为什么在 flutter 项目中添加启动器图标时出现错误？

Question

因此，我正在尝试用我的图标更改默认的颤动启动器图标。我正在使用flutter_launcher_icons: ^0.9.2pub.dev 。 \npubspec.yaml 中的代码：

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dependencies:\n  flutter:\n    sdk: flutter\n\n\n  # The following adds the Cupertino Icons font to your application.\n  # Use with the CupertinoIcons class for iOS style icons.\n  cupertino_icons: ^1.0.2\n  hexcolor: ^2.0.5\n  google_fonts: ^2.1.0\n  flutter_neumorphic: ^3.2.0\n  flutter_launcher_icons: ^0.9.2\n\ndev_dependencies:\n  flutter_lints: ^1.0.4\n  flutter_test:\n    sdk: flutter\n\nflutter_icons:\n  image_path: "assets/icon/icon.png"\n  android: true\n  ios: true\n

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但是当我运行时flutter pub run flutter_launcher_icons:main，我收到错误消息：

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  \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\n     FLUTTER LAUNCHER ICONS (v0.9.1)\n  \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\n\n\n\xe2\x9c\x93 Successfully generated launcher icons\nUnhandled exception:\nFormatException: Invalid number (at character 1)\n\n^\n\n#0      int._handleFormatError (dart:core-patch/integers_patch.dart:129:7)\n#1      int.parse (dart:core-patch/integers_patch.dart:55:14)\n#2      minSdk (package:flutter_launcher_icons/android.dart:309:18)\n#3      createIconsFromConfig (package:flutter_launcher_icons/main.dart:94:47)\n#4      createIconsFromArguments (package:flutter_launcher_icons/main.dart:60:7)\n#5      main (file:///C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_launcher_icons-0.9.2/bin/main.dart:6:26)\n#6      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:32)\n#7      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)\npub finished with exit code 255\n

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并且图标不会改变。

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大概是什么问题？

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=>我的意思是，因为它以前工作过很多次......

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Answer 1

转至 并将和android/app/build.gradle更改为整数值。minSdkVersiontargetSdkVersion

minSdkVersion 21
targetSdkVersion 29
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName

然后做剩下的事情，即

pub.get -> flutter pub run flutter_launcher_icons:main

Answer 2

另一种解决问题的方法也对我有用。

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关于

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这个错误主要是由于android: true，当我在遵循许多文章后尝试使用

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（pubspec.yaml）

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flutter_icons:\n  image_path: "images/icon.png" \n  android: false\n  ios: true\n

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它只适用于ios，之后我得到了一个用于ios的推荐代码。我补充道。

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flutter_icons:\n  image_path: "images/icon.png" \n  android: false\n  ios: true\n  remove_alpha_ios: true  //recommendation added\n

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最后一步

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（选修的）

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错误是我造成的

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只需检查您是否在同一个文件中编写了任何额外的代码，因为由于文件中的额外代码，我遇到了很多麻烦。这一build.gradle行用于flutter.minSdkVersion从android\\local.properties文件中获取 的值。

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def flutterminSdkVersion = localProperties.getProperty(\'flutter.minSdkVersion\')\n

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(android\\app\\build.gradle)

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    minSdkVersion 16 \n    targetSdkVersion flutter.targetSdkVersion\n    versionCode flutterVersionCode.toInteger()\n    versionName flutterVersionName\n

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然后运行通常的代码

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flutter pub get \nflutter pub run flutter_launcher_icons:main\n

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我得到了输出

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 \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\n     FLUTTER LAUNCHER ICONS (v0.9.1)\n  \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\n\n\xe2\x80\xa2 Creating default icons Android\n\xe2\x80\xa2 Overwriting the default Android launcher icon with a new icon\n\xe2\x80\xa2 Overwriting default iOS launcher icon with new icon\n\n\xe2\x9c\x93 Successfully generated launcher icons\n

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最终上述代码解决了问题，我希望任何人都可以从中获得帮助并节省他/她的宝贵时间。

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附上一些资料来源，这对我做出最终判决有帮助。

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https://issueexplorer.com/issue/fluttercommunity/flutter_launcher_icons/301 \n https://github.com/fluttercommunity/flutter_launcher_icons/issues/88

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Answer 3

我遇到了同样的问题并找到了解决方案

1.添加依赖项如下[pubspec.yaml]

dependencies:
  flutter:
    sdk: flutter
  flutter_launcher_icons: ^0.9.2  // add lib as here

2. 添加以下行[pubspec.yaml]

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

3.打开local.properties文件并添加以下行[android\local.properties]

flutter.minSdkVersion=21

4.现在转到app/build.gradle文件并添加以下内容（如果不存在）： [app level > build.gradle]

def flutterMinSdkVersion = localProperties.getProperty('flutter.minSdkVersion')
if (flutterMinSdkVersion == null) {
    flutterMinSdkVersion = flutter.minSdkVersion.toString()
}

defaultConfig5.然后转到build.gradle[转到下面的同一文件]

替换这一行> minSdkVersion flutter.minSdkVersion

与此>minSdkVersion flutterMinSdkVersion

6. 转到build.gradle并保存

7. 转到local.properties并保存

8.进入android studio并运行下面

flutter pub get 
    
flutter pub run flutter_launcher_icons:main

它会起作用的:)！