beforeclosing event for browsers in i phone and android

beforeclosing event for browsers in i phone and android

In desktop, beforeunload event is working when I  try to close or reload my web page.
But It is not detecting when I close the browser in ipod or android phone.
Is there any other way to detecting the  browser[ chrome,safari,firefox] during closing by clicking the exit button or  by swiping the browser on background ?