问题
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, ActivityCompat or ContextCompat. I don't understand what are the difference between the two and their trade-offs.
Thank you for time.
回答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):
来源：https://stackoverflow.com/questions/38229842/whats-the-difference-between-activitycompat-and-contextcompat