title: How to dispose of my Stateful Widget completely?
body: <p>I call my stateful widget page and get some info from the server. If no info found it warns the user that there isn't any info.
  From the drawer back button, I go back to the previous page. If I keep repeat back and forth very fast I get an error on console message in my IntelliJ IDE as;</p>
  
  <pre><code>E/flutter (22681): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception:
  E/flutter (22681): setState() called after dispose(): _BillsPayWaterState#66be5(lifecycle state: defunct, not mounted)
  E/flutter (22681): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback. The preferred solution is to cancel the timer or stop listening to the animation in the dispose of the () callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
  E/flutter (22681): This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose of ().
  E/flutter (22681): #0      State.setState.&lt;anonymous closure&gt; 
  </code></pre>
  
  <p>In my statefull widget I have <code>@override void initState()</code> and I also have <code>@override void dispose()</code> </p>
  
  <p>My question is when I use the drawer back button, How can I dispose of my Stateful Widget completely?</p>
  
  <p><strong>This is the call for widget</strong></p>
  
  <pre><code>onTap: () {
  Navigator.push(
    context,
    SlideRightRoute(widget: new BillsWaterPay(“S02")),
  );
  }
  </code></pre>
  
  <p><strong>And this the BillsWaterPay widget</strong></p>
  
  <pre><code>List&lt;List&lt;dynamic&gt;&gt; _userAskBills;
  
  // TODO: KURUM KODU - SABIT TELEFON
  String _kurumKodu = "";
  String _noDataText = "";
  
  class BillsWaterPay extends StatefulWidget {
    final String title;
  
    BillsWaterPay(this.title);
  
    @override
    _BillsWaterPayState createState() =&gt;
        _BillsWaterPayState();
  }
  
  class _BillsWaterPayState extends State&lt;BillsWaterPay&gt; {
  
    @override
    void initState() {
      // TODO: implement initState
      super.initState();
      _kurumKodu = widget.title;
      _userAskBills;
      _noDataText;
      _loadEverything();
  }
  
  Future _loadEverything() async {
      await _getDataFromServer();
  }
  
  Future _getDataFromServer() async() {
      …
      …
      if no data
          setState
              _noDataText = “No Data”;  // In here I get an error setState called after dispose
  
  }
  
  
  @override
  void dispose() {
    super.dispose();
        _kurumKodu = widget.title;
      _userAskBills;
      _noDataText;
  }
  </code></pre>