Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
138 views
in Technique[技术] by (71.8m points)

Android: SkImageDecoder:: Factory returned null

I'm using my localhost to fetch images and to view in an ImageView. For some reason I'm getting Factory returned null error. I've looked through the code many times and I don't see what's wrong. Any help would be appreciated!

GalleryZoom.java

public class Zoom extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.gallery_zoom);

        String selection = getIntent().getExtras().getString("image");
        Toast.makeText(this, selection, Toast.LENGTH_LONG).show();

        new backgroundLoader().execute();       
    }


    private class backgroundLoader extends AsyncTask<Void, Void, Void> {
        Bitmap bmp;

        @Override
        protected Void doInBackground(Void... params) {

            bmp = DecodeBitmapSampleSize(getIntent().getExtras().getString("image"), 48, 64);
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);

            ImageView image = (ImageView) findViewById(R.id.imageZoom);
            image.setImageBitmap(bmp);
        }

    }

    public Bitmap DecodeBitmapSampleSize (String strURL, int reqWidth, int reqHeight) {
        InputStream in = null;
        Bitmap bmp = null;

        in = OpenHttpConnection(strURL);
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(in, null, options);

        options.inSampleSize = calculateSampleSize(options, reqWidth, reqHeight);

        options.inJustDecodeBounds = false;
        bmp = BitmapFactory.decodeStream(in, null, options);
                return bmp;
    }

    private InputStream OpenHttpConnection(String strURL) {

        try {
            URL url = new URL(strURL);

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            InputStream in = new BufferedInputStream(connection.getInputStream());
            return in;
        } catch (Exception exception) {
            exception.printStackTrace();
            return null;
        }
    }

    public static int calculateSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {

        final int width = options.outWidth;
        final int height = options.outHeight;
        int inSampleSize = 1;

        if (width > reqWidth || height > reqHeight) {
            if (width > height) {
                inSampleSize = Math.round((float) height / (float) reqHeight);
            } else {
                inSampleSize = Math.round((float) width / (float) reqWidth);
            }
        }
        return inSampleSize;
    }

}

LogCat Log

08-13 21:55:19.578: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:19.658: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.688: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.708: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:19.708: I/MemoryCache(3197): cache size = 24600, length = 1
08-13 21:55:20.628: I/MemoryCache(3197): cache size = 71600, length = 2
08-13 21:55:20.678: I/MemoryCache(3197): cache size = 101408, length = 3
08-13 21:55:26.228: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:26.228: I/MemoryCache(3197): MemoryCache maximum limit is 6MB
08-13 21:55:26.998: D/skia(3197): --- SkImageDecoder::Factory returned null
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

I have encountered the same problem. And also I make sure the url is correct to download the image. By debugging the code, I found the variable of position in inputstream was set to 1024 after the first decode. So I add inputstream.reset() before the second decode. That works. Hope can help others.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...