Android開発中に起こったThemeに関するエラー

Project作ってFullscreenで何か作ろうかなと思った時に発生したエラーがこちら

Java

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02-0921:47:43.41131033-31033/?E/AndroidRuntime:FATALEXCEPTION:main

                                                  Process:jp.co.fullscreen,PID:31033

                                                  java.lang.RuntimeException:UnabletostartactivityComponentInfo{jp.co.fullscreen/jp.co.fullscreen.MainActivity}:java.lang.IllegalStateException:YouneedtouseaTheme.AppCompattheme(ordescendant)withthisactivity.

                                                      atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)

                                                      atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)

                                                      atandroid.app.ActivityThread.-wrap11(ActivityThread.java)

                                                      atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)

                                                      atandroid.os.Handler.dispatchMessage(Handler.java:102)

                                                      atandroid.os.Looper.loop(Looper.java:148)

                                                      atandroid.app.ActivityThread.main(ActivityThread.java:5417)

                                                      atjava.lang.reflect.Method.invoke(NativeMethod)

                                                      atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

                                                      atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

                                                    Causedby:java.lang.IllegalStateException:YouneedtouseaTheme.AppCompattheme(ordescendant)withthisactivity.

                                                      atandroid.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:310)

                                                      atandroid.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:279)

                                                      atandroid.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:253)

                                                      atandroid.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)

                                                      atjp.co.fullscreen.MainActivity.onCreate(MainActivity.java:11)

                                                      atandroid.app.Activity.performCreate(Activity.java:6251)

                                                      atandroid.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)

                                                      atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)

                                                      atandroid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 

                                                      atandroid.app.ActivityThread.-wrap11(ActivityThread.java) 

                                                      atandroid.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 

                                                      atandroid.os.Handler.dispatchMessage(Handler.java:102) 

                                                      atandroid.os.Looper.loop(Looper.java:148) 

                                                      atandroid.app.ActivityThread.main(ActivityThread.java:5417) 

                                                      atjava.lang.reflect.Method.invoke(NativeMethod) 

                                                      atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 

                                                      atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)<br>

非常に長いので必要な部分だけ取り出してみてみました

 

java.lang.RuntimeException: Unable to start activity ComponentInfo{jp.co.fullscreen/jp.co.fullscreen.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

 

内容としてはAppCompatActivityを継承してるんだからThemeにTheme.AppCompatまたはTheme.AppCompatを含んだThemeを指定しろ

ということでした

なのでMainActivity内のAppCompatActivityをActivityに変えて