Is it possible to integrate one mobile application with other mobile application in Android and IOS? User have both applications installed on his mobile. He is inside one app and let's assume, he want's to perform some operation on another app and once that operation is done, I should get informed in my first app.
Let's take one simple scenario. I have an app which takes photos. After clicking photo, I should get an option of sharing the same on WhatsApp lets say, which will open a WhatsApp and I select a user/group to share that picture and once it is posted there it should redirect to my app and in my mobile app, that photo should be marked like "Shared on WhatsApp" or some right check.
How could I achieve such type of functionality in Android and IOS both? How 2 mobile app communicate with each other?