from some of the answer such as
Using getFragmentManager() vs getSupportFragmentManager()?
I find that getFragmentManager() is used for API>=14,
and getSupportFragmentManager() will be used in support lib such as v4 which also support older API.
So my question is should I just use getSupportFragmentManager (import the support.v4 for each classes) so that my application can be used in any API version?
And are there any different I should know between these 2 FragmentManager?