Open whatsapp using button

[Yash_Agarwal_376 (Yash aggarwal)]

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Guide: How to start another app from my app (with activity starter)

There are several guides that teach us how to launch applications using activity starter. The problem is that they show us some examples and generally if we want to run some other application that is not in those guides, we can not do it because we lack data, such as packages and classes. And the guides in the community teach us to open the calculator, gmail and some other apps … but if we want to open a specific app, we do not know what data to put in the activity starter … To solve this I h…