So, you need to edit values in "status_ bar_expanded_header.xml", found in res/layout, and "colors.xml", found in res/values.
In status bar_exapnded_header.xml, change the value in red (its right at the top) to the hex color of your choice. Your's will be a bit different, as this is from the S6:
Code:
<com.android.systemui.statusbar.phone.StatusBarHeaderView android:layout_gravity="clip_horizontal" android:id="@id/header" android:background="[COLOR="Red"]@drawable/notification_header_bg[/COLOR]" android:descendantFocusability="afterDescendants" android:layout_width="@dimen/notification_panel_width" android:layout_height="@dimen/status_bar_header_height" android:baselineAligned="false" android:paddingStart="@dimen/notification_side_padding" android:paddingEnd="@dimen/notification_side_padding"
In colors, change the value for the following to the color you want:
Code:
<color name="notification_header_bg_tw">
There are more changes you can make in colors.xml (e.g., button color, etc.), and they should be apparent once you get in there...
I attach a status_bar_exanded_header.xml and colors.xml from an "AOSP-style" notification/quick settings area I did for the s6 for your reference.
Please feel free to ask in the thread or via PM if you need help on this. I may release a ROM with some theme options, but I am not sure, as I haven't released one in years and am not sure I have the time to properly maintain it. If I do, or even make one for my own use, I'll post the SystemUI.apk.
Steve