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As per Android L developers guide here,

The system ignores all non-alpha channels in action icons and the main notification icon. You should assume that these icons are alpha-only.

So my question is very simple: what are alpha-only icons? and how does it affect the UI? What are the things that I have to update in my project which was targeted previously for jelly bean?

I searched on google but couldn't find any answer for this.

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xyz
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1 Answers1

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Alpha is from a graphical background, and in Google docs it refers to Icons with transparent Background

Graphical definition

Alpha channels are masks through which you can display images. The alpha channel is an 8-bit channel, which means it has 256 levels of gray from 0 (black) to 255 (white). White acts as the visible area; black acts as the transparent area

Nadir Belhaj
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  • can you answer second? - What are the things that I have to update in my project which was targeted previously for jelly bean? – xyz Sep 17 '14 at 15:53
  • which means they are saying that icons in notifications must be with transparent background? right? – xyz Sep 17 '14 at 15:56
  • only background need to be transparent? – xyz Sep 17 '14 at 15:58