问题
I'm having a bit of a problem with decodeStream returning null. It seems to be a fairly common problem around, but it's usually pinned down to one of two problems:
- An OutOfMemory exception thrown by attempting to load a large bitmap in it's entirety.
- Attempting to use the same input stream twice.
However, I'm not doing either. The code to run it is simply
stream = new java.net.URL(url).openStream();
Bitmap image = BitmapFactory.decodeStream(stream);
stream.close();
with the URL set to here. image is null after this code is complete. This issue's been driving me completely insane - it works fine on PNGs but seems to fall apart under every BMP I can give it, so any help would be appreciated.
回答1:
Ultimately, the answer was found here, using an InputStream returned by a BufferedHTTPEntity. While it seems needlessly complex, I can only assume that simply getting a stream from the URL object directly doesn't return a stream of the appropriate type, and so it wasn't reading out all the data properly.
Cross-posting the code in case the question is erased:
private static InputStream fetch(String address) throws MalformedURLException,IOException {
HttpGet httpRequest = new HttpGet(URI.create(address) );
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);
InputStream instream = bufHttpEntity.getContent();
return instream;
}
来源：https://stackoverflow.com/questions/23096962/bitmapfactory-decodestream-not-working