Formula URL to Automatically Activate Scan Button on Mobile

On mobile, to activate the scan button, the user must tap the text box.  I need "something" to activate the scan button automatically when the user lands on my form.  I only have 1 text box and it will be receiving a scan.  It would be okay to have a button that saves the scan and goes to a new record and activates the scan button automatically.  I have been searching and trying out option on my own but can't seem to get away from the "3 tap" scan scenario.  Fast food restaurants will be using this to scan their inventory at receiving so I need it to be quick and easy.  Any input is appreciated.