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();