LSrJrI/AAAAAAAAAbs/XzmVkw90szQ/s1024/Orchid.jpg", "https://lh6.googleusercontent.com/-lEQE4h6TePE/URqu6t_lSkI/AAAAAAAAAbs/zvGYKOea_qY/s1024/Over%252520there.jpg", "https://lh5.googleusercontent.com/-cauH-53JH2M/URqu66v_USI/AAAAAAAAAbs/EucwwqclfKQ/s1024/Plumes.jpg", "https://lh3.googleusercontent.com/-eDLT2jHDoy4/URqu7axzkAI/AAAAAAAAAbs/iVZE-xJ7lZs/s1024/Rainbokeh.jpg", "https://lh5.googleusercontent.com/-j1NLqEFIyco/URqu8L1CGcI/AAAAAAAAAbs/aqZkgX66zlI/s1024/Rainbow.jpg", "https://lh5.googleusercontent.com/-DRnqmK0t4VU/URqu8XYN9yI/AAAAAAAAAbs/LgvF_592WLU/s1024/Rice%252520Fields.jpg", "https://lh3.googleusercontent.com/-hwh1v3EOGcQ/URqu8qOaKwI/AAAAAAAAAbs/IljRJRnbJGw/s1024/Rockaway%252520Fire%252520Sky.jpg", "https://lh5.googleusercontent.com/-wjV6FQk7tlk/URqu9jCQ8sI/AAAAAAAAAbs/RyYUpdo-c9o/s1024/Rockaway%252520Flow.jpg", "https://lh6.googleusercontent.com/-6cAXNfo7D20/URqu-BdzgPI/AAAAAAAAAbs/OmsYllzJqwo/s1024/Rockaway%252520Sunset%252520Sky.jpg", "https://lh3.googleusercontent.com/-sl8fpGPS-RE/URqu_BOkfgI/AAAAAAAAAbs/Dg2Fv-JxOeg/s1024/Russian%252520Ridge%252520Sunset.jpg", "https://lh6.googleusercontent.com/-gVtY36mMBIg/URqu_q91lkI/AAAAAAAAAbs/3CiFMBcy5MA/s1024/Rust%252520Knot.jpg", "https://lh6.googleusercontent.com/-GHeImuHqJBE/URqu_FKfVLI/AAAAAAAAAbs/axuEJeqam7Q/s1024/Sailing%252520Stones.jpg", "https://lh3.googleusercontent.com/-hBbYZjTOwGc/URqu_ycpIrI/AAAAAAAAAbs/nAdJUXnGJYE/s1024/Seahorse.jpg", "https://lh3.googleusercontent.com/-Iwi6-i6IexY/URqvAYZHsVI/AAAAAAAAAbs/5ETWl4qXsFE/s1024/Shinjuku%252520Street.jpg", "https://lh6.googleusercontent.com/-amhnySTM_MY/URqvAlb5KoI/AAAAAAAAAbs/pFCFgzlKsn0/s1024/Sierra%252520Heavens.jpg", "https://lh5.googleusercontent.com/-dJgjepFrYSo/URqvBVJZrAI/AAAAAAAAAbs/v-F5QWpYO6s/s1024/Sierra%252520Sunset.jpg", "https://lh4.googleusercontent.com/-Z4zGiC5nWdc/URqvBdEwivI/AAAAAAAAAbs/ZRZR1VJ84QA/s1024/Sin%252520Lights.jpg", "https://lh4.googleusercontent.com/-_0cYiWW8ccY/URqvBz3iM4I/AAAAAAAAAbs/9N_Wq8MhLTY/s1024/Starry%252520Lake.jpg", "https://lh3.googleusercontent.com/-A9LMoRyuQUA/URqvCYx_JoI/AAAAAAAAAbs/s7sde1Bz9cI/s1024/Starry%252520Night.jpg", "https://lh3.googleusercontent.com/-KtLJ3k858eY/URqvC_2h_bI/AAAAAAAAAbs/zzEBImwDA_g/s1024/Stream.jpg", "https://lh5.googleusercontent.com/-dFB7Lad6RcA/URqvDUftwWI/AAAAAAAAAbs/BrhoUtXTN7o/s1024/Strip%252520Sunset.jpg", "https://lh5.googleusercontent.com/-at6apgFiN20/URqvDyffUZI/AAAAAAAAAbs/clABCx171bE/s1024/Sunset%252520Hills.jpg", "https://lh4.googleusercontent.com/-7-EHhtQthII/URqvEYTk4vI/AAAAAAAAAbs/QSJZoB3YjVg/s1024/Tenaya%252520Lake%2525202.jpg", "https://lh6.googleusercontent.com/-8MrjV_a-Pok/URqvFC5repI/AAAAAAAAAbs/9inKTg9fbCE/s1024/Tenaya%252520Lake.jpg", "https://lh5.googleusercontent.com/-B1HW-z4zwao/URqvFWYRwUI/AAAAAAAAAbs/8Peli53Bs8I/s1024/The%252520Cave%252520BW.jpg", "https://lh3.googleusercontent.com/-PO4E-xZKAnQ/URqvGRqjYkI/AAAAAAAAAbs/42nyADFsXag/s1024/The%252520Fisherman.jpg", "https://lh4.googleusercontent.com/-iLyZlzfdy7s/URqvG0YScdI/AAAAAAAAAbs/1J9eDKmkXtk/s1024/The%252520Night%252520is%252520Coming.jpg", "https://lh6.googleusercontent.com/-G-k7YkkUco0/URqvHhah6fI/AAAAAAAAAbs/_taQQG7t0vo/s1024/The%252520Road.jpg", "https://lh6.googleusercontent.com/-h-ALJt7kSus/URqvIThqYfI/AAAAAAAAAbs/ejiv35olWS8/s1024/Tokyo%252520Heights.jpg", "https://lh5.googleusercontent.com/-Hy9k-TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s1024/Tokyo%252520Highway.jpg", "https://lh6.googleusercontent.com/-83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s1024/Tokyo%252520Smog.jpg", "https://lh3.googleusercontent.com/-FB-jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s1024/Tufa%252520at%252520Night.jpg", "https://lh4.googleusercontent.com/-vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s1024/Valley%252520Sunset.jpg", "https://lh6.googleusercontent.com/-DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s1024/Windmill%252520Sunrise.jpg", "https://lh5.googleusercontent.com/-biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s1024/Windmill.jpg", "https://lh4.googleusercontent.com/-PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s1024/Windmills.jpg", "https://lh5.googleusercontent.com/-kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s1024/Yet%252520Another%252520Rockaway%252520Sunset.jpg", "https://lh4.googleusercontent.com/-e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s1024/Yosemite%252520Tree.jpg", // Light images "http://tabletpcssource.com/wp-content/uploads/2011/05/android-logo.png", "http://simpozia.com/pages/images/stories/windows-icon.png", "http://radiotray.sourceforge.net/radio.png", "http://www.bandwidthblog.com/wp-content/uploads/2011/11/twitter-logo.png", "http://weloveicons.s3.amazonaws.com/icons/100907_itunes1.png", "http://weloveicons.s3.amazonaws.com/icons/100929_applications.png", "http://www.idyllicmusic.com/index_files/get_apple-iphone.png", "http://www.frenchrevolutionfood.com/wp-content/uploads/2009/04/Twitter-Bird.png", "http://3.bp.blogspot.com/-ka5MiRGJ_S4/TdD9OoF6bmI/AAAAAAAAE8k/7ydKtptUtSg/s1600/Google_Sky%2BMaps_Android.png", "http://www.desiredsoft.com/images/icon_webhosting.png", "http://goodereader.com/apps/wp-content/uploads/downloads/thumbnails/2012/01/hi-256-0-99dda8c730196ab93c67f0659d5b8489abdeb977.png", "http://1.bp.blogspot.com/-mlaJ4p_3rBU/TdD9OWxN8II/AAAAAAAAE8U/xyynWwr3_4Q/s1600/antivitus_free.png", "http://cdn3.iconfinder.com/data/icons/transformers/computer.png", "http://cdn.geekwire.com/wp-content/uploads/2011/04/firefox.png?7794fe", "https://ssl.gstatic.com/android/market/com.rovio.angrybirdsseasons/hi-256-9-347dae230614238a639d21508ae492302340b2ba", "http://androidblaze.com/wp-content/uploads/2011/12/tablet-pc-256x256.jpg", "http://www.theblaze.com/wp-content/uploads/2011/08/Apple.png", "http://1.bp.blogspot.com/-y-HQwQ4Kuu0/TdD9_iKIY7I/AAAAAAAAE88/3G4xiclDZD0/s1600/Twitter_Android.png", "http://3.bp.blogspot.com/-nAf4IMJGpc8/TdD9OGNUHHI/AAAAAAAAE8E/VM9yU_lIgZ4/s1600/Adobe%2BReader_Android.png", "http://cdn.geekwire.com/wp-content/uploads/2011/05/oovoo-android.png?7794fe", "http://icons.iconarchive.com/icons/kocco/ndroid/128/android-market-2-icon.png", "http://thecustomizewindows.com/wp-content/uploads/2011/11/Nicest-Android-Live-Wallpapers.png", "http://c.wrzuta.pl/wm16596/a32f1a47002ab3a949afeb4f", "http://macprovid.vo.llnwd.net/o43/hub/media/1090/6882/01_headline_Muse.jpg", // Special cases "http://cdn.urbanislandz.com/wp-content/uploads/2011/10/MMSposter-large.jpg", // Very large image "http://www.ioncannon.net/wp-content/uploads/2011/06/test9.webp", // WebP image "http://4.bp.blogspot.com/-LEvwF87bbyU/Uicaskm-g6I/AAAAAAAAZ2c/V-WZZAvFg5I/s800/Pesto+Guacamole+500w+0268.jpg", // Image with "Mark has been invalidated" problem "file:///sdcard/Universal Image Loader @#&=+-_.,!()~'%20.png", // Image from SD card with encoded symbols "assets://Living Things @#&=+-_.,!()~'%20.jpg", // Image from assets "drawable://" + R.mipmap.ic_launcher, // Image from drawables "http://upload.wikimedia.org/wikipedia/ru/b/b6/Как_кот_с_мышами_воевал.png", // Link with UTF-8 "https://www.eff.org/sites/default/files/chrome150_0.jpg", // Image from HTTPS "http://bit.ly/soBiXr", // Redirect link "http://img001.us.expono.com/100001/100001-1bc30-2d736f_m.jpg", // EXIF "", // Empty link "http://wrong.site.com/corruptedLink", // Wrong link };}参考资料
http://www.cnblogs.com/kissazi2/p/3931400.html
Android 三大缓存图片原理，特性对比 http://www.trinea.cn/android/android-image-cache-compare/
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