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flutter - 关闭导航器时出现颤振错误

问题描述

使用不包含 Navigator 的上下文请求的 Navigator 操作

完整代码在这里

class _MyAppState extends State<MyApp> {
   @override
   Widget build(BuildContext context) {
     return new MaterialApp(
       home: new Scaffold(
         drawer: new Drawer(child: new ListView(
           children: <Widget>[
               new DrawerHeader(

                 decoration:BoxDecoration(

                   color: Colors.blue
                 ),
                 child: new Container(
                   child: new Text("Hearer name"),

                 ),),
               new ListTile(
                 title: new Text("pop1"),

                 onTap: (){Navigator.pop(context);},
               ),
               new ListTile(
                 title: new Text("pop2"),
                 onTap: (){Navigator.pop(context);},
               ),


             new Container(
               padding: const EdgeInsets.all(20.0),
               child: new Text("asdsad"),
               decoration: BoxDecoration(
                 color: Colors.grey
               ),
             ), new ListTile(
                 title: new Text("pop4"),
                 onTap: (){Navigator.pop(context);},
               ),
             new Container(
               padding: const EdgeInsets.all(20.0),
               child: new Text("opt2"),
             ), new Container(
               padding: const EdgeInsets.all(20.0),
               child:
                   new Text("Asdsa"),




             ),




           ],
         ),),
         appBar: new AppBar(
           title: new Text("Hi , i am milla"),

         ),
         body: new Center(
           child: new ListView(
             shrinkWrap: true,
             padding: const EdgeInsets.all(20.0),
             children: <Widget>[
               new ProductItem("orange"),


             ],
           )
         ),
       ),
     );
   }

完整的错误代码

：══╡由手势抓住的例外╞═════════════════════════════════════════ ══════════════════════════ I/flutter（3551）：处理手势时抛出以下断言：I/flutter（3551）：使用不包含 Navigator 的上下文请求的 Navigator 操作。I/flutter (3551)：用于从 Navigator 推送或弹出路由的上下文必须是作为 I/flutter (3551) 的小部件的上下文：Navigator 小部件的后代。I/flutter (3551): I/flutter (3551): 当异常被抛出时，这是堆栈：I/flutter (3551): #0
Navigator.of。(包:flutter/src/widgets/navigator.dart:1179:9) I/flutter (3551):

1 Navigator.of (package:flutter/src/widgets/navigator.dart:1186:6) I/flutter (3551):

2 Navigator.pop (package:flutter/src/widgets/navigator.dart:1072:22) I/flutter (

3551）：#3 _MyAppState.build。(file:///project/flutter_app_2/lib/main.dart:31:38) I/flutter (3551):

4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:494:14) I/flutter (3551):

5 _InkResponseState.build。(package:flutter/src/material/ink_well.dart:549:30) I/flutter (3551):

6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24) I/flutter (

3551): #7 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9) I/flutter (3551): #8
TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart: 123:7) I/flutter (3551): #9
GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27) I/flutter (3551):

10 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20) I/flutter (3551):

11 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22) I/flutter (3551):

12 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7) I/flutter (3551):

13 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue

(包:flutter/src/gestures/binding.dart:64:7) I/flutter (3551):

14 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket

(包:flutter/src/gestures/binding.dart:48:7) I/flutter (3551):

15 _invoke1 (dart:ui/hooks.dart:134:13) I/flutter (3551): #16 _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5) I/flutter (3551): I/flutter (3551 ): 处理程序: onTap I/flutter (3551):

识别器：I/flutter（3551）：
TapGestureRecognizer#a8d39(debugOwner: GestureDetector, state: ready, won arena, finalPosition: I/flutter (3551): Offset(51.9, 239.7), sent tap down) I/flutter (3551): ════════ ══════════════════════════════════════════════════ ══════════════════════════════════════════════551╕：引发异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551): 另一个异常被抛出：使用不包含 Navigator 的上下文请求的 Navigator 操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。I/flutter (3551)：引发另一个异常：使用不包含导航器的上下文请求导航器操作。D/EGL_emulation(3551): eglMakeCurrent: 0xa84052a0: ver 2 0 (tinfo 0xa84032d0) 失去与设备的连接。

标签： flutterflutter-layout

解决方案

我认为这段代码可能会对您有所帮助。

在抽屉屏幕中：

drawer: new Drawer(
      child: new Column(
        children: <Widget>[
          new DrawerHeader(
            child: new Container(
              child: new Text("Hearer name"),
            ),
          ),
          new Flexible(
            child: new ListView.builder(
              itemCount: 1,
              itemBuilder: (BuildContext context, int index) {
                return new ListTile(
                  title: new Text("Tap $index"),
                  onTap: () => Navigator.of(context).pop(),
                );
              },
            ),
          )
        ],
      ),
    ),

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