I have seen quite a few apps do this. There is Universal Copy that allows you to copy any text from the currently visible screen. There are apps such as MySmartPrice that overlay a "bubble button" on top of Amazon app, reads the product name and searches for lower priced listings of the same product at other sites.
I understand this is done using Accessibility service on Android. Here are a couple of links discussing this:
http://stackoverflow.com/questions/...sibilityservice-and-evoking-ui-using-dra?rq=1
http://www.axovel.com/blog/2016/05/06/taking-accessibility-service-to-next-level-android/
Can we do this in B4A?
I understand this is done using Accessibility service on Android. Here are a couple of links discussing this:
http://stackoverflow.com/questions/...sibilityservice-and-evoking-ui-using-dra?rq=1
http://www.axovel.com/blog/2016/05/06/taking-accessibility-service-to-next-level-android/
Can we do this in B4A?