Flutter - RichText not appear when called - flutter

Question

I'm fairly new to Flutter,
I created this script where the Accuracy function adds green TextSpan to the AccuracySpeech list if the spoken word is present in the text string or otherwise it is red.
The script seems to work, the only problem is that I would like once it finishes listening, the Accuracy() function is called and the RichText() appears on the screen (currently the Accuracy() function is called, but the RichText does not appear).
Anyone know how I can fix and make the RichText appear?
import 'dart:core';
import 'package:flutter/material.dart';
import 'package:speech_to_text/speech_recognition_result.dart';
import 'package:speech_to_text/speech_to_text.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key}) : super(key: key);
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
SpeechToText _speechToText = SpeechToText();
bool _speechEnabled = false;
String _lastWords = '';
#override
void initState() {
super.initState();
_initSpeech();
}
/// This has to happen only once per app
void _initSpeech() async {
_speechEnabled = await _speechToText.initialize();
setState(() {});
}
/// Each time to start a speech recognition session
void _startListening() async {
AccuracySpeech.clear();
await _speechToText.listen(onResult: _onSpeechResult);
setState(() {});
}
/// Manually stop the active speech recognition session
/// Note that there are also timeouts that each platform enforces
/// and the SpeechToText plugin supports setting timeouts on the
/// listen method.
void _stopListening() async {
await _speechToText.stop();
Accuracy(_lastWords, text);
setState(() {});
}
/// This is the callback that the SpeechToText plugin calls when
/// the platform returns recognized words.
void _onSpeechResult(SpeechRecognitionResult result) {
setState(() {
_lastWords = result.recognizedWords;
});
}
String text = 'Hi, my name is Gabriele';
List<TextSpan> AccuracySpeech = [];
void Accuracy(String _lastWords, String text) {
var lastWordsSplitted = _lastWords.toLowerCase().split(' ');
var textSplitted = text.toLowerCase().split(' ');
print(lastWordsSplitted);
for (String word in lastWordsSplitted) {
if (textSplitted.contains(word)) {
AccuracySpeech.add(
TextSpan(text: word + ' ', style: TextStyle(color: Colors.green)),
);
} else {
AccuracySpeech.add(
TextSpan(text: word + ' ', style: TextStyle(color: Colors.red)),
);
}
}
print(AccuracySpeech);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Speech Demo'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Center(child: Text(text)),
Container(
padding: EdgeInsets.all(16),
child: Text(
'Recognized words:',
style: TextStyle(fontSize: 20.0),
),
),
Expanded(
child: Container(
padding: EdgeInsets.all(16),
child: Text(
// If listening is active show the recognized words
_speechToText.isListening
? '$_lastWords'
// If listening isn't active but could be tell the user
// how to start it, otherwise indicate that speech
// recognition is not yet ready or not supported on
// the target device
: _speechEnabled
? 'Tap the microphone to start listening...'
: 'Speech not available',
),
),
),
// Todo: Make RichText appear on the screen when stop listening
Expanded(
child: Center(
child: RichText(
text: TextSpan(
style: TextStyle(fontSize: 18.0),
children: AccuracySpeech,
),
),
),
),
/// Listen Button
Center(
child: Container(
child: RawMaterialButton(
onPressed: _speechToText.isNotListening
? _startListening
: _stopListening,
child: Icon(
_speechToText.isNotListening ? Icons.mic_off : Icons.mic,
size: 27,
color: Colors.white,
),
elevation: 0,
shape: CircleBorder(),
constraints: BoxConstraints.tightFor(
width: 48.0,
height: 48.0,
),
),
decoration: BoxDecoration(
color: Color(0xFF25BBC2),
borderRadius: BorderRadius.circular(40.0),
),
),
),
],
),
),
);
}
}
Hope someone can help me.
Thank you :)