CODEWITHSUNDEEP
flutterdartflutter-layoutflutter-animation
raman raman
raman raman

Reputation: 1821

Flutter: Ticker must be disposed before calling super.dispose()

I don't know why this error is appearing in the console box

Console message:

SplashScreenState created a Ticker via its SingleTickerProviderStateMixin, but at the time dispose() was called on the mixin, that Ticker was still active. The Ticker must be disposed before calling super.dispose(). Tickers used by AnimationControllers should be disposed by calling dispose() on the AnimationController itself. Otherwise, the ticker will leak. The offending ticker was: Ticker(created by SplashScreenState#dae31(lifecycle state: created))

HERE IS MY FULL CODE FOR SPLASHSCREEN:

import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';


class SplashScreen extends StatefulWidget {
  @override
  SplashScreenState createState() => new SplashScreenState();
}

class SplashScreenState extends State<SplashScreen>
    with SingleTickerProviderStateMixin {
  var _visible = true;

  AnimationController animationController;
  Animation<double> animation;

  startTime() async {
    var _duration = new Duration(seconds: 3);
    return new Timer(_duration, navigationPage);
  }

  void navigationPage() {
    Navigator.of(context).pushReplacementNamed(HOME_SCREEN);
  }




  @override
  void initState() {
    super.initState();
    animationController = new AnimationController(
      vsync: this,
      duration: new Duration(seconds: 2),
    );
    animation =
    new CurvedAnimation(parent: animationController, curve: Curves.easeOut);

    animation.addListener(() => this.setState(() {}));
    animationController.forward();

    setState(() {
      _visible = !_visible;
    });
    startTime();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.expand,
        children: <Widget>[

          new Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              new Image.asset(
                'assets/vegan1.png',
                width: animation.value * 280,
                height: animation.value * 280,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

How can I solve this error. Please answer if you have any solution or idea to solve this.only added important points are added reduce the size of code. If you need more console code then please comment.

Upvotes: 38

Views: 40913

Answers (1)

CopsOnRoad
CopsOnRoad

Reputation: 268454

Override dispose method and dispose the AnimationController instance. 

@override
dispose() {
  animationController.dispose(); // you need this
  super.dispose();
}

Upvotes: 121

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