1- Create your application iconic_launcher
Files After creating the symbols file, replace the following files:
/mipmap-hdpi
in /android/app/src/main/res/
folder
/mipmap-mdpi
in /android/app/src/main/res/
folder
/mipmap-xhdpi
in /android/app/src/main/res/
folder
/mipmap-xxhdpi
in /android/app/src/main/res/
folder
/mipmap-xxxhdpi
in /android/app/src/main/res/
folder
Note:The application icon must be renamed ic_launcher