Hi, Im trying to make a basic app

I was reading this about how to make a settings page for an app http://developer.android.com/guide/topics/ui/settings.html and according to this 

 

 

• If your app supports versions of Android older than 3.0 (API level 10 and lower), you must build the activity as an extension of the PreferenceActivity class.
• On Android 3.0 and later, you should instead use a traditional Activity that hosts a PreferenceFragmentthat displays your app settings. However, you can also use PreferenceActivity to create a two-pane layout for large screens when you have multiple groups of settings.

So this means if I want my app to support 2.2 and 2.3 (as alot of devices still have) I need to use the PreferenceActivity class, And if I do will my app still be compatible with 4.0, 4.1, 4.2, 4.3 and 4.4?

Ive tried doing this and have had a bit of trouble :/