Question

This is my code… I am getting exception NULL at imageBitmap = BitmapFactory.decodeStream(is2,null, options);

First time it can decode but why now, decodeStream throwing null ?

 public void showImageThumb(FileInputStream is)
        {
            final int IMAGE_MAX_SIZE = 100;
            FileInputStream is2 = is;
            BitmapFactory.Options options=new BitmapFactory.Options();
            options.inSampleSize = 4;
            Bitmap imageBitmap = BitmapFactory.decodeStream(is,null, options);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int height = options.outHeight;
            int width = options.outWidth;
            int scale = 1;
            if ( height > IMAGE_MAX_SIZE || width > IMAGE_MAX_SIZE) 
            {
                 scale = (int)Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(options.outHeight, options.outWidth)) / Math.log(0.5)));
            }
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            options = new BitmapFactory.Options();
            options.inSampleSize = scale*2;
            imageBitmap = BitmapFactory.decodeStream(is2,null, options);
            height = options.outHeight;
            width = options.outWidth;
            imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos); //ERROR HERE 
            imageSelectedThumb = baos.toByteArray();

Answer 1

you get a nullpointer exception because you are copying the

is

reference in

is2

so when you close is, you are closing is2 too. Instead of assing is to is2 you have to create a new InpustStream