Exception Caught by widgets library
Question
I am getting an exception when fetching data from API and listing it using ListView
When I am giving itemCount less than the total fetched data then its working fine and showing one less element without any infinte scrolling else its showing error with infinite scrolling, here is the code:
Expanded(
child: StreamBuilder(
initialData: 'https://www.triply.fun/tc-api/adpepv/tickets_info/20/1/',
stream: apiURL,
builder: (context, snapshotVal) {
return Container(
child: FutureBuilder<List<TicketsInfo>>(
future: ticketInfo(snapshotVal.data),
builder: (context, snapshot) {
return (snapshot.hasData &&
snapshot.data.length != null && snapshot.data.length > 0 )
? ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
padding: EdgeInsets.only(bottom: 20),
itemBuilder: (context, int index) {
return GestureDetector(
onTap: () => Navigator.pushNamed(
context, "/Detail"),
child: Column(
children: <Widget>[
Container(
height: 1,
color: Colors.black12,
),
Container(
padding:
EdgeInsets.all(0),
margin: EdgeInsets.all(0),
child: Row(
children: <Widget>[
Expanded(
child: Container(
padding: EdgeInsets
.symmetric(
horizontal:
20),
alignment: Alignment
.centerLeft,
child: Text(
"${snapshot.data[index].data.buyerFirst} ${snapshot.data[index].data.buyerFirst}",
style: textStyle(
kColor_dark_text,
FontWeight
.w400,
16),
),
height: 74,
),
),
Container(
width: 40,
child: Image.asset(
ic_forward,
fit: BoxFit
.contain,
height: 10,
width: 6,
),
),
Padding(
padding: EdgeInsets
.only(
left: 10))
],
)),
],
),
);
},
itemCount: snapshot.data.length)
: Center(
child: CircularProgressIndicator(
valueColor:
AlwaysStoppedAnimation<Color>(
kColor_green_theme)));
}));
}),
)
Here is the Run error I am getting:
I/flutter (17054): url got https://www.triply.fun/tc-api/adpepv/tickets_info/20/1/
I/flutter (17054): Data fetched [Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo', Instance of 'TicketsInfo']
I/flutter (17054): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (17054): The following NoSuchMethodError was thrown building:
I/flutter (17054): The getter 'buyerFirst' was called on null.
I/flutter (17054): Receiver: null
I/flutter (17054): Tried calling: buyerFirst
I/flutter (17054):
I/flutter (17054): When the exception was thrown, this was the stack:
I/flutter (17054): #0 Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:50:5)
I/flutter (17054): #1 _ListScreenState.build.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:check_in/src/screens/list_screen.dart:141:94)
I/flutter (17054): #2 SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:397:15)
I/flutter (17054): #3 SliverMultiBoxAdaptorElement._build.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1000:67)
I/flutter (17054): #4 _HashMap.putIfAbsent (dart:collection/runtime/libcollection_patch.dart:143:29)
I/flutter (17054): #5 SliverMultiBoxAdaptorElement._build (package:flutter/src/widgets/sliver.dart:1000:26)
I/flutter (17054): #6 SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1013:55)
I/flutter (17054): #7 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2266:19)
I/flutter (17054): #8 SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1006:11)
I/flutter (17054): #9 RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:274:23)
I/flutter (17054): #10 RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:1730:58)
I/flutter (17054): #11 PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:799:15)
I/flutter (17054): #12 RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:1730:13)
I/flutter (17054): #13 RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:263:5)
I/flutter (17054): #14 RenderSliverMultiBoxAdaptor.insertAndLayoutChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:401:5)
I/flutter (17054): #15 RenderSliverList.performLayout.advance (package:flutter/src/rendering/sliver_list.dart:190:19)
I/flutter (17054): #16 RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:233:19)
I/flutter (17054): #17 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #18 RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:182:11)
I/flutter (17054): #19 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #20 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:405:13)
I/flutter (17054): #21 RenderShrinkWrappingViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1645:12)
I/flutter (17054): #22 RenderShrinkWrappingViewport.performLayout (package:flutter/src/rendering/viewport.dart:1608:20)
I/flutter (17054): #23 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #24 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #25 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #26 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #27 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #28 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #29 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #30 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #31 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #32 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #33 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #34 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #35 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #36 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #37 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #38 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:104:13)
I/flutter (17054): #39 RenderObject.layout (package:flutter/src/rendering/object.dart:1634:7)
I/flutter (17054): #40 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:798:17)
I/flutter (17054): #41 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1509:7)
I/flutter (17054): #42 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:768:18)
I/flutter (17054): #43 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:281:19)
I/flutter (17054): #44 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:677:13)
I/flutter (17054): #45 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:219:5)
I/flutter (17054): #46 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter (17054): #47 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter (17054): #48 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:842:5)
I/flutter (17054): #49 _invoke (dart:ui/hooks.dart:154:13)
I/flutter (17054): #50 _drawFrame (dart:ui/hooks.dart:143:3)
I/flutter (17054): ════════════════════════════════════════════════════════════════════════════════════════════════════
1 answers
solution1
0 2020-02-09 10:41:31
You can remove data before buyerFirst and try it again:
${snapshot.data[index]**.data**.buyerFirst}
${snapshot.data[index].data.buyerFirst}
replace with:
${snapshot.data[index].buyerFirst} ${snapshot.data[index].buyerFirst}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
NoSuchMethodError, Exception caught by widgets library
Flutter Exception caught by widgets library
Exception caught by widgets library - Flutter
EXCEPTION CAUGHT BY WIDGETS LIBRARY in flutter app
i am getting Exception caught by widgets library
Exception caught by widgets library Incorrect use of ParentDataWidget
Flutter: Exception caught by widgets library error
Exception caught by widgets library: Incorrect use of ParentDataWidget
Exception Caught By Widgets Library error in Flutter
How to solve exception caught by widgets library?
Related Tags