flutter_launcher_icons.yaml

flutter_icons:
  #   The default icon to use for all platforms.
  icon_path: 'icons/icon.png'

  #   === Android configuration ===
  min_sdk_android: 21
  #   The name of the generated Android icon resource.
  #   Leaving this as 'ic_launcher' is fine in most cases.
  android: 'ic_launcher'
  #   Default image for Android icons.
  image_path_android: 'icons/icon_alpha.png'
  #   Adaptive icon background can be either an image path
  #   or a hex color.
  #   Adaptive icon foreground should have a transparent background.
  adaptive_icon_background: '#FFFFFF'
  adaptive_icon_foreground: 'icons/icon_alpha.png'

  #   === iOS configuration ===
  ios: true
  #   Default image for ios icons.
  #   Should NOT have transparency.
  image_path_ios: 'icons/icon.png'

  #   === Web configuration ===
  web:
    generate: true
    image_path: 'icons/icon.png'
    background_color: '#FFFFFF'
    theme_color: '#E4000F'