为您的应用程序基础的活动，并覆盖的onCreate设置的主题。源于这个基地活动所有其他活动。

Create a base Activity for your app and override onCreate to set the theme. Derive all your other activities from this base Activity.

另外，请查阅本教程： http://www.androidengineer.com/2010/06/using-themes-in-android-applications.html

Also check this tutorial: http://www.androidengineer.com/2010/06/using-themes-in-android-applications.html