Moodle for mobile

How to register the Android back button control

 
Picture of zhou Deng
How to register the Android back button control
 

I met a problem of android phone return key control :describ below
When I click on the android backbutton,it will put all of the page again, and not exit application.So,i try to registe the android back button like below33


But,it does not work.
Someone encountered this problem?  And then  how can i do to solve it.


Thanks!

 
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