Date and Time opaque over captured photo ! how anyone plz

Hi,
I'm a total newbie to android studio so please forgive me , though I have been programing with VB for over 15 years

I have captured a picture by calling the camera app
amera_intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
I have dealt with the duplicate that appears in the gallery by deleting it however


Now I want to add a 'date and time stamp' in the corner of the picture preferably opaque

do I need to reload the picture add the details then save it or can they be written to the camera app in some way ?

please can anyone tell me how I can achieve this

hoping someone can help

thanks

stef