Keyboard automatically closes in flutter while using form - flutter

Question

In my code my keyboard closes automatically when using text formfield and I realized that it closes when I use Form and its key for validation, I am using list view with form but when I remove form it works fine but I need a form to validate, what should I do ?
Form(
key: _formKeyPlant,
child: ListView(children: [
SizedBox(
width: size.width,
child: Column(
children: [
CustomTextField(
controller: name,
title: 'Name',
validator: (text) {
if (text == null || text.isEmpty) {
return 'Required';
} else if (text.contains(RegExp(r'[0-9]')) ||
text.contains(RegExp(r'[#?!#$%^&*-]'))) {
return 'Invalid Input';
}
return null;
},
),
15.verticalSpace,
CustomTextField(
controller: location,
title: 'Location',
validator: (text) {
if (text == null || text.isEmpty) {
return 'Required';
} else if (text.contains(RegExp(r'[0-9]')) ||
text.contains(RegExp(r'[#?!#$%^&*-]'))) {
return 'Invalid Input';
}
return null;
},
),
15.verticalSpace,
CustomTextField(
enabled: false,
onTap: () async {
final response = await showAppBottomSheet(
context,
const TreesInfoBottomSheet(),
);
if (response != null) {
treeType.text = response['name'];
treeTypeId = response['id'];
}
},
controller: treeType,
title: 'Tree Type',
),
15.verticalSpace,
CustomTextField(
controller: ageOfTree,
inputType: TextInputType.number,
validator: (text) {
if (text == null || text.isEmpty) {
return 'Required';
} else if (text.contains(RegExp(r'[a-z]')) ||
text.contains(RegExp(r'[A-Z]')) ||
text.contains(RegExp(r'[#?!#$%^&*-]'))) {
return 'Invalid Input';
}
return null;
},
title: 'Age of Tree',
),
15.verticalSpace,
CustomTextField(
controller: registration,
title: 'Registration ID (Optional)',
),
15.verticalSpace,
CustomTextField(
maxLines: 6,
controller: comments,
labelText: 'comments',
),
},
),
40.verticalSpace,
],
).px(18),
),
]),
),

Answer 1

Correct formate of using textform filed with form and scroll widget is
Please try the below code your keyboard with never hide on textformfiled
final Key _key = GlobalKey();
FocusNode f1 = FocusNode();
FocusNode f2 = FocusNode();
#override
Widget build(BuildContext context) {
return Form(
key: _key,
child: SingleChildScrollView(
child: Column(
children: [
TextFormField(
focusNode: f1,
onFieldSubmitted: (c) {
f1.unfocus();
f2.requestFocus();
},
),
TextFormField(
focusNode: f2,
),
],
),
),
);
}