<item name="android:windowDrawsSystemBarBackgrounds">true</item>

<item name="android:statusBarColor">@color/primary_dark</item>

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

            Window w = getWindow(); // in Activity's onCreate() for instance

            w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);

        }