title: Nesting a button group within a button group in android?
body: <p>i am fairly experienced at coding in java but i am just learning to build graphical user interfaces in android environment. I have searched alot for the answer to this question but i wonder if im not searching for the right thing?</p>
  
  <p>I want to be able to choose between 2 radio buttons, and if the first of these radio buttons is chosen then a group of 2 more radio buttons should be chosen from. Its hard to explain exactly what i mean so i hope this helps.....</p>
  
  <ol>
  <li><p>Choice One</p>
  
  <pre><code>      1.a choice one a
  
        1.b choice one b
  </code></pre></li>
  <li><p>Choice Two</p></li>
  </ol>
  
  <p>So, if 'choice one' is picked then the user MUST pick from choices 1a OR 1b,  whereas if the user picks 'choice two' then the sub options (1a and 1b) are not even available (greyed out i suppose).</p>
  
  <p>I thought i could just nest one RadioGroup inside another, but it doesnt seem to work this way.</p>
  
  <p>If anybody can help me here id be really grateful.</p>