Flutter: Column Row [Beginner] - flutter

Question

I am new into Flutter and at the moement I try to code my first App.
I just want to implement a screen with Text Fields - that worked.
Now I want to arrange the first two text field next to each other. I tried to use Row () and I got no errors, but suddenly the emulator shows me just a blank page.
Could someone tell me what I have to change? I don't know what I did wrong, because I do not get any errors.
Thanks for help!
import 'package:flutter/material.dart';
class TestEdit extends StatefulWidget {
#override
_TestEditState createState() => _TestEditState();
}
class _TestEditState extends State<TestEdit> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
automaticallyImplyLeading: true,
//`true` if you want Flutter to automatically add Back Button when needed,
//or `false` if you want to force your own back button every where
backgroundColor: Colors.white,
leading: IconButton(
icon: Icon(Icons.arrow_back, color: Colors.black),
onPressed: () => Navigator.pop(context, false),
),
),
body: Column(
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.start,
//mainAxisSize: MainAxisSize.min,
//padding: EdgeInsets.symmetric(horizontal: 10, vertical: 10),
children: <Widget>[
//Row(children:[
//crossAxisAlignment: CrossAxisAlignment.start,
//mainAxisSize: MainAxisSize.min,
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'InputFirst',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'InputSecond',
),
),
),
],
),
//],
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
],
),
);
}
}

Answer 1

TextField widget will try to horizontally expand as much as possible.
So if you want to put an TextField in a Row, you should wrap it with Flexible(or Expanded) widget.
Try this,
class TestEdit extends StatefulWidget {
#override
_TestEditState createState() => _TestEditState();
}
class _TestEditState extends State<TestEdit> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
automaticallyImplyLeading: true,
//`true` if you want Flutter to automatically add Back Button when needed,
//or `false` if you want to force your own back button every where
backgroundColor: Colors.white,
leading: IconButton(
icon: Icon(Icons.arrow_back, color: Colors.black),
onPressed: () => Navigator.pop(context, false),
),
),
body: Column(
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.start,
//mainAxisSize: MainAxisSize.min,
//padding: EdgeInsets.symmetric(horizontal: 10, vertical: 10),
children: <Widget>[
//Row(children:[
//crossAxisAlignment: CrossAxisAlignment.start,
//mainAxisSize: MainAxisSize.min,
Expanded( //TODO: Wrap with `Expanded`
child: Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'InputFirst',
),
),
),
),
Expanded( //TODO: Wrap with Expanded
child: Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'InputSecond',
),
),
),
),
],
),
//],
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
Padding(
padding: EdgeInsetsDirectional.fromSTEB(10, 10, 10, 0),
child: TextField(
obscureText: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Input',
),
),
),
],
),
);
}
}

Answer 2

When ever you need add widgets vertically you need to add column and in horizontal way you need to add row. Both widgets contain children.
import 'package:flutter/material.dart';
class Beginner extends StatefulWidget {
#override
_BeginnerState createState() => _BeginnerState();
}
class _BeginnerState extends State<Beginner> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
Row(
children: [
Text('A'),
Text('B'),
Text('C'),
],
),
Row(
children: [
Text('A'),
Text('B'),
Text('C'),
],
),
Row(
children: [
Text('A'),
Text('B'),
Text('C'),
],
),
Row(
children: [
Text('A'),
Text('B'),
Text('C'),
],
),
],
),
);
}
}