您可以使用flutter启动器图标：^0.9.2程序包
创建名为 assets 的新文件夹和名为 icon 的子文件夹，然后在pubspec.yaml文件中进行如下更改：

dev_dependencies:
  flutter_launcher_icons: "^0.9.2"

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

这里的图标图像应该是icon.png，它将被存储在路径：资源/图标
现在处于终端运行状态

flutter pub get

有关进一步的信息，请检查this作为参考。这个video可能会有帮助。

在flutter插件的帮助下，您可以更改flutter图标包：
Flutter 启动图标：^0.9.2

• 第一步：

dev_dependencies:
  flutter_launcher_icons: "^0.9.2"

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

• 第二步：

flutter pub get

使用当前方法Flutter启动器图标。
1.编辑 pubspec.yaml 文件：

dev_dependencies:
  flutter_launcher_icons: "^0.10.0"

flutter_icons:
  android: "launcher_icon"
  ios: true
  image_path: "assets/icon/icon.png"
  min_sdk_android: 21 # android min sdk min:16, default 21
  web:
    generate: true
    image_path: "path/to/image.png"
    background_color: "#hexcode"
    theme_color: "#hexcode"
  windows:
    generate: true
    image_path: "path/to/image.png"
    icon_size: 48 # min:48, max:256, default: 48

1.转到终端：

flutter pub get
flutter pub run flutter_launcher_icons:main

祝你愉快...
图片来源：[1]