Overlapping shadow effect remains on Navigation Drawer's NavigationView

Question

I have refined the Navigation Drawer Activity project template of Android Studio, which uses Toolbar, v7.app.ActionBarDrawerToggle and

Answer 1

At last, I made it.

The solution is using FLAG_LAYOUT_NO_LIMITS together with FLAG_FULLSCREEN to the android.view.Window object.

getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN
        | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);

This has gotten rid of both of the shadows perfectly.

lcw_gg's comment was very useful clue to manipulating android.view.Window. Special thanks to him.