Android Universal Image Loader java.io.FileNotFoundException: http:/xxx/lxx/xxxx.jpg

前段时间在使用ImageLoader异步加载服务端返回的图片时总是出现

java.io.FileNotFoundException: http://xxxx/l046/10046137034b1c0db0.jpg



at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)



at com.nostra13.universalimageloader.core.download.URLConnectionImageDownloader.getStreamFromNetwork(URLConnectionImageDownloader.java:40)



at com.nostra13.universalimageloader.core.download.ImageDownloader.getStream(ImageDownloader.java:27)



at com.nostra13.universalimageloader.core.LoadAndDisplayImageTask.saveImageOnDisc(LoadAndDisplayImageTask.java:296)



at com.nostra13.universalimageloader.core.LoadAndDisplayImageTask.tryLoadBitmap(LoadAndDisplayImageTask.java:204)



at com.nostra13.universalimageloader.core.LoadAndDisplayImageTask.run(LoadAndDisplayImageTask.java:128)



at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)

这样的异常。

刚开始没明白怎么回事，于是就开始疯狂的google。最后终于在stackoverflow发下了这个问题的解决方案。这是原文http://stackoverflow.com/questions/14305765/filenotfoundexception-with-universal-image-loader

 

出现这个错误的原因是：服务端使用的是Apache 提供的开源组件HttpGet和HttpPost。而ImageLoader默认使用的是java再带的原生组件URLHttpConnection。因此在接收和发送数据时会出现解析异常。

解决办法：Android客户端在初始化ImageLoader时将默认的URLHttpConnection改为DefaultHttpClient。

主要代码：

ImageLoaderConfiguration config =

                new ImageLoaderConfiguration

                        .Builder(MainActivity.sharedMainActivity.getApplicationContext())

                        .defaultDisplayImageOptions(defaultOptions)

                        .discCache(new UnlimitedDiscCache(cacheDir))

                        .threadPoolSize(1)

                        .memoryCache(new WeakMemoryCache())

                        .imageDownloader(new HttpClientImageDownloader(new DefaultHttpClient(manager, params)))

                        .build();

完整初始化代码：

HttpParams params = new BasicHttpParams();

        // Turn off stale checking. Our connections break all the time anyway,

        // and it's not worth it to pay the penalty of checking every time.

        HttpConnectionParams.setStaleCheckingEnabled(params, false);

        // Default connection and socket timeout of 10 seconds. Tweak to taste.

        HttpConnectionParams.setConnectionTimeout(params, 10 * 1000);

        HttpConnectionParams.setSoTimeout(params, 10 * 1000);

        HttpConnectionParams.setSocketBufferSize(params, 8192);



        // Don't handle redirects -- return them to the caller. Our code

        // often wants to re-POST after a redirect, which we must do ourselves.

        HttpClientParams.setRedirecting(params, false);

        // Set the specified user agent and register standard protocols.

        HttpProtocolParams.setUserAgent(params, "some_randome_user_agent");

        SchemeRegistry schemeRegistry = new SchemeRegistry();

        schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));

        schemeRegistry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));



        ClientConnectionManager manager = new ThreadSafeClientConnManager(params, schemeRegistry);





        ImageLoaderConfiguration config =

                new ImageLoaderConfiguration

                        .Builder(MainActivity.sharedMainActivity.getApplicationContext())

                        .defaultDisplayImageOptions(defaultOptions)

                        .discCache(new UnlimitedDiscCache(cacheDir))

                        .threadPoolSize(1)

                        .memoryCache(new WeakMemoryCache())

                        .imageDownloader(new HttpClientImageDownloader(new DefaultHttpClient(manager, params)))

                        .build();