1.没有为Application或Activity指定主题

Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
                                                                   at android.support.v7.app.AppCompatDelegateImplBase.onCreate\(AppCompatDelegateImplBase.java:122\)

                                                                   at android.support.v7.app.AppCompatDelegateImplV7.onCreate\(AppCompatDelegateImplV7.java:146\)

                                                                   at android.support.v7.app.AppCompatActivity.onCreate\(AppCompatActivity.java:59\)

                                                                   at com.sean.zq.android.view.MainActivity.onCreate\(MainActivity.java:17\)