imageView.setDrawingCacheEnabled(true;
Bitmap.createBitmap(imageView.getDrawingCache(), 0, 0,
       imageView.getHeight(), imageView.getWidth(),
       matrix, true).compress(CompressFormat.JPEG, 95,
       new FileOutputStream(file));

Bitmap bmp = ((BitmapDrawable)imageView.getDrawable()).getBitmap();

Bitmap.createBitmap(bmp, 0, 0,
        bmp.getWidth(), bmp.getHeight(),
        matrix, true).compress(CompressFormat.JPEG, 95,
                    new FileOutputStream(file));

Bitmap.createScaledBitmap(Bitmap b, int newWidth, int newHieght, boolean filter);

Bitmap image = BitmapFactory.decodeResource(..)

ImageView.setImageBitmap(Bitmap bm)