It is may not be reasonable to use google API to show direction of place by embedding google map in your App. simply you can navigate to direction of a place on google map starting from your app. even without touching direction button on google map. use this block.
set ActivityStarter1.Action to "android.intent.action.VIEW"
set ActivityStarter1.DataUri to "https://www.google.com/maps/dir/?api=1&destination=LAT,LONG"
then call Start Activity