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

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

 

創建的activity是MainActivity extends ActionBarActivity這樣的。把後面的ActionBarActivity改成Activity，然後導包，把下面報錯的地方刪掉運行就不報錯了