Android how to make a compass?

Question

Android

Good day. I am writing an application for android. I found an example of such a compass on the net
here.
I would like the compass to show the direction to certain coordinates from my location. Please tell me in which direction to look for a solution?
an example in the application https://play.google.com/store/apps/details?id=com....
i.e. first we determine the location of the device and from it we point with an arrow to a certain city
how to do which way to dig?
thanks in advance