Android - Activity constructor

Question

I noticed that using the shortcut Alt + Insert and selecting the builders, it tries to create a constructor with each private property (e.g. cManager

Answer 1

Android activities can have constructors as long as they take zero arguments. And in fact there is such a constructor as soon as you initialize any field when declaring it.

But as your log says, System services not available to Activities before onCreate(), so you can't call getSystemService from the constructor.

So the code in https://stackoverflow.com/a/28636652/53974 is correct, but the reason isn't.