(UWP)如何在Groove中激活"Taskbar Miniplayer“

Question

我使用我的应用程序的BackgroundMediaPlayer在后台播放音频。现在我看到了这些按钮：

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如何激活它们？

Answer 1

为了使任务栏中的媒体控件正常工作，您需要从前台应用程序和后台任务加载和配置SystemMediaTransportControls。

在前台应用程序中，您应该有以下代码：

var smtc = SystemMediaTransportControls.GetForCurrentView();
smtc.ButtonPressed += smtc_ButtonPressed;
smtc.PropertyChanged += smtc_PropertyChanged;
smtc.IsEnabled = true;
smtc.IsPauseEnabled = true;
smtc.IsPlayEnabled = true;
smtc.IsNextEnabled = true;
smtc.IsPreviousEnabled = true;

在后台任务中，您应该有：

smtc = BackgroundMediaPlayer.Current.SystemMediaTransportControls;
smtc.ButtonPressed += smtc_ButtonPressed;
smtc.PropertyChanged += smtc_PropertyChanged;
smtc.IsEnabled = true;
smtc.IsPauseEnabled = true;
smtc.IsPlayEnabled = true;
smtc.IsNextEnabled = true;
smtc.IsPreviousEnabled = true;

请注意，获取控件实例的API是不同的：

前台app为SystemMediaTransportControls.GetForCurrentView()，后台任务为BackgroundMediaPlayer.Current.SystemMediaTransportControls。

你必须支持两个(前景+背景)中的按钮按下事件

Answer 2

这是System Media Transport Controls，您应该添加代码来处理click事件。

以下是官方示例：

public MainPage()
{
this.InitializeComponent();

// Hook up app to system transport controls.
systemMediaControls = SystemMediaTransportControls.GetForCurrentView();
systemMediaControls.ButtonPressed += SystemControls_ButtonPressed;

// Register to handle the following system transpot control buttons.
systemMediaControls.IsPlayEnabled = true;
systemMediaControls.IsPauseEnabled = true;
}

async void SystemControls_ButtonPressed(SystemMediaTransportControls sender,
SystemMediaTransportControlsButtonPressedEventArgs args)
{
switch (args.Button)
  {
    case SystemMediaTransportControlsButton.Play:
        await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
        {
            mediaElement.Play();
        });
        break;
    case SystemMediaTransportControlsButton.Pause:
        await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
        {
            mediaElement.Pause();
        });
        break;
    default:
        break;
  }
}