Puzzle about power saving of device RRS feed

  • Question

  • My metro app has a background task, which is responsible for sending command to USB device periodically to query the information from device and using these information to update tile content. My puzzle is: how to keep power saving as much as possible? Because frequent query will result in power consumption of USB device.

    My idea is: send query command only when the tile of our metro app is now visable for users, that is, if any metro app is now runninig in full screen mode, then we can skip the sent of query command to device.

    So, my problem is: how to know our metro app tile is now visable for users? How to know there is no any metro app is running in full screen? And how to know users are now stay in Start Screen?

    Thank you.

    Wednesday, August 1, 2012 8:59 AM