Flutter音频录制插件record_mp3的使用

简介

Record Mp3 是一个用于Flutter应用程序中进行MP3格式音频录制的插件。它利用平台原生API实现录音功能，支持iOS和Android平台。

依赖配置

根据您的Flutter版本，在pubspec.yaml文件中添加如下依赖：

• 对于 Flutter <= 1.19.x:

dependencies:
  record_mp3: ^1.0.1

• 对于 Flutter >=1.12.x <2.0.0:

dependencies:
  record_mp3: ^2.1.0

• 对于 Flutter >=2.0.0 (Null Safety):

dependencies:
  record_mp3: ^3.0.0

或者从GitHub直接引用最新版：

dependencies:
  record_mp3: 
  	git:
	 url: git://github.com/fluttercandies/flutter_record_mp3

使用方法

iOS 特别注意

确保在Info.plist文件中添加麦克风权限描述：

<key>NSMicrophoneUsageDescription</key>
<string>需要您的同意来访问麦克风</string>

示例代码

下面是一个完整的示例demo，展示了如何使用record_mp3插件创建一个简单的录音应用，包括开始、暂停、继续和停止录音的功能，并且可以播放录制完成的音频文件。

main.dart

import 'dart:io';
import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:path_provider/path_provider.dart';
import 'package:record_mp3/record_mp3.dart';
import 'package:permission_handler/permission_handler.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String statusText = "";
  bool isComplete = false;
  String recordFilePath;

  Future<bool> checkPermission() async {
    if (!await Permission.microphone.isGranted) {
      PermissionStatus status = await Permission.microphone.request();
      if (status != PermissionStatus.granted) {
        return false;
      }
    }
    return true;
  }

  void startRecord() async {
    bool hasPermission = await checkPermission();
    if (hasPermission) {
      statusText = "Recording...";
      recordFilePath = await getFilePath();
      isComplete = false;
      RecordMp3.instance.start(recordFilePath, (type) {
        statusText = "Record error--->$type";
        setState(() {});
      });
    } else {
      statusText = "No microphone permission";
    }
    setState(() {});
  }

  void pauseRecord() {
    if (RecordMp3.instance.status == RecordStatus.PAUSE) {
      bool s = RecordMp3.instance.resume();
      if (s) {
        statusText = "Recording...";
        setState(() {});
      }
    } else {
      bool s = RecordMp3.instance.pause();
      if (s) {
        statusText = "Recording pause...";
        setState(() {});
      }
    }
  }

  void stopRecord() {
    bool s = RecordMp3.instance.stop();
    if (s) {
      statusText = "Record complete";
      isComplete = true;
      setState(() {});
    }
  }

  void play() {
    if (recordFilePath != null && File(recordFilePath).existsSync()) {
      AudioPlayer audioPlayer = AudioPlayer();
      audioPlayer.play(recordFilePath, isLocal: true);
    }
  }

  int i = 0;

  Future<String> getFilePath() async {
    Directory storageDirectory = await getApplicationDocumentsDirectory();
    String sdPath = "${storageDirectory.path}/record";
    var d = Directory(sdPath);
    if (!d.existsSync()) {
      d.createSync(recursive: true);
    }
    return "$sdPath/test_${i++}.mp3";
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: <Widget>[
              Expanded(
                child: GestureDetector(
                  child: Container(
                    height: 48.0,
                    decoration: BoxDecoration(color: Colors.red.shade300),
                    child: Center(
                      child: Text(
                        'start',
                        style: TextStyle(color: Colors.white),
                      ),
                    ),
                  ),
                  onTap: () async {
                    startRecord();
                  },
                ),
              ),
              Expanded(
                child: GestureDetector(
                  child: Container(
                    height: 48.0,
                    decoration: BoxDecoration(color: Colors.blue.shade300),
                    child: Center(
                      child: Text(
                        RecordMp3.instance.status == RecordStatus.PAUSE
                            ? 'resume'
                            : 'pause',
                        style: TextStyle(color: Colors.white),
                      ),
                    ),
                  ),
                  onTap: () {
                    pauseRecord();
                  },
                ),
              ),
              Expanded(
                child: GestureDetector(
                  child: Container(
                    height: 48.0,
                    decoration: BoxDecoration(color: Colors.green.shade300),
                    child: Center(
                      child: Text(
                        'stop',
                        style: TextStyle(color: Colors.white),
                      ),
                    ),
                  ),
                  onTap: () {
                    stopRecord();
                  },
                ),
              ),
            ],
          ),
          Padding(
            padding: const EdgeInsets.only(top: 20.0),
            child: Text(
              statusText,
              style: TextStyle(color: Colors.red, fontSize: 20),
            ),
          ),
          GestureDetector(
            behavior: HitTestBehavior.opaque,
            onTap: () {
              play();
            },
            child: Container(
              margin: EdgeInsets.only(top: 30),
              alignment: AlignmentDirectional.center,
              width: 100,
              height: 50,
              child: isComplete && recordFilePath != null
                  ? Text(
                      "play",
                      style: TextStyle(color: Colors.red, fontSize: 20),
                    )
                  : Container(),
            ),
          ),
        ]),
      ),
    );
  }
}

此示例提供了一个基础框架，您可以根据实际需求对其进行扩展或修改。希望这能帮助您快速上手使用record_mp3插件！如果有任何问题，欢迎随时提问。