title: How to anchor a button in scrollview?
body: <p>i don't know what is it called, so I'll explain and maybe someone could help me to figure it out.  </p>
  
  <p>I have a scroll view with text.<br>
  Those are objective questions.<br>
  What I want to do is to put a small Button on the left bottom corner of the screen, so that I am able to scroll the text but the Button should remain fixed at that position.<br>
  It is like when the user is reading the questions and if he/she wants the answer he/she just clicks the Button and gets the answer.<br>
  I can put a Button in a LinearLayout, but I don't want the Button to be outside the scroll view.<br>
  It should be inside the ScrollView but has to remain fixed. </p>
  
  <p>Please give me some direction. </p>