Every application has an icon application. The default icon application is Flutter Icon. You can change the icon of the application with your icon. Drop your icon into the icon folder. The directory of the icon folder is assets/images/icon.png. Make sure your icon extension or icon type image is PNG. Don’t forget to change your name icon to “icon.png”. For icon push notification, you can change the file image in the android/app/src/main/res/drawable/background.png directory. It’s still the same as icon application, the image type must be PNG, and change the file image’s name to “background.png”.