detect when screen turns off in windows phone

Question

Is there any way to detect when the screen turns off in the windows phone? It is possible to make the application run when this happens?

Answer 1

You should set ApplicationIdleDecectionMode to Enabled and handle Obscured and Unobscured events of root frame:

Microsoft.Phone.Shell.PhoneApplicationService.Current.ApplicationIdleDetectionMode = IdleDetectionMode.Enabled;
      var rootFrame = App.Current.RootVisual as PhoneApplicationFrame;
      if(rootFrame != null)
      {
        rootFrame.Obscured += new EventHandler<ObscuredEventArgs>(rootFrame_Obscured);
        rootFrame.Unobscured += new EventHandler(rootFrame_Unobscured);
      }

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