That's stupid tutorial bacause you're suggest wrong value!
You suggest value: #000000 - 6 x "0" char. But standard value have 8 chars!
Proffesional/Correct value are: #FF000000 - like your's "notification_panel_solid_background" on the screenshot!
You are use RedGreenBlue HEX (#RGB) mode, but Android here use TransparencyRedGrenBlue HEX (#TRGB) mode.
If you something do, make it as you wish that others do it for you - make it preffesional!
rowser - PM to me
- My webpage!