FragmentActivity和Activity的区别及何时使用两者

区别：A

FragmentActivity

is
a subclass of

Activity

that
was built for the Android
Support Package.

The

FragmentActivity

class
adds a couple new methods to ensure compatibility with older versions of Android, but other than that, there really isn't much of a difference between the two. Just make sure you change all calls to

getLoaderManager()

and

getFragmentManager()

to

getSupportLoaderManager()

and

getSupportFragmentManager()

respectively.

使用：use

Activity

if
you are using

android.app.Fragment

;
use

FragmentActivity

if
you are using

android.support.v4.app.Fragment

.
Never attach a

android.support.v4.app.Fragment

to
a

android.app.Activity

,
as this will cause an exception to be thrown.

http://stackoverflow.com/questions/10477997/difference-between-activity-and-fragmentactivity