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Question about SDK and app alerts?
Is it possible to realise an app that is available one more than one SDK. As many ppl still use older phones. Also if I have an app, let's say a store app and i just want 2 allow my customers to know that new products have arrived do I have to update and release it again or can i send some sort of alert to my customers without them having to update the app on thie phone? Thanks in advance.
To send an alert the two specific users, first you will need a way to distinguish them and their devices from the many that have your app, and secondly you can use "push notifications". This can become a very advanced topic if you want to implement the feature yourself. Or, the easy way is to find a third-party library that will do most of the work for you. They'll have tutorials also.
Those alerts you send to the specific users could just include text for a notification, or you can send data with it and update some of your views dynamically.
Production apps in Google Play will be sent to all users. To limit the users who receive the full app updates you can invite them to be a "beta tester" or you could even just email them the production APK directly.