MobileCRM.Platform.preventBackButton - Resconet/JSBridge GitHub Wiki

Prevents application to close when HW back button is pressed and installs handler which is called instead.

Pass "null" handler to allow the HW back button.

Works only under OS having HW back button (Android, Windows 10).

Argument	Type	Description
handler	function()	Handler function which will be called each time when user presses the Android HW back button.