Flutter 安装 Gradle 问题

Question

我正在尝试使用 Flutter 运行一个基本的 hello world 项目。这些是我在运行 Window 10 Pro 的 Windows 机器上安装 Flutter 所采取的步骤。

1. 下载flutter_windows_v0.9.4-beta.zip并解压到c:\src\

2. 将位置添加到环境设置...C:\src\flutter

3. 下载并安装 Android Studio 并使用 ADV Manager 设置模拟器。

4. 已下载并安装 Visual Studio Code

5. 添加了 Dart 2.19.0 扩展

6. 添加了 Flutter 2.19.0 扩展

7. 运行 Flutter 医生

    [flutter] flutter doctor
    Doctor summary (to see all details, run flutter doctor -v):
    [√] Flutter (Channel beta, v0.9.4, on Microsoft Windows [Version 10.0.15063], locale en-GB)
    [√] Android toolchain - develop for Android devices (Android SDK 28.0.3)
    [√] Android Studio (version 3.2)
        X Flutter plugin not installed; this adds Flutter specific functionality.
        X Dart plugin not installed; this adds Dart specific functionality.
    [√] VS Code (version 1.28.2)
    [√] Connected devices (1 available)

8. 新建一个flutter项目

9. Test文件夹下的已删除代码

10. 将main.dart 中的代码替换为...

    import 'package:flutter/material.dart';
    
    void main() {
      runApp(Center(
        child: Text(
          "this is a test",
          textDirection: TextDirection.ltr,
        ),
      ));
    }

11. 运行项目并得到以下错误...

    Launching lib\main.dart on Android SDK built for x86 in debug mode...
    * Error running Gradle:
    Exit code 1 from: C:\Users\to0589\Desktop\flutter projects\asad\android\gradlew.bat app:properties:
    Project evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.
    
    
    FAILURE: Build failed with an exception.
    
    * Where:
    Build file 'C:\Users\to0589\Desktop\flutter projects\asad\android\app\build.gradle' line: 25
    
    * What went wrong:
    A problem occurred evaluating project ':app'.
    > Could not resolve all files for configuration 'classpath'.
       > Could not find lint-gradle-api.jar (com.android.tools.lint:lint-gradle-api:26.1.2).
         Searched in the following locations:
             https://jcenter.bintray.com/com/android/tools/lint/lint-gradle-api/26.1.2/lint-gradle-api-26.1.2.jar
    
    * Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
    
    * Get more help at https://help.gradle.org
    
    BUILD FAILED in 1s
    Please review your Gradle project setup in the android/ folder.
    Exited (sigterm)

谁能告诉我哪里出了问题，非常感谢任何帮助。

Answer 1

这不是您的安装问题。这是目前 Flutter 版本很多人都面临的问题。

它是already fixed。但是，它还没有发布到最稳定的版本。

如果你把flutter channel改成master，你会看到它会正常运行。

您现在可以使用主频道，然后将其切换回dev。

flutter channel master
flutter upgrade

# to see all the channels, run
flutter channel

Answer 2

https://github.com/flutter/flutter/pull/23397

简而言之，按照上面链接中的Mahi-K，您必须编辑$flutterRoot/packages/flutter_tools/gradle/flutter.gradle

buildscript {
    repositories {
        google()
        jcenter()
        maven {
            url 'https://dl.google.com/dl/android/maven2'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
    }
}

在 gradle 包装器属性 gradle/wrapper/gradle-wrapper.properties 中，您可能还需要将其更改为 4.6 或更高版本

distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

Answer 3

在你的电脑中打开flutter根文件夹，然后打开那个根文件夹中的gradle文件夹（例如C:\flutter\package\flutter_tool\gradle）并添加'google()'到构建脚本。它为我解决了这个问题。

颤振根文件夹：

在构建脚本中添加“google()”：

Answer 4

通过更改本节中的类路径来更新 Flutter 或使用以前版本的 gradle。

buildscript {
  repositories {
    google()
    jcenter()
    maven {
        url 'https://dl.google.com/dl/android/maven2'
    }
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.2.1'
}}