Since this is a Flutter app, and it generates both Android and iOS projects. You’ll need to change icons in each platform project.

Automatic Way

Flutter Launcher Icons has been designed to help quickly generate launcher icons for both Android and iOS:

1. Flutter Launcher Icon.

2. Add the package to your pubspec.yaml file (within your Flutter project) to use it.

   dev_dependencies:
     flutter_launcher_icons: "0.9.2"
   

3. Within the pubspec.yaml file specify the path of the icon you wish to use for the app and then choose whether you want to use the icon for the iOS app, Android app or both.

   flutter_icons:
     android: true
     ios: true
     image_path: "assets/icon/icon.png"
   

4. After setting up the configuration, all that is left to do is run the package.

   flutter pub get
   flutter pub run flutter_launcher_icons:main
   

The default launcher icons have now been replaced with your custom icon.

Manual method

You can manually replace icons in Android and iOS projects at following places:

• Android: Project_HOME > android > app > src > main > res > drawable
• iOS: Project_HOME > ios > Runner > Assets.xcassets

Keep in mind, in a manual method, you’ll have to generate icons in different resolutions. There’s plenty of tools available that can take your high-res icon and convert them to platform supported resolutions.

Adaptive Icons (Android)

Starting from Android OS 8 api 26, Android has provided adaptive icons option. An adaptive icon, or AdaptiveIconDrawable, can display differently depending on individual device capabilities and user theming.

We also have included a sample adaptive icon in android project. Either you can provide your own adaptive icon or remove those icons.

If you want to add your own adaptive icons:

1. replace these files with your own:

    res / drawable / icon_background.xml
    res / drawable / icon_foreground.xml
   

2. rename the res / mipmap-anydpi-v26 / ic_launcher_rename_if_required.xml to ic_launcher.xml

To provide your own icon as adaptive, you’ll need to design your icon as an svg and then export both the background and foreground layers in separate svg files. Later either convert them to Android vector or import them using android import tool from Android Studio. Importing an SVG or PSD file

If you keep the file name same as above, then nothing more need to be done. Otherwise you’ll need to reference these newly imported files in res / mipmap-anydpi-v26 / ic_launcher.xml as foreground and background of your vector.

If you want to remove adaptive icon

For 1.3.0 and above, nothing needed.

For 1.2.0 and below, remove following files:

res / drawable / icon_background.xml
res / drawable / icon_foreground.xml
res / mipmap-anydpi-v26 / ic_launcher.xml 

If you want to know more about adaptive icons, read more here: Adaptive Icons

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