audio_session 0.0.3

Sets the iOS audio session category and Android audio attributes for your app, and manages your app's audio focus, mixing and ducking behaviour.

example/lib/main.dart

import 'dart:math';

import 'package:audio_session/audio_session.dart';
import 'package:flutter/material.dart';
import 'package:just_audio/just_audio.dart' as ja;

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

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

class _MyAppState extends State<MyApp> {
  final _player = ja.AudioPlayer();

  @override
  void initState() {
    super.initState();
    AudioSession.instance.then((audioSession) async {
      // This line configures the app's audio session, indicating to the OS the
      // type of audio we intend to play. Using the "speech" recipe rather than
      // "music" since we are playing a podcast.
      await audioSession.configure(AudioSessionConfiguration.speech());
      // Listen to audio interruptions and pause or duck as appropriate.
      _handleInterruptions(audioSession);
      // Use another plugin to load audio to play.
      await _player.setUrl(
          "https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3");
    });
  }

  void _handleInterruptions(AudioSession audioSession) {
    bool playInterrupted = false;
    audioSession.becomingNoisyEventStream.listen((_) {
      _player.pause();
    });
    _player.playingStream.listen((playing) {
      playInterrupted = false;
      // Temporary as the just_audio 0.3.4 doesn't activate the audio session.
      if (playing) {
        audioSession.setActive(true);
      }
    });
    audioSession.interruptionEventStream.listen((event) {
      if (event.begin) {
        switch (event.type) {
          case AudioInterruptionType.duck:
            if (audioSession.androidAudioAttributes.usage ==
                AndroidAudioUsage.game) {
              _player.setVolume(_player.volume / 2);
            }
            playInterrupted = false;
            break;
          case AudioInterruptionType.pause:
          case AudioInterruptionType.unknown:
            if (_player.playing) {
              _player.pause();
              // Although pause is async and sets playInterrupted = false,
              // this is done in the sync portion.
              playInterrupted = true;
            }
            break;
        }
      } else {
        switch (event.type) {
          case AudioInterruptionType.duck:
            _player.setVolume(min(1.0, _player.volume * 2));
            playInterrupted = false;
            break;
          case AudioInterruptionType.pause:
            if (playInterrupted) _player.play();
            playInterrupted = false;
            break;
          case AudioInterruptionType.unknown:
            playInterrupted = false;
            break;
        }
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('audio_session example'),
        ),
        body: Center(
          child: StreamBuilder<ja.PlayerState>(
            stream: _player.playerStateStream,
            builder: (context, snapshot) {
              final playerState = snapshot.data;
              if (playerState?.processingState != ja.ProcessingState.ready) {
                return Container(
                  margin: EdgeInsets.all(8.0),
                  width: 64.0,
                  height: 64.0,
                  child: CircularProgressIndicator(),
                );
              } else if (playerState?.playing == true) {
                return IconButton(
                  icon: Icon(Icons.pause),
                  iconSize: 64.0,
                  onPressed: _player.pause,
                );
              } else {
                return IconButton(
                  icon: Icon(Icons.play_arrow),
                  iconSize: 64.0,
                  onPressed: _player.play,
                );
              }
            },
          ),
        ),
      ),
    );
  }
}