Activity 和 FragmentActivity 的区别
我在处理片段时遇到了两个被多次使用的 Activity 和 FragmentActivity.我想知道这两者之间有什么区别，因为当我用 FragmentActivity 更改 Activity 时，它对应用程序没有影响.
I was working on fragments and came across two things Activity and FragmentActivity which are used several times. I want to know that is there any difference between these two, because when I changed Activity with FragmentActivity, it had no effect on the app.
A FragmentActivity 是 Activity 的子类，专为 Android 支持包.
A FragmentActivity is a subclass of Activity that was built for the Android Support Package.
FragmentActivity 类添加了几个新方法以确保与旧版本的 Android 兼容，但除此之外，两者之间确实没有太大区别.只需确保将所有对 getLoaderManager() 和 getFragmentManager() 的调用更改为 getSupportLoaderManager() 和 getSupportFragmentManager() 分别.
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.