Android: Bug with ThreadSafeClientConnManager downloading images

Question

For my current application I collect images from different \"event providers\" in Spain.

  Bitmap bmp=null;
  HttpGet httpRequest = new HttpGet(strURL);

  l         


        

Answer 1

I was having a similar problem, and the root issue was due to timeouts when requesting some images. I switched to using a Background Image Loader and have had no problems since. Hope this helps

Answer 2

HttpURLConnection hConn = null;
        hConn = openHttpConnection(szUrl);

        hConn.setRequestMethod("GET");  
        hConn.setRequestProperty("User-Agent",szUserAgent);
        hConn.setRequestProperty("Accept",szAccept);
        hConn.setRequestProperty("Accept-Charset",szCharset);

        hConn.setInstanceFollowRedirects(true);
        hConn.setUseCaches(true);
        hConn.setChunkedStreamingMode(8*1024);
        hConn.setDoInput(true);
        hConn.setConnectTimeout(60*1000);
        hConn.setReadTimeout(60*1000);
        hConn.connect();


        InputStream bmpIs = hConn.getInputStream();
        BufferedInputStream bmpBis = new BufferedInputStream(bmpIs); 
        Bitmap bmpThumb = null;

        BitmapFactory.Options bfOpt = new BitmapFactory.Options();

        bfOpt.inScaled = true;
        bfOpt.inSampleSize = 2;
        bfOpt.inPurgeable = true;

        bmpThumb = BitmapFactory.decodeStream(bmpBis,null,bfOpt);

        if(bmpThumb == null)
        {
            for(int i=0; i<10; i++)
            {
                Thread.sleep(200);
                System.gc();

                bmpThumb = BitmapFactory.decodeStream(bmpBis,null,bfOpt);


                if(bmpThumb == null)
                    bfOpt.inSampleSize += 1;
                else
                    break;
            }
        }

Answer 3

I had the exact same problem when trying to decode an image from a byte array. After some experimentation, the solution appears to be to assign some temp storage in the Options of the BitmapFactory. Try:

Options options = new Options();
options.inTempStorage = new byte[256];
Bitmap newMapBitmap = BitmapFactory.decodeStream(instream, null, options);

If the problem is not resolved straight away, try increasing the size of the temp array. I think large bitmap files need a larger buffer for decoding.

Answer 4

HttpGet httpRequest = null;
try {
  httpRequest = new HttpGet(url);
} catch (Exception e) {
  e.printStackTrace();
}
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);
HttpEntity entity = response.getEntity();
BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity); 
InputStream instream = bufHttpEntity.getContent();
Bitmap bm = BitmapFactory.decodeStream(instream);

Answer 5

I experience this error “SkImageDecoder::Factory returned null” about 1 out of 8 times, even if I download the entire file to a buffer, then decode the byte array to a bitmap. I tried the following and none worked for me:

• Using only URLs, not http connection types
• Buffered readers
• Download entire file, then do decode

I don’t believe the flushed input stream workaround would work either. It does appear to be an Android skia bug. People are still reporting problems here: http://code.google.com/p/android/issues/detail?id=6066. I have no workaround for this bug except to retry if the bitmap is null, which only reduces the chances of getting the error.