title: LayoutInflater, Open layout with activity within RelativeLayout
body: <p>I have a "Tools.java" that shows "tools.xml" correct? Within this "tools.xml" RelativeLayout have a layout id = @+/contentLayout that is empty.</p>
  
  <p>And I have several other activits "tool1.java", "tools2.java" ... that shows "tool1.xml", "tool2.xml" ...</p>
  
  <p>How to call the class "tool1.java" for example and have it show the "tool1.xml" within the RelativeLayout that is in "tools.xml"</p>
  
  <p>Thanks</p>