title: How to draw with screen pixels
body: <p>I'm developing an android "radar" in which I will show a gps coordinates in my android screen. So I have to convert the latitude and longitude to the pixels (x, y) of the device screen. To do that I though in take the center of the screen like (0, 0) and transform the coordinates of (lat, lng) to my screen pixels (x, y).</p>
  
  <p>The problem is that I dont know how to implement this. I think the idea would sucess but I dont know how the screen works, the pixel coordinates, etc.</p>
  
  <p>Any tips pls?</p>
  
  <p>Thanks</p>