title: Where to put Firebase.setAndroidContext() function
body: <p>I'm trying to play a bit with Firebase and Android.<br>
  I have one <code>RegisterActivity</code>, and one <code>MainActivity</code>.
  My current flow is - start with <code>MainActivity</code> - check if user is registered, if not, call <code>RegisterActivity</code> - after registeration call <code>MainActivity</code>.</p>
  
  <p>I'm having trouble with where to put the <code>Firebase.setAndroidContext()</code> call.<bR>
  I have 2 questions:</p>
  
  <ol>
  <li>Should I only call this function once in <code>Application</code> or once in each <code>Activty</code>?</li>
  <li>If the answer for question 1 is only once, then where should I put it ?</li>
  </ol>
  
  <p>Thank you all,
  Giora.</p>