Audio Message Focus Listener

[05nelsonm]

Playing an audio message gains focus, but upon pausing and/or completion, is not abandoning that focus and then re-requesting focus again. This is attributed to the use of ApplicationContext, whereby the current listener cannot be re-registered after abandoning.

Reproduce:

• While listening to podcast or some other audio external to the chat, play an audio message
• let audio message complete
• Play previous podcast or some other audio external to the chat.
• Play the audio message
  • Audio message plays over top the podcast

Refactor AudioPlayerControllerImpl by moving listener interface to an internal class such that a new request can be completed with a new listener when audio focus is requested.