CODEWITHSUNDEEP
windows-phone-7eventsaudioagent
onmyway133
onmyway133

Reputation: 48185

WP7 how to detect when audio track goes to end?

I'm using BackgroundAudioPlayer agent in my Windows Phone 7 application. When the track end, the agent side receives TrackEnded event, but UI side doesnot receive any events.

Also, when I intentionally set audio track 's position to its end, then call Play(), the agent side receives TrackEnded event (because the track has come to an end), but the UI side does receive Stopped in its PlayStateChanged handler. So weird !

How to let UI know that an track has come to an end ? Communicating through isolated storage is not my favorite !

Upvotes: 2

Views: 274

Answers (1)

Neil Turner
Neil Turner

Reputation: 2727

From research and a little testing, using Isolated Storage as a middle-man between Background and Foreground instances of the BackgroundAudioPlayer is still the only route for Windows Phone 7. The options are mentioned here (which I know you're aware of)...

http://blogs.msdn.com/b/wpukcoe/archive/2012/02/10/background-audio-in-windows-phone-7-5-part-2.aspx

http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh202944(v=vs.105).aspx

https://stackoverflow.com/a/11419680/247257

This was also confirmed by Peter Torr who said:

For example, the agent may need to tell the foreground “I just started pre-downloading the next track,” or “I updated a database table and you should refresh your state”. Such notifications are impossible to create with Windows Phone OS 7.1; at best you can model them by using polling techniques, but this approach is inefficient and prone to errors.

The only good news is that in the same post, he gives a solution (using named events for IPC) for Windows Phone 8 which is a lot more reliable...

http://blogs.windows.com/windows_phone/b/wpdev/archive/2013/03/27/using-named-events-to-coordinate-foreground-apps-and-background-agents.aspx

Upvotes: 1

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