Android中获取网络图片的方法(如果手机缓存里面有就从缓存获取)

http://doinone.iteye.com/blog/1074366

// 如果缓存里面有就从缓存获取，否则网络获取图片，返回Drawable对象public static Drawable loadImageFromNetwork(Context context, String imageUrl){Drawable drawable = null;if(imageUrl == null )return null;String imagePath = "";String   fileName   = "";// 获取url中图片的文件名与后缀if(imageUrl!=null&&imageUrl.length()!=0){             fileName  = imageUrl.substring(imageUrl.lastIndexOf("/")+1);}// 图片在手机本地的存放路径,注意：fileName为空的情况imagePath = context.getCacheDir() + "/" + fileName;Log.i("test","imagePath = " + imagePath);File file = new File(context.getCacheDir(),fileName);// 保存文件Log.i("test","file.toString()=" + file.toString());if(!file.exists()&&!file.isDirectory()){try {// 可以在这里通过文件名来判断，是否本地有此图片FileOutputStream   fos=new   FileOutputStream( file );InputStream is = new URL(imageUrl).openStream();int   data = is.read(); while(data!=-1){         fos.write(data);         data=is.read();; } fos.close();is.close();//drawable = Drawable.createFromStream(//new URL(imageUrl).openStream(), file.toString() ); // (InputStream) new URL(imageUrl).getContent();drawable = Drawable.createFromPath(file.toString());Log.i("test", "file.exists()不文件存在，网上下载:" + drawable.toString());} catch (IOException e) {Log.d("test", e.getMessage());}}else{drawable = Drawable.createFromPath(file.toString());Log.i("test", "file.exists()文件存在，本地获取");}if (drawable == null) {Log.d("test", "null drawable");} else {Log.d("test", "not null drawable");}return drawable ;}

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