flutter: How to detect keyboard? - flutter

Question

I want detect Keyboard. And want to show it other text when keyboard is visible or unvisible.
But my code is not working.
This is my code.
class Search extends StatefulWidget {
#override
_SearchState createState() => _SearchState();
}
class _SearchState extends State<Search> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
color: Colors.white,
child: Column(
children: [
Expanded(
flex: 1,
child: ListView(
children: [
MediaQuery.of(context).viewInsets.bottom !=0 ? Center(child: Text("true"),) : Center(child: Text("false"),)
],
),
)
],
),
),
);
}
}

Answer 1

As #Anas Mohammed mentioned, you can do it with the keyboard_visibility package. Here is a total example:
import 'package:flutter/material.dart';
import 'package:keyboard_visibility/keyboard_visibility.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Keyboard visibility example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: KeyboardVisibilityExample(),
);
}
}
class KeyboardVisibilityExample extends StatefulWidget {
KeyboardVisibilityExample({Key key}) : super(key: key);
#override
_KeyboardVisibilityExampleState createState() => _KeyboardVisibilityExampleState();
}
class _KeyboardVisibilityExampleState extends State<KeyboardVisibilityExample> {
KeyboardVisibilityNotification _keyboardVisibility = new KeyboardVisibilityNotification();
int _keyboardVisibilitySubscriberId;
bool _keyboardState;
#protected
void initState() {
super.initState();
_keyboardState = _keyboardVisibility.isKeyboardVisible;
_keyboardVisibilitySubscriberId = _keyboardVisibility.addNewListener(
onChange: (bool visible) {
setState(() {
_keyboardState = visible;
});
},
);
}
#override
void dispose() {
_keyboardVisibility.removeListener(_keyboardVisibilitySubscriberId);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Keyboard visibility example'),
),
body: Center(
child: Padding(
padding: EdgeInsets.all(24.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextField(
keyboardType: TextInputType.text,
decoration: InputDecoration(
labelText: 'Input box for keyboard test',
),
),
Container(height: 60.0),
Text(
'The current state of the keyboard is: ' + (_keyboardState ? 'VISIBLE' : 'NOT VISIBLE'),
),
],
)
),
),
);
}
}

Answer 2

for to visible keyboard this code:
FocusScope.of(context).requestFocus();
for to unvisible keyboard this code:
FocusScope.of(context).unfocus();
for check visiblity of keyboard :
FocusScope.of(context).hasFocus
your provided code:
class Search extends StatefulWidget {
#override
_SearchState createState() => _SearchState();
}
class _SearchState extends State<Search> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
color: Colors.white,
child: Column(
children: [
Expanded(
flex: 1,
child: ListView(
children: [
FocusScope.of(context).hasFocus ? Center(child: Text("true"),) : Center(child: Text("false"),)
],
),
)
],
),
),
);
}
}

Answer 3

Accepted answer contains old library not support null safety, you can use this one flutter_keyboard_visibility which support null safety.