问题
Is it possible to change the background image of the start screen from an app? Example: I have an generated image within the app and want to set it as background image (for tiles) of my start screen in windows phone 8.1 by a simple tap on a button.
回答1:
Unfortunately, there is currently no API that allows changing the Windows Phone 8.1 Start Screen background image programmatically.
来源：https://stackoverflow.com/questions/23081357/image-background-for-start-screen-in-wp-8-1