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

創建的第一個應用打開模擬器報錯如下：

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

解決辦法：把extends ActionBarActivity改成extends Activity，導包之後就正常運行了。這是因爲Android studio默認創建的時候是集成了ActionBarActivity