Hello, this is as beginner as it gets.

I'm creating an app that is basically a series of forms that collect
info from the user, and then display that info to the user as well as
allow them to modify it... very simple, almost no logic.

I have been reading about activities, but in my test, I noticed I can
easily change what appears on the screen when my app is running simply
by using setContentView method and passing it a reference to another
layout xml resource.

It feels "wrong" but seems to work, so I am wondering what problems
might arise from my approach.

When exactly should an app have multiple activities? When not?

Any input greatly appreciated.

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