title: Button's size and positions
body: <p>I'm designing a simple UI for a calculator: some buttons and a text field for input/output view. I use a relative layout (in order to put the buttons at the bottom of the layout) but they don't occupy all the entire screen so with devices with big screens the buttons are really small. If I use linear layout I can occupy all the spaces but I can't put them in their positions. </p>
  
  <p>Any suggestions?</p>
  
  <p>Thank you very much.</p>