从资产 flutter 中播放音频

Question

你好，我正在使用 just_audio 来播放 mp3，据我所知，从 url 播放音频，我们可以使用这样的东西：

UriAudioSource _createAudioSource(MediaItem mediaItem) {
    return AudioSource.uri(
      Uri.parse(mediaItem.extras!['url']),
      tag: mediaItem,
    );
  }

我想知道有没有办法从本地资源玩它？

Answer 1

你可以这样使用

var data=await player!.setAsset('assets/mb3.mp3');

在示例 Mp3中设置资源pubsec.yaml

  assets:
    - assets/

更多信息

样本代码

import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart';

AudioPlayer? player;

void main() {
  player = AudioPlayer();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      initialRoute: AppRoutes.home,
      routes: {
        "${AppRoutes.home}": (context) => Home(),
      },
      title: _title,
      // home: ,
    );
  }
}

class Home extends StatelessWidget {
  const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("title")),
      body: const Center(
        child: AudioPlayers(),
      ),
    );
  }
}

class AppRoutes {
  static String home = "/";
}

Duration _position = Duration(seconds: 0);
var _progress = 0.0;

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

  @override
  State<AudioPlayers> createState() => _AudioPlayersState();
}

class _AudioPlayersState extends State<AudioPlayers> {
  Timer? timer2;

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.all(8),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          LinearProgressIndicator(
            value: _progress,
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              IconButton(
                  onPressed: () {
                    player!.setAsset('assets/mb3.mp3').then((value) {
                      return {
                        _position = value!,
                        player!.playerStateStream.listen((state) {
                          if (state.playing) {
                            setState(() {
                              _progress = .1;
                            });
                          } else
                            switch (state.processingState) {
                              case ProcessingState.idle:
                                break;
                              case ProcessingState.loading:
                                break;
                              case ProcessingState.buffering:
                                break;
                              case ProcessingState.ready:
                                setState(() {
                                  _progress = 0;
                                  timer2!.cancel();
                                });
                                break;
                              case ProcessingState.completed:
                                setState(() {
                                  _progress = 1;
                                });
                                break;
                            }
                        }),
                        player!.play(),
                        timer2 =
                            Timer.periodic(new Duration(seconds: 1), (timer) {
                          setState(() {
                            _progress += .05;
                          });
                        })
                      };
                    });
                  },
                  icon: Icon(
                    _progress > 0 ? Icons.pause : Icons.play_circle_fill,
                    size: 45,
                  )),
              SizedBox(
                width: 45,
              ),
              IconButton(
                  onPressed: () {
                    player!.stop();
                    timer2!.cancel();
                  },
                  icon: Icon(
                    Icons.stop,
                    size: 45,
                  )),
            ],
          ),
        ],
      ),
    );
  }
}

Answer 2

只需使用此方法将您的文件转换为 url，

setAudioSource(AudioSource.uri(Uri.parse('asset:/your_file.mp3')),
    initialPosition: Duration.zero, preload: true);