getResources (). getDrawable (R.drawable.my_icon) obsolete, how to proceed

Hello, I'm having problems with the fact that getDrawable is deprecated. Why, how can I convert my code so that it can be updated? Thank you in advance!

int height = 100;
    int width = 100;
    BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.mipmap.guardian_ico);
    Bitmap b=bitmapdraw.getBitmap();
    Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);