requestFeature() must be called before adding content 오류

오류 코드 -

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        requestWindowFeature(Window.FEATURE_NO_TITLE)
 }

오류 메세지 -

2019-12-26 16:36:23.604 11148-11148/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.instamacro.useragentinstacheck, PID: 11148
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.instamacro.useragentinstacheck/com.instamacro.useragentinstacheck.MainActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6944)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
     Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
        at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:385)
        at android.app.Activity.requestWindowFeature(Activity.java:4269)
        at com.instamacro.useragentinstacheck.MainActivity.onCreate(MainActivity.kt:26)
        at android.app.Activity.performCreate(Activity.java:7183)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6944) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 

 

 

xml 컨텐츠를 Activity에 붙이고(setContentView) requestWindowFeature를 호출하면 해당 오류가 뜬다.

 

requestWindowFeature(Window.FEATURE_NO_TITLE)
setContentView(R.layout.activity_main)

requestWindowFeature 호출을 한 후에 setContentView를 하면 오류없이 작동한다.

 

즉 setContentView와 requestWindowFeature 코드의 순서 문제