how to delete top notch in android studio without deleting action bar

when I run my code app is working completely without an error ,but but top notch bar is showing in white colour I cant see see the notification icons also, how to delete that


how to remove title bar android studio change

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

java class on oncreate() method in following define: