Windows Phone 8 學習備忘（如何獲取手機屏幕的物理尺寸）

WP8的機子升級到WP8.1的Preview後，發現6寸屏幕的機器，鍵盤彈起的高度和之前不同了，App Bar的高度和裏面的字體大小不同了，爲了適配這一個變化，必須得獲取到手機屏幕的物理尺寸進行特殊處理，搜了一大圈，最後終於找到了這個間接的接口，微軟你的API藏的夠深的。http://blogs.windows.com/windows_phone/b/wpdev/archive/2013/11/22/taking-advantage-of-large-screen-windows-phones.aspx

string GetExtendedScreenInfo()

{

  object temp;

  if (!DeviceExtendedProperties.TryGetValue("PhysicalScreenResolution", out temp))

    return "not available, sorry";

 

  var screenResolution = (Size)temp;

 

  // Can query for RawDpiY as well, but it will be the same value

  if (!DeviceExtendedProperties.TryGetValue("RawDpiX", out temp) || (double)temp == 0d)

    return "not available, sorry";

 

  var dpi = (double)temp;

  var screenDiagonal = Math.Sqrt(Math.Pow(screenResolution.Width / dpi, 2) +

  Math.Pow(screenResolution.Height / dpi, 2));

 

  var width = App.Current.Host.Content.ActualWidth;

 

  return String.Format("{0} x {1}; {2:0.0#} raw scale; {3:0.0}\"",

    screenResolution.Width, screenResolution.Height, screenResolution.Width / width,

    screenDiagonal);

}