Change Icon Size Android Application. Open the app and tap the screen. This ide is awesome, a lot of tool belong here that you can use for free.
Replace both these images in each of the mipmap folders. Leaving the name @mipmap/ic_launcher will cause a error: Launcher icon represents your application & appear on the home screen.
The default app icon set up:
Android application icon means the main menu icon which is shows with other icons on android main menus screen. Icon can be chosen from gallery and lots of icon packs. You can go to run and check the icon, if it is changed or not. Resizing and compressing an image is sometimes very useful.