Need timeout for QR code scanner module

[Nhan Le Duy]

Dear Developer Team and Friends

I want to set a timeout for QR scan module in redmobile but can not succeed. Could you please give me a solution for it. 

I also try to send android intent (red built-in) for back action button to close camera in scan mode but it do not work.

Please support me.

My project use remobile for temperature measurement and QR scan at my school.

Please see the photo