How to set the app icon as the notification icon in the notification drawer

Question

As shown in the figure...
I am getting my notification icon(on left to the red colour).
But I need to display the app icon as shown by the black arrow

Answer 1

I know its bit late to answer here and also its already been answered, but I came here looking for an easy fix using firebase notifications. Someone like me visiting here can do the solution by recommended and easy way of firebase notification, which is simply adding meta-data in manifest.

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