I have a question about Android Google Map API ㅜㅜ

I want to display the current location using Google Map API, but when I looked up the example, most of the codes were in between It has not been implemented yet because of the embedded replicated functions or classes (LocationRequest, getmap, PlacesListener) If you look at the examples of stackoverflows, they're not being tested because they have a function that's been duplicated.

Please let me know the site where the example is well organized related to Google Map (foreign sites don't matter either).)