Flutter: obscureText, how to stop showing typed characters

Question

When typing text into a field with obscureText: true, each typed character is displayed briefly before being converted to a bullet. How do you stop the behavior?

Answer 1

This was fixed on Web/Desktop, but there's no option to do it on Mobile. You can create a custom TextEditingController as suggested in this comment:

class ObscuringTextEditingController extends TextEditingController {
  @override
  TextSpan buildTextSpan({TextStyle style, bool withComposing}) {
    var displayValue = '•' * value.text.length;
    if (!value.composing.isValid || !withComposing) {
      return TextSpan(style: style, text: displayValue);
    }
    final TextStyle composingStyle = style.merge(
      const TextStyle(decoration: TextDecoration.underline),
    );
    return TextSpan(
      style: style,
      children: <TextSpan>[
        TextSpan(text: value.composing.textBefore(displayValue)),
        TextSpan(
          style: composingStyle,
          text: value.composing.textInside(displayValue),
        ),
        TextSpan(text: value.composing.textAfter(displayValue)),
      ],
    );
  }
}

Remove obscureText and use controller:

var passwordController = ObscuringTextEditingController();

TextField(
  controller: passwordController,
  decoration: const InputDecoration(hintText: 'Password'),
)