title: Flutter - how to add done button in number keyboard in flutter
body: <p>I am trying to add <code>done</code> button in number type input for a <code>TextFormField</code> in flutter but I could not able to do that.</p>
  <pre><code>TextFormField(
            key: Key(keyValue),
            initialValue: valueBuilder,
            onSaved: (text) {
              fieldsController.text = text.trim();
            },
            inputFormatters: [inputFormatters],
            keyboardType: TextInputType.phoneNumber,)
  </code></pre>
  <p>I want create a keyboard like the below. For the input text form field.</p>
  <p><a href="https://i.stack.imgur.com/zc2k8.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zc2k8.png" alt="this" /></a></p>