初學(xué)Flutter，按照官網(wǎng)提示搭建完環(huán)境，新建一個(gè)first_flutter_app, 開開信心的Run，然后報(bào)錯(cuò)了：

Error running Gradle

* 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.

看到這個(gè)錯(cuò)誤 一臉蒙蔽，都是按照操作來走的，沒啥問題，不過可以定位到 肯定是gradle那里出問題。網(wǎng)上搜了下，發(fā)現(xiàn)項(xiàng)目的gradle 文件里面：

buildscript {
    repositories {
      // 需要翻墻下載
        google()
        jcenter()
    }

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

allprojects {
    repositories {
    // 需要翻墻下載
        google()
        jcenter()
    }
}

下載某些文件是需要翻墻才可以下載，所以我們?cè)谶\(yùn)行的時(shí)候會(huì)報(bào)錯(cuò)。修改如下：

用阿里云的鏡像文件 解決無法翻墻下載的問題

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' }
    }
}

這時(shí)候你以為修改完了嗎？ 沒有還需要修改Flutter 下邊的 gradle文件，
打開Flutter sdk目錄，找到如下地址：

 flutter? ? ?packages? ? ?flutter_tools? ? ?gradle

打開 flutter.gradle 文件

buildscript {
    repositories {
        //注視掉原有的，采用鏡像地址下載
        // 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'
    }
}

這個(gè)時(shí)候在運(yùn)行項(xiàng)目，可以正確運(yùn)行了。