pitch_detector_dart_update_test 是一个用于在 Flutter 中进行音频音高检测的插件。这个插件基于 Dart 语言，并且是 pitch_detector_dart 的一个更新版本。它可以帮助你在 Flutter 应用中实时检测音频的音高。

安装插件

首先，你需要在 pubspec.yaml 文件中添加 pitch_detector_dart_update_test 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  pitch_detector_dart_update_test: ^1.0.0  # 请确保使用最新版本

然后，运行 flutter pub get 来安装插件。

使用插件

1. 初始化插件

首先，你需要初始化 PitchDetector 对象。通常，你需要在 initState 方法中进行初始化。

import 'package:pitch_detector_dart_update_test/pitch_detector_dart_update_test.dart';

class MyHomePage extends StatefulWidget {
  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  PitchDetector? _pitchDetector;

  [@override](/user/override)
  void initState() {
    super.initState();
    _pitchDetector = PitchDetector();
  }

  [@override](/user/override)
  void dispose() {
    _pitchDetector?.dispose();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Pitch Detector Example'),
      ),
      body: Center(
        child: Text('Pitch Detector'),
      ),
    );
  }
}

2. 开始音高检测

你可以使用 _pitchDetector.start() 方法来开始音高检测。通常，你会在某个按钮的点击事件中调用这个方法。

void _startPitchDetection() async {
  if (_pitchDetector != null) {
    await _pitchDetector!.start();
  }
}

3. 监听音高数据

你可以通过设置一个回调来监听实时的音高数据。通常会使用 onPitchDetected 回调来获取音高数据。

void _startPitchDetection() async {
  if (_pitchDetector != null) {
    _pitchDetector!.onPitchDetected = (PitchDetectionResult result) {
      print('Pitch: ${result.pitch} Hz');
      print('Confidence: ${result.confidence}');
    };
    await _pitchDetector!.start();
  }
}

4. 停止音高检测

你可以使用 _pitchDetector.stop() 方法来停止音高检测。

void _stopPitchDetection() async {
  if (_pitchDetector != null) {
    await _pitchDetector!.stop();
  }
}

完整示例

以下是一个完整的示例，展示了如何在 Flutter 应用中使用 pitch_detector_dart_update_test 插件来检测音高。

import 'package:flutter/material.dart';
import 'package:pitch_detector_dart_update_test/pitch_detector_dart_update_test.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Pitch Detector Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  PitchDetector? _pitchDetector;
  String _pitchText = 'No pitch detected';

  [@override](/user/override)
  void initState() {
    super.initState();
    _pitchDetector = PitchDetector();
  }

  [@override](/user/override)
  void dispose() {
    _pitchDetector?.dispose();
    super.dispose();
  }

  void _startPitchDetection() async {
    if (_pitchDetector != null) {
      _pitchDetector!.onPitchDetected = (PitchDetectionResult result) {
        setState(() {
          _pitchText = 'Pitch: ${result.pitch} Hz';
        });
      };
      await _pitchDetector!.start();
    }
  }

  void _stopPitchDetection() async {
    if (_pitchDetector != null) {
      await _pitchDetector!.stop();
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Pitch Detector Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(_pitchText),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _startPitchDetection,
              child: Text('Start Pitch Detection'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _stopPitchDetection,
              child: Text('Stop Pitch Detection'),
            ),
          ],
        ),
      ),
    );
  }
}