NoSuchMethodError: The method '>' was called on null. #21628
Comments
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Could you please create a complete runnable example (main.dart) that allows to reproduce? |
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I creat a example , this is all of the main.dart。 when i run , i get the same error : import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
_cancle(){
}
String _validate(String value) {
return null;
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('test'),
automaticallyImplyLeading: false,
actions: <Widget>[
new IconButton(icon: new Icon(Icons.close), onPressed: _cancle),
],
),
body: new Container(
color: Colors.blue,
padding: const EdgeInsets.all(12.0),
child: new Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
new TextFormField(
keyboardType: TextInputType.text,
validator: _validate,
textCapitalization: TextCapitalization.words,
obscureText: false,
decoration: new InputDecoration(
fillColor: Colors.white,
border: InputBorder.none,
filled: true,
hintText: 'test',
labelText: 'test',
hintStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
labelStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
),
),
const SizedBox(height: 10.0),
new TextFormField( // new Text('test'), // this place !!!! if the widget is Text . it can word
keyboardType: TextInputType.text,
validator: _validate,
textCapitalization: TextCapitalization.words,
obscureText: false,
decoration: new InputDecoration(
fillColor: Colors.white,
border: InputBorder.none,
filled: true,
hintText: 'test',
labelText: 'test',
hintStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
labelStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
),
),
new Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
new TextFormField( // new Text('test'), // this place !!!! if the widget is Text . it can word
keyboardType: TextInputType.text,
validator: _validate,
textCapitalization: TextCapitalization.words,
obscureText: false,
decoration: new InputDecoration(
fillColor: Colors.white,
border: InputBorder.none,
filled: true,
hintText: 'test',
labelText: 'test',
hintStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
labelStyle:
TextStyle(color: Color(0x73000000), fontSize: 14.0),
),
),
],
),
],
),
));
}
}
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Thanks a lot for the reproduction code. With this code I get with Looks like yours, but is missing. |
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Adding a new Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Flexible(
child: new TextFormField(Tentatively closing. Add a comment to reopen if you disagree. |
zoechi
added
framework
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I/flutter ( 4598): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ 🔥 To hot reload changes while running, press "r". To hot restart (and rebuild state), press "R". Initializing hot reload... Reloaded 0 of 455 libraries in 3,687ms. I/flutter ( 4598): Another exception was thrown: RenderBox was not laid out: RenderRepaintBoundary#b9ed0 relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE how do i solve this I m also new one in flutter gang plzzzzzzzzzz help |
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I got a very similar error recently. In my case, I was running a forloop inside the children property of a Column widget. What I did wrong? for(int i; i<data.length; i++) so I is really null and I am running "<" against null. |
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This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of |
Steps to Reproduce
this is my code :
Logs
when i run . I got this error:
but if i used Text widget , it can worked.
flutter doctor -v
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