導航到Windows Phone 8的Lens應用程序中的按鈕單擊事件

Question

在Windows Phone的默認相機應用程序中按我的應用程序的“鏡頭”平鋪圖標后，我想導航到我的應用程序。 盡管我正在使用CameraCaptureTask拍攝照片，然后將其保存並顯示在MainPage中，但我仍在工作。 我在單擊事件上調用CameraCaptureTask，所以我的問題是，當我在鏡頭選擇器中選擇“應用程序磁貼”時，如何訪問此單擊事件？

App.xaml.cs

private void InitializePhoneApplication()
    {
        if (phoneApplicationInitialized)
            return;

        // Create the frame but don't set it as RootVisual yet; this allows the splash
        // screen to remain active until the application is ready to render.
        //RootFrame = new PhoneApplicationFrame();
        RootFrame = new TransitionFrame();
        RootFrame.Navigated += CompleteInitializePhoneApplication;

        // Assign the lens example URI-mapper class to the application frame.
        RootFrame.UriMapper = new LensUriMapper();

        // Handle navigation failures
        RootFrame.NavigationFailed += RootFrame_NavigationFailed;

        // Handle reset requests for clearing the backstack
        RootFrame.Navigated += CheckForResetNavigation;

        // Ensure we don't initialize again
        phoneApplicationInitialized = true;
    }

LensUriMapper.cs

class LensUriMapper : UriMapperBase
{
    private string tempUri;

    public override Uri MapUri(Uri uri)
    {
        tempUri = uri.ToString();

        // Look for a URI from the lens picker.
        if (tempUri.Contains("ViewfinderLaunch"))
        {
            // Launch as a lens, launch viewfinder screen.
            //return new Uri("/Views/MainPage.xaml", UriKind.Relative);
            return new Uri("/Views/MainPage.xaml?Viewfinder=1", UriKind.Relative);
        }
        }

        // Otherwise perform normal launch.
        return uri;
    }
}

MainPage.xaml.cs

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    if (NavigationContext.QueryString.ContainsKey("Viewfinder"))
    {
        newButton_Click(null, null);
    }
}

void newButton_Click(object sender, EventArgs e)
    {            
        _cameraTask.Show();
    }

另外，如何按MSDN的鏡頭應用指南中所述的后退鍵直接導航回默認的相機應用程序？

Answer 1

您可以向ViewfinderLaunch uri添加參數：

return new Uri("/Views/MainPage.xaml?Viewfinder=1", UriKind.Relative);

接下來，您必須覆蓋MainPage的“ OnNavigatedTo”方法，以檢查是否設置了Viewfinder參數：

if (NavigationContext.QueryString.ContainsKey("Viewfinder"))
{
    newButton_Click(null, null);
}