Flutter Input

TextField

TextField(
    keyboardType: TextInputType.numer | email,
    style: Theme.of(context).textTheme.display1,
    decoration: InputDecoration(
        labelText: "input",
        errorText: _showValidationError ? "Invalid Number" : null
    )
)

3 Ways to retrieve the text

onChanged - as soon as user types anything
onSubmitted - when user presses the enter or submit button
controller - Implements a listener