title: Display an indexed image from res/raw
body: <p><p> I want to display one of the images stored on res/raw folder. The matter is that the android path of my image is "R.raw.fx", with x and index (like f1, f25,...), and I don't know what will be this index. So i want to sort of append "f" and my index to store the image on a ImageView.
  <p> Any guess how i can do that ? (not the ImageView part :) ofc)
  <p> thank you in advance.</p>