You need to use a Theme.AppCompat theme (or descendant) with this activity

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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test2/com.example.test2.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity

创建的activity是MainActivity extends ActionBarActivity这样的。把后面的ActionBarActivity改成Activity，然后导包，把下面报错的地方删掉运行就不报错了

You need to use a Theme.AppCompat theme (or descendant) with this activity

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原文地址：http://blog.csdn.net/szstephenzhou/article/details/45010935