Flutter页面跳转报错There are multiple heroes that share the same tag within a subtree.

import 'package:flutter/material.dart';

import 'Page/NewRoute.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Home'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
            FlatButton(
              child: Text("open new route"),
              textColor: Colors.blue,
              onPressed: () {
                //导航到新路由
                Navigator.push(context, MaterialPageRoute(builder: (context) {
                  return NewRoute();
                }));
              },
            ),
          ],
        ),
      ),
      floatingActionButton: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        children: <Widget>[
          FloatingActionButton(
            onPressed: _incrementCounter,
            tooltip: 'Increment',
            foregroundColor: Colors.white,
            backgroundColor: Colors.cyan,
            child: Icon(Icons.exposure_plus_1),
          ),
        ],
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

点击按钮跳转页面就报错

  FlatButton(
              child: Text("open new route"),
              textColor: Colors.blue,
              onPressed: () {
                //导航到新路由
                Navigator.push(context, MaterialPageRoute(builder: (context) {
                  return NewRoute();
                }));
              },
            ),

报错内容：


════════ Exception caught by scheduler library ═════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
There are multiple heroes that share the same tag within a subtree.

Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must have a unique non-null tag.
In this case, multiple heroes had the following tag: <default FloatingActionButton tag>
Here is the subtree for one of the offending heroes:
# Hero(tag: <default FloatingActionButton tag>, state: _HeroState#5a900)
# └SizedBox(renderObject: RenderConstrainedBox#e0670 relayoutBoundary=up6)
#  └Offstage(offstage: false, renderObject: RenderOffstage#d8aa1 relayoutBoundary=up7)
#   └TickerMode(mode: enabled)
#    └KeyedSubtree-[GlobalKey#2e7b4]
#     └Tooltip("decrement", dependencies: [_LocalizationsScope-[GlobalKey#624f7], _InheritedTheme, TickerMode], state: _TooltipState#50e7f(ticker inactive))
#      └GestureDetector(startBehavior: start)
#       └RawGestureDetector(state: RawGestureDetectorState#d9c12(gestures: [long press], excludeFromSemantics: true, behavior: opaque))
#        └Listener
#         └_PointerListener(listeners: [down], behavior: opaque, renderObject: RenderPointerListener#4ab1e relayoutBoundary=up8)
#          └Semantics(container: false, properties: SemanticsProperties, label: "decrement", value: null, hint: null, hintOverrides: null, dependencies: [Directionality], renderObject: RenderSemanticsAnnotations#71fff relayoutBoundary=up9)
#           └RawMaterialButton(state: _RawMaterialButtonState#72b4c)
#            └Semantics(container: true, properties: SemanticsProperties, label: null, value: null, hint: null, hintOverrides: null, renderObject: RenderSemanticsAnnotations#e5b8d relayoutBoundary=up10)
#             └_InputPadding(renderObject: _RenderInputPadding#ea3bd relayoutBoundary=up11)
#              └Focus(dependencies: [_FocusMarker], state: _FocusState#2ef17)
#               └_FocusMarker
#                └ConstrainedBox(BoxConstraints(w=56.0, h=56.0), renderObject: RenderConstrainedBox#953c3 relayoutBoundary=up12)
#                 └Material(type: button, elevation: 6.0, color: MaterialColor(primary value: Color(0xffff9800)), textStyle.debugLabel: (((englishLike button 2014).merge(whiteMountainView button)).copyWith).copyWith, textStyle.inherit: false, textStyle.color: Color(0xffffffff), textStyle.family: Roboto, textStyle.size: 14.0, textStyle.weight: 500, textStyle.letterSpacing: 1.2, textStyle.baseline: alphabetic, textStyle.decoration: TextDecoration.none, shape: CircleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none)), dependencies: [_LocalizationsScope-[GlobalKey#624f7], _InheritedTheme, TickerMode], state: _MaterialState#f3e54)
#                  └_MaterialInterior(duration: 200ms, shape: CircleBorder(BorderSide(Color(0xff000000), 0.0, BorderStyle.none)), elevation: 6.0, color: MaterialColor(primary value: Color(0xffff9800)), shadowColor: Color(0xff000000), dependencies: [_LocalizationsScope-[GlobalKey#624f7], Directionality, _InheritedTheme, TickerMode], state: _MaterialInteriorState#82dfe(ticker inactive))
#                   └PhysicalShape(clipper: ShapeBorderClipper, elevation: 6.0, color: MaterialColor(primary value: Color(0xffff9800)), shadowColor: Color(0xff000000), renderObject: RenderPhysicalShape#f96ad)
#                    └_ShapeBorderPaint(dependencies: [Directionality])
#                     └CustomPaint(renderObject: RenderCustomPaint#22c85)
#                      └NotificationListener<LayoutChangedNotification>
#                       └_InkFeatures-[GlobalKey#f58ae ink renderer](renderObject: _RenderInkFeatures#10c41)
#                        └AnimatedDefaultTextStyle(duration: 200ms, debugLabel: (((englishLike button 2014).merge(whiteMountainView button)).copyWith).copyWith, inherit: false, color: Color(0xffffffff), family: Roboto, size: 14.0, weight: 500, letterSpacing: 1.2, baseline: alphabetic, decoration: TextDecoration.none, softWrap: wrapping at box width, overflow: clip, dependencies: [TickerMode], state: _AnimatedDefaultTextStyleState#07526(ticker inactive))
#                         └DefaultTextStyle(debugLabel: (((englishLike button 2014).merge(whiteMountainView button)).copyWith).copyWith, inherit: false, color: Color(0xffffffff), family: Roboto, size: 14.0, weight: 500, letterSpacing: 1.2, baseline: alphabetic, decoration: TextDecoration.none, softWrap: wrapping at box width, overflow: clip)
#                          └InkWell(gestures: [tap], clipped to BoxShape.rectangle, dependencies: [_FocusMarker], state: _InkResponseState<InkResponse>#2fd92)
#                           └MouseRegion(listeners: [enter, exit], renderObject: RenderMouseRegion#e52ee)
#                            └GestureDetector(startBehavior: start)
#                             └RawGestureDetector(state: RawGestureDetectorState#d53b3(gestures: [tap], behavior: opaque))
#                              └_GestureSemantics(renderObject: RenderSemanticsGestureHandler#94515)
#                               └Listener
#                                └_PointerListener(listeners: [down], behavior: opaque, renderObject: RenderPointerListener#d7e87)
#                                 └Builder(dependencies: [IconTheme])
#                                  └IconTheme(IconThemeData#15fa8(color: Color(0xffffffff)))
#                                   └Container(padding: EdgeInsets.zero)
#                                    └Padding(padding: EdgeInsets.zero, dependencies: [Directionality], renderObject: RenderPadding#35ace)
#                                     └Center(alignment: center, widthFactor: 1.0, heightFactor: 1.0, dependencies: [Directionality], renderObject: RenderPositionedBox#ed513)
#                                      └Icon(IconData(U+0E3CB), dependencies: [Directionality, IconTheme])
#                                       └Semantics(container: false, properties: SemanticsProperties, label: null, value: null, hint: null, hintOverrides: null, renderObject: RenderSemanticsAnnotations#10f97 relayoutBoundary=up1)
#                                        └ExcludeSemantics(excluding: true, renderObject: RenderExcludeSemantics#49a4b relayoutBoundary=up2)
#                                         └SizedBox(width: 24.0, height: 24.0, renderObject: RenderConstrainedBox#ce5bc relayoutBoundary=up3)
#                                          └Center(alignment: center, dependencies: [Directionality], renderObject: RenderPositionedBox#4fd6c)
#                                           └RichText(textDirection: ltr, softWrap: wrapping at box width, overflow: visible, maxLines: unlimited, text: "", dependencies: [_LocalizationsScope-[GlobalKey#624f7]], renderObject: RenderParagraph#a9bd9 relayoutBoundary=up1)

When the exception was thrown, this was the stack: 
#0      Hero._allHeroesFor.inviteHero.<anonymous closure> (package:flutter/src/widgets/heroes.dart:265:11)
#1      Hero._allHeroesFor.inviteHero (package:flutter/src/widgets/heroes.dart:275:8)
#2      Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:294:21)
#3      SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5117:14)
#4      Hero._allHeroesFor.visitor (package:flutter/src/widgets/heroes.dart:307:15)

国外有一篇国外网友的错误是记录他的错误，我的错误和他一样，正常点理解就是类似于Android里面两个空间抢占了焦点，是这个意思，我是这样理解的，但是按照flutter来说，是子树的获取点击事件被 c这个组件拦截，从而使子树的点击被 FloatingActionButton 占领，解决的办法就是不要把 FloatingActionButton 和别的点击空间放置在同一树下，比如共同当做item 放置在了 listview下，这样就会出现这样的问题；

解决方案

删除FloatingActionButton 的代码就好了。