flutter-firebase
ListView.builder
显示失败!
列表视图.builder
return ListView.builder(
itemCount: snapshot.data.documents.length,
padding: const EdgeInsets.only(top: 10.0),
itemExtent: 25.0,
itemBuilder: (context, index) {
DocumentSnapshot ds = snapshot.data.documents[index];
return Text(" ${ds['name']} ${ds['vote']}");
});
我的完整代码是:
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
void main() => runApp(MyApp(
textInput: Text("Text Widget"),
));
class MyApp extends StatefulWidget {
final Widget textInput;
MyApp({this.textInput});
@override
State<StatefulWidget> createState() => MyAppState();
}
class MyAppState extends State<MyApp> {
bool checkBoxValue = false;
@override
Widget build(BuildContext ctxt) {
return new MaterialApp(
home: SafeArea(
child: Scaffold(
body: new Center(
child: new Column(
children: <Widget>[
widget.textInput,
Checkbox(
value: checkBoxValue,
onChanged: (bool newValue){
setState(() {
checkBoxValue = newValue;
});
}
),
StreamBuilder(
stream: Firestore.instance.collection('baby').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) return const Text('Loading...');
// DocumentSnapshot ds = snapshot.data.documents[0];
// return new Text(" ${ds['name']} ${ds['vote']}");
// When i try to replace the above code by the below it fails!
return ListView.builder(
itemCount: snapshot.data.documents.length,
padding: const EdgeInsets.only(top: 10.0),
itemExtent: 25.0,
itemBuilder: (context, index) {
DocumentSnapshot ds = snapshot.data.documents[index];
return Text(" ${ds['name']} ${ds['vote']}");
});
// End of the ListView builder that fails!
}),
],
))),
),
);
}
}
i/flutter(9119):视区在滚动方向展开以填充其容器。在这种情况下,垂直
i/flutter(9119):当可滚动小部件嵌套在另一个可滚动小部件中时,通常会发生这种情况。
i/flutter(9119):视区高度与子视区高度之和。
i/flutter(9119):3_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):5_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):7_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):9_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):11_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):13_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):15_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):19 renderflex.performlayout(包装:flutter/src/rendering/flex.dart:738:15)
i/flutter(9119):21 renderpositionedbox.performlayout(package:flutter/src/rendering/shifted box.dart:381:13)
i/flutter(9119):23 multichildlayoutelegate.layoutchild(软件包:flutter/src/rendering/custom-layout.dart:141:11)
i/flutter(9119):25多芯片布局外推。uCallPerformLayout(软件包:flutter/src/rendering/custom layout.dart:211:7)
i/flutter(9119):27 renderbject.layout(包装:flutter/src/rendering/object.dart:1570:7)
i/flutter(9119):29 renderbject.layout(包装:flutter/src/rendering/object.dart:1570:7)
i/flutter(9119):31_rendercustomclip.performlayout(package:flutter/src/rendering/proxy ou box.dart:1143:11)
i/flutter(9119):33 renderpadding.performlayout(package:flutter/src/rendering/shifted box.dart:199:11)
i/flutter(9119):35_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):37_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):39_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):41_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):49_renderproxybox&renderbox&renderbox&renderbojectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):53 renderbject.layout(包装:flutter/src/rendering/object.dart:1570:7)
i/flutter(9119):55 renderbject.layout(包装:flutter/src/rendering/object.dart:1570:7)
i/flutter(9119):58_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):64_renderproxybox&renderbox&renderbox&renderbjectwithchildmixin&renderproxyboxmixin.perform布局(包装:flutter/src/rendering/proxy ou box.dart:109:13)
i/flutter(9119):69_widgetsflutterbinding&bindingbase&gesturebinding&servicesbinding&schedulerbinding&paintingbinding&renderbinding.drawframe(包装:flutter/src/renderbinding/binding.dart:270:19)
i/flutter(9119):71_widgetsflutterbinding&bindingbase&gesturebinding&servicesbinding&schedulerbinding&paintingbinding&renderbinding._handlepersistentframecallback(package:flutter/src/rendering/binding.dart:208:5)
i/flutter(9119):73_widgetsflutterbinding&bindingbase&gesturebinding&servicesbinding&scheduler binding.handledrawframe(套装:flutter/src/scheduler/binding.dart:930:9)
i/flutter(9119):76_timer._runtimers(dart:隔离/运行时/libtimer_impl.dart:382:19)
i/flutter(9119):78 rawreceiveportimpl.handlemessage(dart:isolate/runtime/libisolate_patch.dart:165:12)
I/颤振(9119):
I/Flutter(9119):渲染视图端口A2532需求-布局需求-油漆
i/flutter(9119):“手势语义rawgesturedetector-[labeledglobalkey 08fb7]
I/Flutter(9119):通知列表器
I/Flutter(9119):可滚动状态,AlwaysCrollableScrollPhysics->ClampingCrollPhysics,IdleScrollActivity d36b9,
I/颤振(9119):锚:0.0
I/Flutter(9119):renderPreatboundary 8C403需求-布局需求-油漆
I/颤振(9119):
i/flutter(9119):引发了另一个异常:renderbox未布局:renderignorepointer cfad6 relayoutboundary=up10 needs-paint
i/flutter(9119):引发了另一个异常:renderBox未布局:renderInterlistener 0da92 relayoutboundary=up8 needs-paint
I/Flutter(9119):引发了另一个异常:renderBox未布局:_renderExcludesCrollSemantics AD008 relayoutboundary=up6 needs-paint
在1363毫秒内重新加载394个图书馆中的1个。
