title: Varying font sizes when using different .ttf fonts with no change to the sp
body: <p><strong>Problem:</strong> When implementing a custom font I notice quite a big change in the font size. (Without any altering to the font size in the XML file)</p>
  
  <p>This is causing a significant variation between the Actual font size in comparison to the size shown in the Graphical layout in ADT. (Visually about 20sp smaller)</p>
  
  <p>I am building a timer application and want to use a Digital Looking font.</p>
  
  <p><strong>Question:</strong> Can a .ttf file affect the font size relative to a constant 'sp' ?</p>