android–decodeStream返回null

概述我正在尝试采用bitmapresizing教程–唯一的区别是我使用decodeStream而不是decodeResource.这很奇怪,但是没有任何 *** 作的decodeStream给了我一个位图obj,但是当我通过decodeSampledBitmapFromStream时它会因某种原因返回null.我如何解决它？这是我使用的代码：protectedHandler

我正在尝试采用bitmap resizing教程 – 唯一的区别是我使用decodeStream而不是decodeResource.这很奇怪,但是没有任何 *** 作的decodeStream给了我一个位图obj,但是当我通过decodeSampledBitmapFromStream时它会因某种原因返回null.
我如何解决它 ？

这是我使用的代码：

protected Handler _onPromoBlocksLoad = new Handler() {        @OverrIDe        public voID dispatchMessage(Message msg) {            PromoBlocksContainer c = (PromoBlocksContainer) _promoBlocksFactory.getResponse();            httpRequest request = new httpRequest(c.getPromoBlocks().get(0).getSmallthumbnail());            BitmapFactory.Options options = new BitmapFactory.Options();            options.inJustDecodeBounds = true;            inputStream stream;            ImageVIEw v = (ImageVIEw) findVIEwByID(R.ID.banner);            try {                stream = request.getStream();                //v.setimageBitmap(BitmapFactory.decodeStream(stream)); Works fine                Bitmap img = decodeSampledBitmapFromStream(stream, v.getWIDth(), v.getHeight());                v.setimageBitmap(img);            } catch (IOException e1) {                // Todo auto-generated catch block                e1.printstacktrace();            }        }    };    public static int calculateInSampleSize(BitmapFactory.Options options, int reqWIDth, int reqHeight) {        final int height = options.outHeight;        final int wIDth = options.outWIDth;        int inSampleSize = 1;        if (height > reqHeight || wIDth > reqWIDth) {            if (wIDth > height) {                inSampleSize = Math.round((float)height / (float)reqHeight);            } else {                inSampleSize = Math.round((float)wIDth / (float)reqWIDth);            }        }        return inSampleSize;    }    public static Bitmap decodeSampledBitmapFromStream(inputStream res, int reqWIDth, int reqHeight) {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeStream(res, null, options);        options.inSampleSize = calculateInSampleSize(options, reqWIDth, reqHeight);        options.inJustDecodeBounds = false;        Bitmap img =  BitmapFactory.decodeStream(res, null, options); // Gives  null         return img;    }

解决方法:

问题是,一旦你使用了来自httpUrlConnection的inputStream,你就不能再回放并再次使用相同的inputStream.因此,您必须为图像的实际采样创建新的inputStream.否则我们必须中止http请求.

request.abort();

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