遵循以下步骤:-

1. 在pubspec中添加flutter_luncher_icons的依赖项。yaml文件。你可以在这里找到这个插件。

2. 在资产文件夹和pubspec中添加所需的图像。Yaml文件如下。

pubspec.yaml

name: NewsApi.org
description: A new Flutter application.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
      sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.1
  fluttertoast: ^7.1.6
  toast: ^0.1.5
  flutter_launcher_icons: ^0.8.0




dev_dependencies:
  flutter_test:
    sdk: flutter

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

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true
  assets:
    - assets/images/dropbox.png



  fonts:
    - family: LangerReguler
      fonts:
        - asset: assets/langer_reguler.ttf




  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

3.执行terminal flutter pub get命令，然后执行flutter_luncher_icon命令。这是成功运行命令后得到的结果。并成功生成了午餐图标。

我的终端

[E:\AndroidStudioProjects\FlutterProject\NewsFlutter\news_flutter>flutter pub get
Running "flutter pub get" in news_flutter...                       881ms

E:\AndroidStudioProjects\FlutterProject\NewsFlutter\news_flutter>flutter pub run flutter_launcher_icons:main
  ════════════════════════════════════════════
     FLUTTER LAUNCHER ICONS (v0.8.0)
  ════════════════════════════════════════════

• Creating default icons Android
• Overwriting the default Android launcher icon with a new icon

✓ Successfully generated launcher icons

遵循以下步骤:-

1. 在pubspec中添加flutter_luncher_icons的依赖项。yaml文件。你可以在这里找到这个插件。

2. 在资产文件夹和pubspec中添加所需的图像。Yaml文件如下。

pubspec.yaml

name: NewsApi.org
description: A new Flutter application.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
      sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.1
  fluttertoast: ^7.1.6
  toast: ^0.1.5
  flutter_launcher_icons: ^0.8.0




dev_dependencies:
  flutter_test:
    sdk: flutter

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

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true
  assets:
    - assets/images/dropbox.png



  fonts:
    - family: LangerReguler
      fonts:
        - asset: assets/langer_reguler.ttf




  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

3.执行terminal flutter pub get命令，然后执行flutter_luncher_icon命令。这是成功运行命令后得到的结果。并成功生成了午餐图标。

我的终端

[E:\AndroidStudioProjects\FlutterProject\NewsFlutter\news_flutter>flutter pub get
Running "flutter pub get" in news_flutter...                       881ms

E:\AndroidStudioProjects\FlutterProject\NewsFlutter\news_flutter>flutter pub run flutter_launcher_icons:main
  ════════════════════════════════════════════
     FLUTTER LAUNCHER ICONS (v0.8.0)
  ════════════════════════════════════════════

• Creating default icons Android
• Overwriting the default Android launcher icon with a new icon

✓ Successfully generated launcher icons

Flutter Launcher Icons已设计用于帮助快速生成Android和iOS的启动器图标:https://pub.dartlang.org/packages/flutter_launcher_icons

将包添加到您的pubspec中。yaml文件(在Flutter项目中)来使用它 pubspec之内。yaml文件指定图标的路径，你希望使用的应用程序，然后选择是否要使用图标的iOS应用程序，Android应用程序或两者。 运行包 瞧!默认的启动器图标现在已经替换为您的自定义图标

我希望在GitHub README中添加一个视频来演示它

演示如何运行该工具的视频可以在这里找到。

如果有人想提出改进建议/报告错误，请将其作为一个问题添加到GitHub项目中。

更新:截至2018年1月24日星期三，您应该能够创建新的图标，而不覆盖颤振项目中旧的现有启动器图标。

更新2:从v0.4.0(2018年6月8日)开始，你可以为Android图标指定一个图像，为iOS图标指定一个单独的图像。

更新3:截至v0.5.2(2018年6月20日)，您现在可以为您的Flutter项目的Android应用程序添加自适应启动器图标

我按照以下步骤进行了修改:

1)请在您的pubspec中添加此依赖项。yaml页面

 dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_launcher_icons: ^0.7.4

2)你必须在你的项目上上传一个你想要作为启动器图标的图像/图标。(我已经在我的项目中创建了一个文件夹名称:image，然后在image文件夹中上传logo.png)。现在您必须添加以下代码并将图像路径粘贴到pubspec中的image_path:上。yaml的页面。

flutter_icons:
  image_path: "images/logo.png"
  android: true
  ios: true

3)进入终端执行如下命令:

flutter pub get

4)执行命令后输入以下命令:

flutter pub run flutter_launcher_icons:main

5)完成

注意:(当然从。添加一个更新的依赖项。

https://pub.dev/packages/flutter_launcher_icons#-installing-tab-

)

最好的方法是分别改变iOS和Android的启动器图标。

分别修改iOS和Android模块的图标。 该插件从相同的图标产生不同大小的图标，这些图标是扭曲的。

点击这个链接: https://flutter.dev/docs/deployment/android

我建议你使用下面链接的这个网站

应用图标创造者

步骤1:上传图片

步骤2:做必要的修改，然后点击下载(不要更改文件名)

步骤3:解压下载的Zip文件在相应的文件夹

android/app/src/main/res