How to periodically scan for bluetooth devices on android

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Hi this may sound as a stupid question.But I was unable to find any answers for this, thus posting here.

I am building an indoor application which continuously scans the bluetooth dongles located at different locations in a place like a mall or library.As I move in the mall with android phone in my hand I should be able to get the nearest dongle which I can connect to(Stupid Idea but I want to do something else with this).For this I should be able to continuously scan for the bluetooth devices.

Please can someone tell me how do I make android scan the available Bluetooth devices periodically.

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