fToast.init(yourNavKey.currentContext!); not working in v8.2.1

[aneeskA]

Flutter 3.7.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision b06b8b2710 (4 weeks ago) • 2023-01-23 16:55:55 -0800
Engine • revision b24591ed32
Tools • Dart 2.19.0 • DevTools 2.20.1

GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
...
      return MaterialApp(
        navigatorKey: navigatorKey,

and then

FToast fToast = FToast();
...
  @override
  void initState() {
    super.initState();
    fToast.init(navigatorKey.currentContext!);
  }

With this, while calling fToast.showToast( fails with

VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: Error: Overlay is null.
      Please don't use top of the widget tree context (such as Navigator or MaterialApp) or
      create overlay manually in MaterialApp builder.
      More information
        - https://github.com/ponnamkarthik/FlutterToast/issues/393
        - https://github.com/ponnamkarthik/FlutterToast/issues/234

What am I doing wrong?

[ponnamkarthik]

MaterialApp(
    builder: FToastBuilder(),
    home: MyApp(),
    navigatorKey: navigatorKey,
),

have you added builder: FToastBuilder(), in MaterialApp

[aneeskA]

No I haven't! Thanks a lot.

[aneeskA]

Ok. This solved the problem I was facing. Thanks. I am very new to Flutter so some of the internals are not known to me yet. On a button click I do Navigator.push and then when I come back to this page I do a Navigator.pop. After this, FToast will crash with the same error as before.

Error: Overlay is null.

[aneeskA]

I see this in the source code

    /// To prevent exception "Looking up a deactivated widget's ancestor is unsafe."
    /// which can be thrown if context was unmounted (e.g. screen with given context was popped)

[aneeskA]

And mounted is false.

[aneeskA]

I am trying to read up on overlays. Cannot find any direct relation to navigator.pop messing up overlay stacks. Any pointers here would be great.

[WaseekSenju]

@aneeskA It says in doc:

@override
void initState() {
    super.initState();
    fToast = FToast();
    // if you want to use context from globally instead of content we need to pass navigatorKey.currentContext!
    fToast.init(context);
}

So You can create a global key in your main.dart.

final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();

and then in initState of your widget

  void initState() {
    super.initState();
    fToast = FToast();
    fToast.init(navigatorKey.currentContext!);
  }

I hope this helps.