Android status bar icon color selection

Question

I downloaded black and white icons from Google Material Icon and I have two questions:

1. Is the color of notification bar always black in different SDK versions or device vendor themes? So I should use the white icons.

2. If not, how can I select the right icon color

Answer 1

1- Is the color of notification bar always Black in different SDK versions or device vendor themes? So I should use the White Icons.

different vendors can change the theme to however they want. In lollipop the notification bar is not black it can me many colors and any app change change the notification bar color to fit their app color when the user is in it.

2- If not, how can I select the Right icon color

You should follow the Design Guidelines on Notifications and use white icons, in lollipop your icons are automatically converted to white no matter what