本文主要是介绍FragmentActivity和Activity的区别及何时使用两者，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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
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