Windows 10 BackgroundMediaPlayer SystemTransportControls暫停按鈕不起作用

我最近決定在我的應用程序中爲播客添加背景音頻播放支持。我已經掌握了大部分工作，但BackgroundMediaPlayer的SystemTransportControls中的暫停按鈕似乎沒有任何作用。Windows 10 BackgroundMediaPlayer SystemTransportControls暫停按鈕不起作用

這裏是我的背景音頻任務的類文件：

public sealed class AudioPlayer : IBackgroundTask 
{ 
    private BackgroundTaskDeferral _deferral; 
    public void Run(IBackgroundTaskInstance taskInstance) 
    { 
     _deferral = taskInstance.GetDeferral(); 

     var control = BackgroundMediaPlayer.Current.SystemMediaTransportControls; 
     control.IsEnabled = true; 
     control.IsPauseEnabled = true; 
     control.IsPlayEnabled = true; 
     control.IsNextEnabled = false; 
     control.IsPreviousEnabled = false; 

     taskInstance.Canceled += TaskInstance_Canceled; 

     BackgroundMediaPlayer.MessageReceivedFromForeground += BackgroundMediaPlayer_MessageReceivedFromForeground; 
    } 

    private void TaskInstance_Canceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason) 
    { 
     BackgroundMediaPlayer.Shutdown(); 
     _deferral.Complete(); 
    } 

    void BackgroundMediaPlayer_MessageReceivedFromForeground(object sender, MediaPlayerDataReceivedEventArgs e) 
    { 
     object obj; 
     e.Data.TryGetValue("MessageBody", out obj); 

     string url = (string)obj; 
     url = url.Replace("\"", ""); 
     var source = MediaSource.CreateFromUri(new Uri(url, UriKind.Absolute)); 

     var list = new MediaPlaybackList(); 
     list.Items.Add(new MediaPlaybackItem(source)); 

     BackgroundMediaPlayer.Current.Source = list; 
     BackgroundMediaPlayer.Current.Play(); 
    } 
}

重要的是要注意的是，音頻無法開始播放的背景，但我沒有暫停音頻的能力是非常重要的。

感謝， P.

來源

2016-07-04 Pranav Kulkarni

作出反應SystemMediaTransportControls（SMTC），並處理每一個通用音量控制（UVC）鍵：播放，暫停，下一個，和以前的，我們需要處理SystemMediaTransportControls.ButtonPressed event在Run方法像以下：

public void Run(IBackgroundTaskInstance taskInstance) 
{ 
    var control = BackgroundMediaPlayer.Current.SystemMediaTransportControls; 
    control.ButtonPressed += control_ButtonPressed; 
    ... 
}

而且在control_ButtonPressed方法，處理像不同的按鈕：

private void control_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs args) 
{ 
    switch (args.Button) 
    { 
     case SystemMediaTransportControlsButton.Play: 
      //Todo with play 
      break; 
     case SystemMediaTransportControlsButton.Pause: 
      //Todo with pause 
      break; 
     case SystemMediaTransportControlsButton.Next: 
      //Todo with skip to next; 
      break; 
     case SystemMediaTransportControlsButton.Previous: 
      //Todo with skip to previous; 
      break; 
    } 
}

有關完整示例，請參閱GitHub上的官方Background audio sample，尤其是MyBackgroundAudioTask class。還有一個非常好的帖子，可以引導您設置背景音頻，響應設備媒體控件，與後臺媒體播放器進行通信以及管理播放列表。閱讀更多信息，請致電The Basics of Background Audio。

來源

2016-07-05 07:49:18

Windows 10 BackgroundMediaPlayer SystemTransportControls暫停按鈕不起作用

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