Question

我创建了一个名为ListerCommande（）的自定义小部件，但我尝试在homeActivity中调用它，但它给了我错误，我尝试使用Expanded并添加mainAxisSize，但仍然存在相同的错误，有人可以帮忙我，这就是我叫小部件的地方：

body: new Container(
          child:
          SingleChildScrollView(
          child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
          ListerCommande()
                            ],
                        )
                       ),
               )

ListerCommande小部件：

class ListerCommande extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,
      appBar: new AppBar(
        title: new Text("Les Commandes"),
        backgroundColor: Colors.pink,
      ),
      body: SingleChildScrollView(
        child: Column(
        children: <Widget>[
          _buildCommandeList(context)
        ],
      ),
      ),
    );
  }
  StreamBuilder<List<CommandeWithClientWithClientTypeWithCarteSimWithDemandeCarte>> _buildCommandeList(BuildContext context) {
    final dao = Provider.of<CommandeDao>(context);
    return StreamBuilder(
      stream: dao.watchAllCommandes(),
      builder: (context, AsyncSnapshot<List<CommandeWithClientWithClientTypeWithCarteSimWithDemandeCarte>> snapshot) {
        final commandes = snapshot.data ?? List();
        return ListView.builder(
          scrollDirection: Axis.vertical,
          shrinkWrap: true,
          itemCount: commandes.length,
          itemBuilder: (_, index) {
            final itemCommande = commandes[index];
            return _buildListItem(itemCommande, dao,context);
          },
        );
      },
    );
  }
  Widget _buildListItem(CommandeWithClientWithClientTypeWithCarteSimWithDemandeCarte itemCommande, CommandeDao dao,BuildContext context) {
    return Slidable(
      actionPane: SlidableDrawerActionPane(),
      secondaryActions: <Widget>[
        new IconSlideAction(
            caption: 'Delete',
            color: Colors.red,
            icon: Icons.delete,
            onTap: () {
              dao.deleteCommande(itemCommande.commande);
              dao.deleteClient(itemCommande.client);
              dao.deleteTypeClient(itemCommande.typeClient);

            }
        )

      ],
      child: ListTile(
        title: Text("Commande Numero : " + itemCommande.commande.idCommande.toString()),

        onTap: (){
          Navigator.push(context, MaterialPageRoute(builder: (context) => MainPage(itemCommande)),
          );
        },
      ),
    );
  }
}

这是给我的错误

I/flutter (32394): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (32394): The following assertion was thrown during performLayout():
I/flutter (32394): FlutterError contained multiple error summaries.
I/flutter (32394): All FlutterError objects should have only a single short (one line) summary description of the
I/flutter (32394): problem that was detected.
I/flutter (32394): Malformed FlutterError:
I/flutter (32394):   RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (32394):   This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (32394):   inside another render object that allows its children to pick their own size.
I/flutter (32394):   RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (32394):   This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (32394):   inside another render object that allows its children to pick their own size.
I/flutter (32394):   The nearest ancestor providing an unbounded height constraint is: _RenderSingleChildViewport#e3a3d relayoutBoundary=up10 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
I/flutter (32394):     needs compositing
I/flutter (32394):     creator: _SingleChildViewport ← IgnorePointer-[GlobalKey#c2421] ← Semantics ← Listener ←
I/flutter (32394):       _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#a3e7d] ←
I/flutter (32394):       Listener ← _ScrollableScope ← _ScrollSemantics-[GlobalKey#ef06e] ← RepaintBoundary ← CustomPaint ←
I/flutter (32394):       RepaintBoundary ← ⋯
I/flutter (32394):     parentData: <none> (can use size)
I/flutter (32394):     constraints: BoxConstraints(0.0<=w<=360.0, 0.0<=h<=560.0)
I/flutter (32394):     size: MISSING
I/flutter (32394):   The constraints that applied to the RenderCustomMultiChildLayoutBox were:
I/flutter (32394):     BoxConstraints(0.0<=w<=360.0, 0.0<=h<=Infinity)
I/flutter (32394):   The exact size it was given was:
I/flutter (32394):     Size(360.0, Infinity)
I/flutter (32394):   See https://flutter.dev/docs/development/ui/layout/box-constraints for more information.
I/flutter (32394): 
I/flutter (32394): The malformed error has 2 summaries.
I/flutter (32394): Summary 1: RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (32394): Summary 2: RenderCustomMultiChildLayoutBox object was given an infinite size during layout.
I/flutter (32394): 
I/flutter (32394): This error should still help you solve your problem, however please also report this malformed error
I/flutter (32394): in the framework by filing a bug on GitHub:
I/flutter (32394):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (32394): 
I/flutter (32394): When the exception was thrown, this was the stack:
I/flutter (32394): #0      new FlutterError.fromParts.<anonymous closure> (package:flutter/src/foundation/assertions.dart:540:9)
I/flutter (32394): #1      new FlutterError.fromParts (package:flutter/src/foundation/assertions.dart:543:6)
I/flutter (32394): #2      RenderBox.debugAssertDoesMeetConstraints.<anonymous closure> (package:flutter/src/rendering/box.dart:1966:28)
I/flutter (32394): #3      RenderBox.debugAssertDoesMeetConstraints (package:flutter/src/rendering/box.dart:2029:6)
I/flutter (32394): #4      RenderBox.size=.<anonymous closure> (package:flutter/src/rendering/box.dart:1740:7)
I/flutter (32394): #5      RenderBox.size= (package:flutter/src/rendering/box.dart:1742:6)
I/flutter (32394): #6      RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:5)
I/flutter (32394): #7      RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #8      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #9      RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #10     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #11     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1214:11)
I/flutter (32394): #12     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #13     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:743:15)
I/flutter (32394): #14     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #15     _RenderSingleChildViewport.performLayout (package:flutter/src/widgets/single_child_scroll_view.dart:497:13)
I/flutter (32394): #16     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #17     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #18     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #19     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #20     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #21     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #22     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #23     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #24     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #25     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #26     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #27     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #28     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #29     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #30     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #31     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #32     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #33     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #34     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #35     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
I/flutter (32394): #36     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:443:7)
I/flutter (32394): #37     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
I/flutter (32394): #38     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
I/flutter (32394): #39     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #40     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #41     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #42     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #43     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1214:11)
I/flutter (32394): #44     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #45     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #46     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #47     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #48     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #49     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #50     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #51     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #52     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #53     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #54     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #55     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #56     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #57     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #58     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #59     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #60     RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3076:13)
I/flutter (32394): #61     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #62     RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter (32394): #63     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #64     __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #65     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #66     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #67     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #68     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #69     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #70     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #71     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #72     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #73     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #74     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #75     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #76     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #77     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #78     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #79     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #80     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #81     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #82     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #83     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #84     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #85     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #86     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #87     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #88     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #89     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #90     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #91     RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3076:13)
I/flutter (32394): #92     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): moor: SELECT commandes.id_commande AS "commandes.id_commande", commandes.clientid AS "commandes.clientid", commandes.date AS "commandes.date", clients.id_client AS "clients.id_client", clients.type_clientid AS "clients.type_clientid", clients.nom AS "clients.nom", clients.prenom AS "clients.prenom", clients.ddn AS "clients.ddn", clients.ville AS "clients.ville", clients.ncd AS "clients.ncd", clients.image_devant AS "clients.image_devant", clients.image_arriere AS "clients.image_arriere", type_clients.id_type_client AS "type_clients.id_type_client", type_clients.prix_e AS "type_clients.prix_e", type_clients.prix_p AS "type_clients.prix_p", type_clients.libelle AS "type_clients.libelle", demande_cartes.numero_demande AS "demande_cartes.numero_demande", demande_cartes.id_commande AS "demande_cartes.id_commande", demande_cartes.carte_sim_id AS "demande_cartes.carte_sim_id", carte_sims.id_carte_sim AS "carte_sims.id_carte_sim", carte_sims.code_bare1 AS "carte_sims.code_bare1", carte_sims.code_bare2 AS "carte_sims
I/flutter (32394): #93     RenderStack.performLayout (package:flutter/src/rendering/stack.dart:510:15)
I/flutter (32394): #94     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #95     __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #96     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #97     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #98     RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #99     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #100    RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #101    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #102    RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #103    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #104    RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #105    _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
I/flutter (32394): #106    RenderObject.layout (package:flutter/src/rendering/object.dart:1619:7)
I/flutter (32394): #107    RenderView.performLayout (package:flutter/src/rendering/view.dart:151:13)
I/flutter (32394): #108    RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1496:7)
I/flutter (32394): #109    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:765:18)
I/flutter (32394): #110    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:346:19)
I/flutter (32394): #111    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:701:13)
I/flutter (32394): #112    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
I/flutter (32394): #113    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
I/flutter (32394): #114    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
I/flutter (32394): #115    _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:784:7)
I/flutter (32394): #124    _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
I/flutter (32394): #125    _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
I/flutter (32394): #126    _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
I/flutter (32394): (elided 8 frames from package dart:async and package dart:async-patch)
I/flutter (32394): 
I/flutter (32394): The following RenderObject was being processed when the exception was fired: RenderCustomMultiChildLayoutBox#37a5d relayoutBoundary=up14 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
I/flutter (32394):   creator: CustomMultiChildLayout ← AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ←
I/flutter (32394):     _InkFeatures-[GlobalKey#17d48 ink renderer] ← NotificationListener<LayoutChangedNotification> ←
I/flutter (32394):     PhysicalModel ← AnimatedPhysicalModel ← Material ← PrimaryScrollController ← _ScaffoldScope ←
I/flutter (32394):     Scaffold ← ⋯
I/flutter (32394):   parentData: <none> (can use size)
I/flutter (32394):   constraints: BoxConstraints(0.0<=w<=360.0, 0.0<=h<=Infinity)
I/flutter (32394):   size: Size(360.0, Infinity)
I/flutter (32394): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (32394):     child 1: RenderRepaintBoundary#26867 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):       child: RenderCustomPaint#17704 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):         child: RenderRepaintBoundary#b892c NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):           child: _RenderScrollSemantics#97627 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):             child: RenderPointerListener#9c994 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):     child 2: RenderConstrainedBox#de378 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):       child: RenderSemanticsAnnotations#a5284 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):         child: RenderAnnotatedRegion<SystemUiOverlayStyle>#93e71 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):           child: RenderPhysicalModel#5f624 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):             child: _RenderInkFeatures#eda43 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):     child 3: RenderStack#b4a86 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):       child 1: RenderTransform#808c4 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (32394):         child: RenderTransform#52fae NEEDS-LAYOUT NEEDS-PAINT
I/flutter (32394): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (32394): Another exception was thrown: FlutterError contained multiple error summaries.
I/flutter (32394): Another exception was thrown: FlutterError contained multiple error summaries.
I/flutter (32394): Another exception was thrown: FlutterError contained multiple error summaries.
I/flutter (32394): Another exception was thrown: NoSuchMethodError: The method '>' was called on null.

Answer 1

ListerCommande（）是一个列表视图，该列表视图的跳出溢出并导致该错误。将其放在扩展中。

body: Container(
          child: SingleChildScrollView(
             child: Column(
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[
                   Expanded(child: ListerCommande()),
                ],
             )
          ),
      )

Answer 2

 Column(
    children: <Widget>[
       Expanded(
          child: Card(
              elevation: 5,
              margin: EdgeInsets.all(5),
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: HorizontalBarLabelChart.withSampleData(),
              )),
        ),

      Expanded(
          child: Card(
              elevation: 5,
              margin: EdgeInsets.all(5),
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: DateTimeComboLinePointChart.withSampleData(),
                ),
              )),
        ),

    ],
  ),

示例不是您的示例，但是您可以使用此方法，这是此操作的结果

调用自定义窗口小部件时出错

2 个答案: