In a web browser the first field in a form has the focus and is active when the form is loaded.  This is not true on the iOS or Android apps.  The filed must be tapped to bring up the keyboard.

Is there any way to give the field the focus and make it active automatically?  My application uses a keyboard wedge barcode reader.  If the field is not active, the scans are not entered.  It is a common error for the user to forget to tap on the field.  I'd like to avoid this by making the field activate automatically.