upw,c#,启用后台播放控件

uwp音视频app,启用后台播放控件。 

启用控件

SystemMediaTransportControls systemMedia_TransportControls = SystemMediaTransportControls.GetForCurrentView();

systemMedia_TransportControls.IsPlayEnabled = true;
            systemMedia_TransportControls.IsPauseEnabled = true;
            systemMedia_TransportControls.ButtonPressed += SystemControls_ButtonPressed;

控件点击

private async void SystemControls_ButtonPressed(SystemMediaTransportControls sender,
   SystemMediaTransportControlsButtonPressedEventArgs args)
        {
            #region 后台控件点击事件
            switch (args.Button)
            {
                case SystemMediaTransportControlsButton.Play:
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                    {
                        //main_mediaElement.AutoPlay = true;
                        //main_mediaElement.Play();
                    });
                    break;
                case SystemMediaTransportControlsButton.Pause:
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                    {
                        //main_mediaElement.Pause();
                    });
                    break;
                case SystemMediaTransportControlsButton.Previous:
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                    {
                        //PreviousPlaySameMethod();
                    });
                    break;
                case SystemMediaTransportControlsButton.Next:
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                    {
                        //SameCodeMethod();
                    });
                    break;
                default:
                    break;
            }
            #endregion
        }

控件状态

#region 后台控件状态改变
            switch (main_mediaElement.CurrentState)
            {
                case MediaElementState.Playing:
                    systemMedia_TransportControls.PlaybackStatus = MediaPlaybackStatus.Playing;
                    break;
                case MediaElementState.Paused:
                    systemMedia_TransportControls.PlaybackStatus = MediaPlaybackStatus.Paused;
                    break;
                case MediaElementState.Stopped:
                    systemMedia_TransportControls.PlaybackStatus = MediaPlaybackStatus.Paused;
                    break;
                default:
                    break;
            }
            #endregion