title: Android fragment is not updating
body: <p>I have a TextView into a fragment. When i update the text property from the activity, the component is not updated on fragment.</p>
  
  <pre><code>TextView amountTag = (TextView) fm.findFragmentByTag("currentFrag").getView().findViewById(R.id.amountTag);
  amountTag.setText("another text");
  </code></pre>
  
  <p><code>fm</code> variable is my <code>FragmentManager</code>.</p>
  
  <p>I already tried to detach and attach the fragment again. But it does not work.</p>