What's the difference between ActivityCompat and ContextCompat?

Question

I\'m trying to use the Android camera, for API 23 or above, it requires asking for permission at runtime. According to the documentation, I can accomplish that using, ActivityCo

Answer 1

I don't understand what are the difference between the two and their trade-offs

There's no trade-off really. Not sure why they wrote so - checkSelfPermission() is a method of ContextCompat and ActivityCompat is subclass (child) of ContextCompat so you can pass either one whenever object of ContextCompat class is required.

Inheritance hierarchy (docs):