Flutter: Error running Gradle

Error running Gradle 錯誤

這個錯誤是在重裝環境後出現的，重裝並創建第一個項目後flutter run的時候爆出了這個錯，* Error running Gradle:

ProcessException: Process "xxx/first_flutter_app/android/gradlew" exited abnormally:
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 'xxx/first_flutter_app/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 0s
  Command: xxx/first_flutter_app/android/gradlew app:properties

Finished with error: Please review your Gradle project setup in the android/ folder.

從這裏面當時並沒看出來是什麼問題，但可以確定gradle出的問題，後來網上查了下發現是下載文件時候需要翻牆，否則有些文件就下載不了出現了這個問題。
解決辦法有兩個

1. 第一個是翻牆這肯定是不方便的。
2. 第二個解決辦法就是使用阿里雲的鏡像文件。

下面介紹第二種解決辦法，首先找到Android中的gradle文件，將代碼改爲下面格式

buildscript {
    repositories {
//        google()
//        jcenter()
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
    }
}

allprojects {
    repositories {
//        google()
//        jcenter()
        maven { url 'https://maven.aliyun.com/repository/google' }
        maven { url 'https://maven.aliyun.com/repository/jcenter' }
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
    }
}

第二步就是修改flutter sdk中的flutter.gradle文件，具體路徑爲fluttersdk目錄▸ ⁨packages⁩ ▸ ⁨flutter_tools⁩ ▸ ⁨gradle 這個文件的修改有兩種類型
第一種：

repositories{

google()

gcenter()

}

這種就按下面方式修改

repositories{

//google()
//gcenter()

maven { url 'https://maven.aliyun.com/repository/google' }
maven { url 'https://maven.aliyun.com/repository/jcenter' }
maven { url'http://maven.aliyun.com/nexus/content/groups/public'}
}

還有一種情況

repositories {
        jcenter()
        maven {
            url 'https://dl.google.com/dl/android/maven2'
        }

    

這種就按下面方式修改

repositories {
        //jcenter()
        // maven {
        //     url 'https://dl.google.com/dl/android/maven2'
        // }
        maven{
            url 'https://maven.aliyun.com/repository/jcenter'
        }
        maven{
            url 'http://maven.aliyun.com/nexus/content/groups/public'
        }
    }

這樣就可以解決這個問題了