Android notification icon is a white circle

You must use a notification icon with no background. Android will add the circle background.

You can set background color with

.setColor(context.getResources().getColor(R.color.colorPrimary))

to match your app indentity.

Icon inside will remain white and circle will get the color you defined.

If your compileSDKversion is above 20 then notification icon should be a white-on-transparent background image. Otherwise the image will be rendered as a white colored image.

Please go through the below link too for guidelines to create the icon

https://www.google.com/design/spec/patterns/notifications.html

and also the notification icon generator.

https://romannurik.github.io/AndroidAssetStudio/icons-notification.html#source.space.trim=1&source.space.pad=0&name=ic_stat_example

It seems to be a problem of cache during compilation ... The first image I was using was bad (fully colored), so I think my compilator created somekind of cache on the filename.

I work on Windows and did this : uninstall the app from my phone, invalidate all cache from Android sudio => at re-compilation, the icon was OK.