BitmapFactory.decodeStream读取Asset文件出现decoder->decode returned false错误

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BitmapFactory.decodeStream(InputStream is)从Asset文件中读取图像文件时，会出现decoder->decode returned false错误，可能的问题之一是读取的文件类型为jpg格式的，将图片格式转码为gif格式即解决问题。

附1：读取Asset文件(以图像文件为例)的代码：

AssetManager am = ct.getResources().getAssets()；//ct为Android的Activity传入到本class的应用程序的Context

String[] files_list= am.list("trained")； //将Asset文件夹内的"trained"文件夹内的所有的文加名列到files_list内

InputStream IS = am.open("trained/" + "file_name.gif"); //将Asset/trained文件夹内部的file_name.gif文件打开成InputStream 。

Bitmap bm = BitmapFactory.decodeStream(IS);

附2：读取网络文件到Bitmap

HttpClient httpClient = new DefaultHttpClient();

HttpResponse response = httpClient.execute(getMethod, new BasicHttpContext());

HttpEntity entity = response.getEntity();

InputStream is= entity.getContent();

Bitmap bm = BitmapFactory.decodeStream(is);

附3：其他解决decoder->decode returned false错误的链接

http://www.newsmth.net/nForum/#!article/MobileDev/38356

http://stackoverflow.com/questions/3802820/bitmapfactory-decodestream-always-returns-null-and-skia-decoder-shows-decode-ret

http://stackoverflow.com/questions/4339082/android-decoder-decode-returned-false-for-bitmap-download

http://stackoverflow.com/questions/11047224/unable-to-load-jpeg-image-with-bitmapfactory-decodefile-returns-null

http://android-developers.blogspot.com/2010/07/multithreading-for-performance.html

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