Question

There’s say some ImageView object. I want to read bits/raw data of this object as InputStream. How to do that?

Answer 1

First get background image of the ImageView as an object of Drawable:

iv.getBackground();

Then convert Drawable image into Bitmap using

BitmapDrawable bitDw = ((BitmapDrawable) d);
Bitmap bitmap = bitDw.getBitmap();

Now use ByteArrayOutputStream to get the Bitmap into a Stream and get bytearray[]; then
convert the bytearray into a ByteArrayInputStream.

You can use the following code to get InputStream from ImageView.

Full Source code

ImageView iv = (ImageView) findViewById(R.id.splashImageView);
Drawable d = iv.getBackground();
BitmapDrawable bitDw = ((BitmapDrawable) d);
Bitmap bitmap = bitDw.getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] imageInByte = stream.toByteArray();
System.out.println("........length......" + imageInByte);
ByteArrayInputStream bis = new ByteArrayInputStream(imageInByte);

Thanks
Deepak