title: Changing focus from one text field to the next in Flutter
body: <p>I have two <code>textFormField</code> widgets.  Once the user has completed the first text field I would like to focus on the next <code>textField</code>.  Is there a way to do this in Flutter?  Currently, the done button just closes the keyboard.  I was guessing the <code>focusNode</code> class might be the answer to this but not really sure how that works does anyone have any good examples of focusNode class? Thanks in advance.</p>