I want to make two android apps with java one for the buyer and one for the seller each one has its front-end but they share the same back-end and database, and I want to add the feature that allows buyers to communicate with the seller using realtime message, is there a way to implement this or it is impossible?
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Yes, that's possible and a lot of applications work like this. Build 2 Android apps, communicate over REST with the backend and use Google Firebase for push notifications. – Jasper Huzen Jan 26 '20 at 19:38
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How do you think the eBay app works? – chrylis -cautiouslyoptimistic- Jan 26 '20 at 19:41
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the seller posts a product with many plans for one item or many items with reduction ex: many buyers want to buy the same product for getting a reduction so they contact the sellers using real-time message and arrange an appointment in seller's store and pay with cash (there is no e-commerce payment ) – benmazouz seif eddine Jan 26 '20 at 20:10
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Yes it is possible. You can add as many apps as you want for your project
See these answers Answer 1, Answer 2
See this question
majurageerthan
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what about real-time messages can a user from one app send a message to a user from the other app? – benmazouz seif eddine Jan 26 '20 at 20:17
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yes it is possible,one database can sync with many applications – majurageerthan Jan 26 '20 at 20:22