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BackgroundAudioPlayer Class (Microsoft.Phone ...
https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh220901(v=vs.105)
The BackgroundAudioPlayer type exposes the following members. ... Windows Phone OS. Supported in: 8.1, 8.0, 7.1. Platforms. Windows Phone. Thread Safety. Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
BackgroundAudioPlayer Dose not Exist in Windows Phone 8.1 ...
https://social.msdn.microsoft.com/Forums/en-US/7aa65ec0-6f2e-4e1f-8fe0-8434b624aebf/backgroundaudioplayer-dose-not-exist-in-windows-phone-81-universal-apps
As Simon told, the BackgroundAudioPlayer Class is not supported on Windows Phone 8.1 Runtime. If you need to play the music in background, SystemMediaTransportControls class is a good replacement. --James
BackgroundAudioPlayer.Play Method (Microsoft.Phone ...
https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh239295(v=vs.105)
Volume settings may not be retained in background audio player applications. This can occur if you set the Volume property first and then call the Play()()() method and then set the Track property. To resolve this issue, always set the track before calling the Play method. Version Information Windows Phone OS. Supported in: 8.1, 8.0, 7.1. Platforms
BackgroundAudioPlayer.Volume Property …
https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh239185(v=vs.105)
Volume settings may not be retained in background audio player applications. This can occur if you set the Volume property first and then call the Play()()() method and then set the Track property. To resolve this issue, always set the track before calling the Play method. Version Information Windows Phone OS. Supported in: 8.1, 8.0, 7.1. Platforms
BackgroundAudioPlayer.FastForward Method …
https://docs.microsoft.com/en-us/previous-versions/windows/apps/hh239204(v=vs.105)
In this article [ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation.. Starts fast-forwarding through the current AudioTrack.. Namespace: Microsoft.Phone.BackgroundAudio Assembly: Microsoft.Phone (in Microsoft.Phone.dll) Syntax
How to use background media player in Windows Phone ...
https://stackoverflow.com/questions/24007385/how-to-use-background-media-player-in-windows-phone-silverlight-8-1
The AudioPlayerAgent and AudioStreamingAgent classes, which supported background audio playback for Windows Phone 8 apps, are not supported in Silverlight 8.1. If you want to support background audio playback, you can continue to use a Windows Phone 8 app or create a Windows Phone Store app, which supports new background audio APIs.
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