Adaptive app icon
Adaptive Icons is a feature of Android Oreo that is gradually being adopted by all Android applications. It is an icon that adapts according to the native shape of the system, making all the icons of that device combine with each other.
Fortunately, the Gitter android app icon is perfect for this feature, since it is a white icon (with a shadow) and a pink shape. Then it will not need any creativity or work for a new icon.
More info: https://developer.android.com/guide/practices/ui_guidelines/icon_design_adaptive.html
Edited by Eric Eastwood