title: Possible to re-use a Fragment instance across multiple Activities?
body: <p>If I add a <code>Fragment</code> instance to <code>Activity</code> <code>A</code> as follows...</p>
  
  <pre><code>getSupportFragmentManager()
    .beginTransaction()
    .add(R.id.fragment_container, myFragment, "MY_FRAGMENT_TAG")
    .commit();
  </code></pre>
  
  <p>... And then I start <code>Activity</code> <code>B</code> on top of <code>Activity</code> <code>A</code>. Is it possible (?) to get a handle on the previously committed <code>Fragment</code> instance in <code>Activity</code> <code>B</code> something as follows...</p>
  
  <pre><code>getSupportFragmentManager()
    .findFragmentByTag("MY_FRAGMENT_TAG");
  </code></pre>
  
  <p>... This returns <code>null</code> so I wonder if this is possible using the approach above or otherwise??</p>