android - 使用Fragment时出现了奇怪的错误

Question

API版本是23

Answer 1

Try getSupportFragmentManager()

Answer 2

There are two situations when creating a new extends Fragment inherited by a fragment. One is to import the app, in which case getFragmentManager() is used.
But the default is to inherit v4, this uses getSupportFragmentManager().
So you change fragment to import app, or change it to getSupportFragmentManager()

Answer 3

I agree with what you said above. Which package does Fragment use? Please confirm it