[안드로이드] Overlay 화면 만들기 오류 좀 봐주세요

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http://milkissboy.tistory.com/46 이 링크에서 나온대로 그대로 따라해서 스마트폰에 넣어서 확인을 해보는데 처음에 다른앱위에 그리기 권한을 허용해달라고 나온뒤에 허용을 해주면 어플이 튕겨버립니다... 오류 로그는 08-14 19:50:02.380 15349-15349/? E/Zygote: isWhitelistProcess - Process is Whitelisted 08-14 19:50:03.804 15349-15349/com.example.starz.overlay_service E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.ssdw.overlay_service, PID: 15349 java.lang.RuntimeException: Unable to create service com.example.ssdw.overlay_service.MyService: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W&#64;7476a48 -- permission denied for window type 2003 at android.app.ActivityThread.handleCreateService(ActivityThread.java:3554) at android.app.ActivityThread.-wrap4(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1786) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6940) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W&#64;7476a48 -- permission denied for window type 2003 at android.view.ViewRootImpl.setView(ViewRootImpl.java:977) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:381) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:100) at com.example.ssdw.overlay_service.MyService.onCreate(MyService.java:52) at android.app.ActivityThread.handleCreateService(ActivityThread.java:3544) at android.app.ActivityThread.-wrap4(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1786) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6940) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 이거구요.. 로그에서 파란색으로 오류나는 52번째 라인은 wm.addView(mView, params);입니다.. 어떻게 해야 오류를 해결할수 있을까요

[안드로이드] Overlay 화면 만들기 오류 좀 봐주세요

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