How To Get Each Character Entered In Text Field In Flutter App

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController _textFieldController = TextEditingController();
  String _charEntered = '';

  _onChanged(String value) {
    setState(() {
      _charEntered = value.split("").last;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.deepPurple,
        title: Text('Get Each Char Entered In TextField'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text("Char Entered: " + _charEntered,
                style: TextStyle(fontSize: 18.0)),
            SizedBox(height: 20.0),
            Padding(
              //Add padding around textfield
              padding: EdgeInsets.symmetric(horizontal: 25.0),
              child: TextField(
                controller: _textFieldController,
                onChanged: _onChanged,
              ),
            ),
          ],
        ),
      ),
    );
  }
}