滚动控制器颤动错误发生异常

Question

滚动控制器颤动错误发生异常

我有两个屏幕，第一个从 wordpress 获取所有帖子，最后一个获取所有视频，我使用带有 ListView 的 ScollController 滚动数据

看看我的代码：

ScrollController _scrollController;

@override
  void initState() {
    _scrollController = new ScrollController();
    _scrollController.addListener(() {
      print(_scrollController.position.pixels);
      if (_scrollController.position.pixels ==
          _scrollController.position.maxScrollExtent - 10) {
        // if we are the bottom of the page
        fetchPosts();
        //millisecs += 1500;
        //super.initState();
      }
      super.initState();
    });
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) { ....

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当我在屏幕一到两个或屏幕二到一之间切换时

我收到此错误：

    Exception has occurred.
FlutterError (A ScrollController was used after being disposed.
Once you have called dispose() on a ScrollController, it can no longer be used.)

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跟踪代码：图像错误

Launching lib\main.dart on Android SDK built for x86 in debug mode... Built build\app\outputs\apk\debug\app-debug.apk. D/EGL_emulation( 8157): eglMakeCurrent: 0xeeebd340: ver 3 1 (tinfo 0xeee9b1d0) E/eglCodecCommon( 8157): glUtilsParamSize: unknow param 0x000082da E/eglCodecCommon( 8157): glUtilsParamSize: unknow param 0x000082da I/Choreographer( 8157): Skipped 49 frames! The application may be doing too much work on its main thread. D/EGL_emulation( 8157): eglMakeCurrent: 0xeef21ce0: ver 3 1 (tinfo 0xe6f286b0) D/ ( 8157): HostConnection::get() New Host Connection established 0xe7123880, tid 8184 D/EGL_emulation( 8157): eglMakeCurrent: 0xeeebd340: ver 3 1 (tinfo 0xe7103370) I/flutter ( 8157): _morePages: false I/flutter ( 8157): statusCode: 200 I/flutter ( 8157): ??? EXCEPTION CAUGHT BY FOUNDATION LIBRARY ????????????????????????????????????????????????????????? I/flutter ( 8157): The following assertion was thrown while dispatching notifications for ScrollController: I/flutter ( 8157): 'package:flutter/src/widgets/framework.dart': Failed assertion: line 1003 pos 12: I/flutter ( 8157): '_debugLifecycleState == _StateLifecycle.created': is not true. I/flutter ( 8157): I/flutter ( 8157): Either the assertion indicates an error in the framework itself, or we should provide substantially I/flutter ( 8157): more information in this error message to help you determine and fix the underlying cause. I/flutter ( 8157): In either case, please report this assertion by filing a bug on GitHub: I/flutter ( 8157): https://github.com/flutter/flutter/issues/new?template=BUG.md I/flutter ( 8157): I/flutter ( 8157): 当抛出异常时，这是堆栈： I/flutter ( 8157): #2 State.initState (package:flutter/src/widgets/framework.dart: 1003:12) I/flutter (8157)：#3 _PostsPage.initState。(package:flutter_wp2019/ui/PostsLatest.dart:42:13) I/flutter (8157): #4 ChangeNotifier.notifyListeners (package:flutter/src/foundation/change_notifier.dart:208:21) I/flutter (8157) : #5 ChangeNotifier.notifyListeners (package:flutter/src/foundation/change_notifier.dart:208:21) I/flutter (8157): #6 ScrollPosition.notifyListeners (package:flutter/src/widgets/scroll_position.dart:692: 11) I/flutter (8157): #7 ScrollPosition.setPixels (package:flutter/src/widgets/scroll_position.dart:218:9) I/flutter (8157): #8 ScrollPositionWithSingleContext.setPixels (package:flutter/src/widgets/scroll_position_with_single_context.dart:84:18) I/flutter (8157): #9 ScrollPositionWithSingleContext.applyUserOffset (package:flutter/src/widgets/scroll_position_with_single_context.dart:84:18) ) I/flutter (8157): #10 ScrollDragController.update (package:flutter/src/widgets/scroll_activity.dart:373:14) I/flutter (8157): #11 ScrollableState._handleDragUpdate (package:flutter/src/widgets/scroll_activity.dart:373:14) /scrollable.dart:470:12) I/flutter (8157): #12 DragGestureRecognizer.acceptGesture。(package:flutter/src/gestures/monodrag.dart:176:48) I/flutter (8157): #13 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24) I/flutter ( 8157）：#14 DragGestureRecognizer.acceptGesture（包：ui/hooks.dart:168:13) I/flutter (8157): #28 _dispatchPointerDataPacket (dart:ui/hooks.dart:122:5) I/flutter (8157):（从 _AssertionError 类中删除了 2 帧）I/ flutter ( 8157): I/flutter ( 8157): ScrollController 发送通知是: I/flutter ( 8157): ScrollController#bcc47(one client, offset 21.4) I/flutter (8157): ???????? ?????????????????????????????????????????????????????? ????????????????????????????????????????????? I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': is not true。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 16 行 I/flutter (8157): 抛出另一个异常：'package: flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': 不是真的。I/zygote（8157）：做部分代码缓存收集，代码=29KB，数据=23KB I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：失败的断言：行1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': 不是真的。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 1 行 I/flutter (8157): 抛出另一个异常：'package:flutter/src/widgets/framework.dart': Failed断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。I/zygote（8157）：代码缓存收集后，code=29KB，data=23KB I/zygote（8157）：将代码缓存容量增加到 128KB I/flutter (8157)：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：失败的断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：是不对。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 11 行 I/flutter (8157): 抛出另一个异常：'package:flutter/src/widgets/framework.dart': Failed断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。I/zygote（8157）：做部分代码缓存采集，code=59KB，data=40KB I/zygote（8157）：代码缓存采集后，code=59KB，data=40KB I/zygote（8157）：增加代码缓存容量到 256KB I/颤振（8157）：30.00837053571422 I/颤振（8157）：抛出了另一个异常：'package:flutter/src/widgets/framework.dart': Failed assertion: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': is not true。I/flutter (8157): 42.86551339285711 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart': 失败的断言：line 1003 pos 12: '_debugLifecycleState. == _State : 不是真的。I/flutter (8157): 55.72265625 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created' : 不是真的。I/flutter (8157): 71.41741071428567 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework. dart'：失败的断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。I/flutter (8157): 88.56863839285711 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugLifecycleState.=='State : 不是真的。I/flutter（8157）：105.71986607142856 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/flutter（8157）：120.24285714285713 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行pos 12：' _debugLifecycleState == _StateLifecycle.created': 不是真的。I/flutter（8157）：117.38013392857141 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/flutter（8157）：110.24843749999997 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/flutter (8157): 93.09720982142858 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart': 失败的断言：line 1003 pos 12: '_debugLifecycleState. == _State ：不是真的。I/flutter (8157): 63.0888392857143 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugLifecycleState. == _StateLifecycleState : 不是真的。I/flutter (8157): 23.11116071428569 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart': 失败的断言：line 1003 pos 12: '_debugLifecycleState. == _State : 不是真的。I/flutter (8157): 0.0 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created' : 不是真的。我/颤振（8157）：1。4313616071428896 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。I/flutter (8157): 8.58816964285711 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState. == _StateLifecycleState : 不是真的。I/flutter（8157）：24.006696428571445 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/颤振（8157）：41.15792410714289 I/颤振（8157）：抛出了另一个异常：'package:flutter/src/widgets/framework.dart': Failed assertion: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': is not true。I/flutter (8157): 64.00948660714289 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugLifecycleState.=='State : 不是真的。I/flutter (8157): 85.4296875 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created' : 不是真的。I/flutter (8157): 108.28125 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart' ：失败的断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。I/flutter (8157): 120.24285714285713 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugStateLifecycleState. == _create_dart : 不是真的。I/flutter（8157）：2.8376116071428896 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/flutter（8157）：7.131696428571445 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行pos 12：' _debugLifecycleState == _StateLifecycle.created': 不是真的。I/flutter (8157): 11.42578125 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created' : 不是真的。I/flutter（8157）：18.557477678571445 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.=='created : 不是真的。I/flutter (8157): 24.28292410714289 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugLifecycleState. == _State : 不是真的。I/flutter（8157）：39.977678571428555 I/flutter（8157）：抛出另一个异常：'package:flutter/src/widgets/framework.dart'：断言失败：第1003行位置12：'_debugStateLifecycleState.==' : 不是真的。I/flutter (8157): 57.12890625 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created' : 不是真的。I/flutter (8157): 77.14285714285717 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugLifecycleState.=='State : 不是真的。I/颤振（8157）：97.13169642857144 I/颤振（8157）：抛出了另一个异常：'package:flutter/src/widgets/framework.dart': Failed assertion: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle.created': is not true。I/flutter (8157): 115.71428571428572 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart': 失败的断言：line 1003 pos 12: '_debugStateLifecycleState. == _create_dart : 不是真的。I/flutter (8157): 120.24285714285713 I/flutter (8157): 另一个异常被抛出：'package:flutter/src/widgets/framework.dart'：失败的断言：line 1003 pos 12：'_debugStateLifecycleState. == _create_dart : 不是真的。I/flutter (8157): _morePages: false I/flutter (8157): statusCode: 200 I/flutter (8157): _morePages: false I/flutter (8157): statusCode: 400 I/flutter (8157): 另一个异常被抛出: 'package:flutter/src/widgets/framework.dart': 失败的断言: line 1003 pos 12: '_debugLifecycleState == _StateLifecycle .created': 不是真的。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 22 行 I/flutter (8157): 抛出另一个异常：'package:flutter/src/widgets/framework.dart': Failed断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。我/颤振（8157）：_morePages：假我/颤振（8157）：状态代码：200 _debugLifecycleState == _StateLifecycle.created': 不是真的。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 22 行 I/flutter (8157): 抛出另一个异常：'package:flutter/src/widgets/framework.dart': Failed断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。我/颤振（8157）：_morePages：假我/颤振（8157）：状态代码：200 _debugLifecycleState == _StateLifecycle.created': 不是真的。I/chatty (8157): uid=10083(com.example.flutterwp2019) 1.ui 相同 22 行 I/flutter (8157): 抛出另一个异常：'package:flutter/src/widgets/framework.dart': Failed断言：第 1003 行 pos 12：'_debugLifecycleState == _StateLifecycle.created'：不是真的。我/颤振（8157）：_morePages：假我/颤振（8157）：状态代码：200

图像错误

感谢提前

Answer 1

Gün*_*uer 5

super.initState() 在错误的位置

@override
  void initState() {
    super.initState(); // <<< added

    _scrollController = new ScrollController();
    _scrollController.addListener(() {
      print(_scrollController.position.pixels);
      if (_scrollController.position.pixels ==
          _scrollController.position.maxScrollExtent - 10) {
        // if we are the bottom of the page
        fetchPosts();
        //millisecs += 1500;
        //super.initState();
      }
      // super.initState(); // <<< removed
    });

  }

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