How to disable TextFormField default animation - flutter

Question

I want to disable the default behavior when a user focus on the text field, where the label text gets smaller and docks to the upper left :
I want to disable this behavior and only make the label text disappear, how can I do it?

Answer 1

Use FloatingLabelBehavior.never inside InputDecoration will help you hiding your label and instead of labelText you can use hintText so it becomes disappear when you type something.
TextFormField(
decoration: InputDecoration(
hintText: "Search",
floatingLabelBehavior: FloatingLabelBehavior.never,
border: InputBorder.none,
suffixIcon: Icon(
Icons.search,
),
),
),

Answer 2

Try out this
TextFormField(
cursorColor: Colors.black,
keyboardType: TextInputType.text,
decoration: new InputDecoration(
border: InputBorder.none,
focusedBorder: InputBorder.none,
enabledBorder: InputBorder.none,
errorBorder: InputBorder.none,
disabledBorder: InputBorder.none,
contentPadding:
EdgeInsets.only(left: 15, bottom: 11, top: 11, right: 15),
hintText: "Hints"),
)
And customize textfield decoration as you desired.

Answer 3

You can actually add a leading widget inside TextFormField where you can put the country picker.
Row(
children: <Widget>[
Expanded(
child: FormBuilderTextField(
validator: FormBuilderValidators.compose([
FormBuilderValidators.required(context),
FormBuilderValidators.minLength(context, 9),
FormBuilderValidators.maxLength(context, 9),
FormBuilderValidators.numeric(context),
]),
name: "mobile_number",
keyboardType: TextInputType.phone,
decoration: InputDecoration(
prefixIcon: Padding(
padding: const EdgeInsets.symmetric(horizontal: 15),
child: CountryPickerDropdown(
initialValue: 'AU',
itemBuilder: _buildDropdownItem,
itemFilter: (c) => [
'AU',
'PH',
].contains(c.isoCode),
priorityList: [
CountryPickerUtils.getCountryByIsoCode('AU'),
CountryPickerUtils.getCountryByIsoCode('PH'),
],
sortComparator: (Country a, Country b) =>
a.isoCode.compareTo(b.isoCode),
onValuePicked: (Country country) {
print("${country}");
},
),
),
labelText: 'Mobile #',
floatingLabelBehavior: FloatingLabelBehavior.never,
),
)),
],
),