android - 在 Flutter 中播放自定义声音

Question

我正在尝试播放一个自定义的 mp3 声音，我已经将它放在应用程序文件夹中的 Assets 文件夹中，就像您对字体或图像文件所做的那样，但我真的不知道如何继续。我想我可能需要将音频文件注册到 pubspec.yaml 中，但如何注册？

我该如何玩？

我已经检查了这两个答案: How to play a custom sound in Flutter?

Flutter - Play custom sounds updated?

但是第一个太旧了，第二个使用 URL 作为声音路径:const kUrl2 = "http://www.rxlabz.com/labz/audio.mp3"; 和我喜欢播放的声音在应用程序中，而不是在线播放。那么...我该怎么做？

这是我当前的代码，如您所见，只有一个 float 按钮。我需要在我在代码中声明的位置开始播放声音。

但 visual studio 以红色下划线显示各个部分:await:表示无法识别await。audioPlugin.play: 是说 It's also unrecognized

import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() => runApp(new MyApp());

Directory tempDir = await getTemporaryDirectory();
File tempFile = new File('${tempDir.path}/demo.mp3');
await tempFile.writeAsBytes(bytes, flush: true);
AudioPlayer audioPlugin = new AudioPlayer();


class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {


  void _incrementCounter() {
    setState(() {
      print("Button Pressed");

      ///
      /// 
      /// 
      /// Here I Need To start Playing the Sound
      /// 
      /// 
      /// 
      /// 
      audioPlugin.play(tempFile.uri.toString(), isLocal: true);

    });
  }



  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(),
      floatingActionButton: new FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: new Icon(Icons.add),
      ),
    );
  }
}

Answer 1

它不漂亮，但是......

将mp3文件添加到assets文件夹，添加到pubspec.yaml喜欢this .

使用 rootBundle.load(asset) 将 Assets 作为二进制数据加载

使用 path_provider获取应用程序的临时文件夹位置

使用正则 dart:io在 tempDir 中打开文件(也许使用 Assets 名称)并写 bytes

形成一个file来自临时文件名的 URL，格式为 file:///folderPath/fileName

将此传递给 audioplayer , 设置 isLocal为真(在 iOS 上需要)。

import 'dart:async';
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:audioplayer/audioplayer.dart';
import 'package:path_provider/path_provider.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Audio Player Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  AudioPlayer audioPlugin = AudioPlayer();
  String mp3Uri;

  @override
  void initState() {
    _load();
  }

  Future<Null> _load() async {
    final ByteData data = await rootBundle.load('assets/demo.mp3');
    Directory tempDir = await getTemporaryDirectory();
    File tempFile = File('${tempDir.path}/demo.mp3');
    await tempFile.writeAsBytes(data.buffer.asUint8List(), flush: true);
    mp3Uri = tempFile.uri.toString();
    print('finished loading, uri=$mp3Uri');
  }

  void _playSound() {
    if (mp3Uri != null) {
      audioPlugin.play(mp3Uri, isLocal: true);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Audio Player Demo Home Page'),
      ),
      body: Center(),
      floatingActionButton: FloatingActionButton(
        onPressed: _playSound,
        tooltip: 'Play',
        child: const Icon(Icons.play_arrow),
      ),
    );
  }
}