Listening events got 'dispose' was called on null or NoSuchMethodError

[simolus3]

Listening events got 'dispose' was called on null or NoSuchMethodError

[simolus3]

Can you post the web3dart-related stacktrace of the exception? Thanks.
Btw., the await subscription.asFuture() and .take(1) were added to the example so that it only listens to one event and terminates after that. If you want to listen for events continuously, I recommend removing the await subscription.asFuture() and .take(1) lines. (This exception is still a bug in the library and unrelated to that)

[liuyuejiang]

I/flutter ( 7931): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 7931): The following NoSuchMethodError was thrown while finalizing the widget tree:
I/flutter ( 7931): The method 'dispose' was called on null.
I/flutter ( 7931): Receiver: null
I/flutter ( 7931): Tried calling: dispose()
I/flutter ( 7931):
I/flutter ( 7931): When the exception was thrown, this was the stack:
I/flutter ( 7931): #0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:50:5)
I/flutter ( 7931): #1      _LightDetailPageState.dispose 
package:newuicontrollor/…/devices/lightdetail.dart:230
I/flutter ( 7931): #2      StatefulElement.unmount 
package:flutter/…/widgets/framework.dart:3916
I/flutter ( 7931): #3      _InactiveElements._unmount 
package:flutter/…/widgets/framework.dart:1697
I/flutter ( 7931): #4      _InactiveElements._unmount.<anonymous closure> 

[simolus3]

Ah, I see it now. When the network is "Public", you do

final client = Web3Client(httpUrl, Client(), socketConnector: () {
        return IOWebSocketChannel.connect(wsUrl).cast<String>();
});

This declares the client as a local variable, so just remove the final and you're good.

I think the long delay is caused by infura, I'm not sure if anything can be done against that. If I find out more I'll let you know.