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

1.错误描述：

FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.best.keke.tabdemo01/com.best.xxxx.tabdemo01.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.FATAL EXCEPTION: main java.lang.