No clear explaination for using multiple handler

[FireLord]

Documentation request for the following page(s)

https://pub.dev/packages/audio_service

Section(s) in question

Advanced features Compose multiple audio handler classes:

_audioHandler = await AudioService.init( builder: () => AnalyticsAudioHandler( PersistingAudioHandler( MyAudioHandler())), );

Suggested improvement

There is no function related to AnalyticsAudioHandler, no proper guide to access particular handler when using the play pause function

[ryanheise]

The idea is that you can create your own custom handler as a subclass of CompositeAudioHandler. You could create multiple of these, such as AnalyticsAudioHandler and PersistingAudioHandler. Those are not built-ins, they would be examples of custom classes you would write yourself. You can click on API documentation to read the documentation for CompositeAudioHandler, but I will grant that it is not detailed. However, there is an example in the examples directory.

[FireLord]

Okay with help of example I was able to achieve what I wanted. Thank you @ryanheise for quick response!

Here is code snippet for someone who's looking for same.

1. You have to create your two or more handler like you normally do
2. Then create a MainSwitchHandler

   
   import 'package:audio_service/audio_service.dart';

class MainSwitchHandler extends SwitchAudioHandler { final List handlers;

MainSwitchHandler(this.handlers) : super(handlers.first);

@override Future customAction(String name, [Map<String, dynamic>? extras]) async { switch (name) { case 'switchToHandler': stop(); final index = extras!['index'] as int; inner = handlers[index]; return null; default: return super.customAction(name, extras); } } }

3. Then init your AudioService like this. I'm using get_it to inject here
```dart
  sl.registerSingletonAsync<AudioHandler>(() async {
    return AudioService.init(
      builder: () => MainSwitchHandler([
        AudioPlayerHandler(),
        StoryPlayerHandler(),
      ]),
      config: const AudioServiceConfig(
        androidNotificationChannelId: 'com.music.focusflow.channel.audio',
        androidNotificationChannelName: 'Audio playback',
        androidNotificationOngoing: true,
        androidNotificationIcon: 'mipmap/ic_launcher',
      ),
    );
  });

4. Then create a extension on AudioHandler

   extension AudioHandlerExtension on AudioHandler {
   Future<void> switchToHandler(int? index) async {
   if (index == null) return;
   final AudioHandler audioHandler = sl();
   await audioHandler.customAction('switchToHandler', <String, dynamic>{'index': index});
   }
   }

5. Then you can switch it like this with respect to order of making the list. Here audioHandler is injected from the get_it.

   audioHandler.switchToHandler(0);

6. For more details you can check the example here

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