in flutter page textfield hidden by keyboard - keyboard

Question

I'm using flutter to make a page that someone can comment.And the page is shown by showModalBottomSheet. but the textfield is hidden by the keyboard when the keyboard showing in the front.
flutter doctor output:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14 18A391, locale zh-Hans-CN)
[!] Android toolchain - develop for Android devices (Android SDK 28.0.3)
✗ Android license status unknown.
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[✓] Android Studio (version 3.1)
[!] VS Code (version 1.30.0)
[✓] Connected device (1 available)
Code snippet:
showModalBottomSheet(
context: context,
builder: (BuildContext sheetContext) {
return new Container(
height: 230.0,
padding: const EdgeInsets.all(20.0),
child: ListView(
children: <Widget>[
new Column(
children: <Widget>[
new Row(
children: <Widget>[
new Text(isMainFloor ? "reply author" :"reply"),
new Expanded(
child: new Text(
title,
style: new TextStyle(color: const Color(0xFF63CA6C)),
)),
new InkWell(
child: new Container(
padding:
const EdgeInsets.fromLTRB(10.0, 6.0, 10.0, 6.0),
decoration: new BoxDecoration(
border: new Border.all(
color: const Color(0xFF63CA6C),
width: 1.0,
),
borderRadius: new BorderRadius.all(
new Radius.circular(6.0))),
child: new Text( "send",
style:
new TextStyle(color: const Color(0xFF63CA6C)),
),
),
onTap: () {
sendReply(authorId);
},
)
],
),
new Container(
height: 10.0,
),
new TextFormField(
maxLines: 5,
controller: _inputController,
focusNode: _focusNode,
decoration: new InputDecoration(
hintText: "balabala……",
hintStyle:
new TextStyle(color: const Color(0xFF808080)),
border: new OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(10.0)),
)),
),
new Padding(
padding: EdgeInsets.only(
bottom: MediaQuery.of(context).viewInsets.bottom)),
],
)
],
),
);
});
}

Answer 1

I had issues running the minimal repro provided. However, if you're using a constant height for the widget and the widget exceeds the SoftKeyboard displayed on the device, it's likely that the widget overflowed. I suggest using widgets that can adapt to the view size (i.e. Expanded) if you'd like to keep the constant height on the TextField.
Here's a sample code that you can try. I've used Expanded for displaying the details on screen while keeping the constant height on the TextField Container.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var _inputController = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(
child: Container(
color: Colors.lightBlueAccent,
child: ListView.builder(
itemCount: 15,
itemBuilder: (context, index) {
return ListTile(title: Text("List Item $index"));
},
),
),
),
Container(
height: 120,
color: Colors.tealAccent,
child: TextFormField(
maxLines: 5,
controller: _inputController,
decoration: new InputDecoration(
hintText: "Text input",
hintStyle: new TextStyle(color: Colors.black),
border: new OutlineInputBorder(
borderRadius:
const BorderRadius.all(const Radius.circular(10.0)),
),
),
),
),
],
),
),
);
}
}
Here's how it looks running