NoSuchMethodError: The method 'hide' was called on null.

[ryanhz]

Thank you for such a fantastic package. I spot an exception:

NoSuchMethodError: The method 'hide' was called on null.
Receiver: null
Tried calling: hide()
#0 NotificationEntry.dismiss (package:overlay_support/src/overlay_entry.dart:22)
#1 showOverlay.. (package:overlay_support/src/overlay.dart:43)
#2 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:988)
#3 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleBeginFrame. (package:flutter/src/scheduler/binding.dart:904)

[boyan01]

Which lib and flutter version are you using?

[Goolpe]

I have the same issue on
overlay_support: 0.1.0
flutter: 1.5.8

[boyan01]

i will try to figure out the cause, but it will be very helpful if you can provide specific code .

[Goolpe]

if I use separate funcs:

NotificationEntry entry;
Column(
  mainAxisAlignment: MainAxisAlignment.center,
  children: <Widget>[
    RaisedButton(
      color: Colors.red,
      child: Text('show'),
      onPressed: (){
        entry = showSimpleNotification(context,
          const Text('Load video'),
          elevation: 0,
          autoDismiss: false);
      },
    ),
    RaisedButton(
      color: Colors.green,
      child: Text('dismiss'),
      onPressed: (){
        entry.dismiss();
      },
    )
  ]
)

works fine, but if in one function like:

NotificationEntry entry;
RaisedButton(
  color: Colors.red,
  child: Text('show'),
  onPressed: (){
    entry = showSimpleNotification(context,
      const Text('Load video'),
      elevation: 0,
      autoDismiss: false);
    entry.dismiss();
  },
),

get error

[boyan01]

i think this should be a wrong use case, because we should not dismiss notification immediately when we popup a notification into screen.

but this also should be a problem, I only add protect logic for autoDismiss :

overlay_support/lib/src/overlay.dart

Line 42 in 2aedf6d

WidgetsBinding.instance

thanks for the information, i will fix this in next version.

[ryanhz]

Sorry, coming back late.

How I use:

First, because I used another library before, so here is a wrap function:

void showToast({@required BuildContext context, String title, @required String message, Duration duration = const Duration(seconds: 3)}) {
    toast(context, message, duration: duration);
}

Then use it like:

showToast(message: "doing something successfully", duration: Duration(seconds: 2));
Navigator.pop(context, true);

So I think the Navigator.pop(context, true); should screw the status of the overlay.

[boyan01]

in normally use case, Navigator.pop does not affect the status of Overlay, because the Overlay is a application level Widget.

is that you used one of Overlay,WidgetsApp or MaterialApp widget in a single page?

[ryanhz]

So that is weird. I use MaterialApp as root widget tree.

[boyan01]

maybe i found the cause, i guess you used ReorderableListView or something wrapped a Overlay widget.