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一，遇到问题

安装环境：安装Android Build Support;【需要将下拉菜单的两项一并安装】

二，分析问题

失败原因：是在下载的对应版本Gradle时，需要访问外网下载速度慢或者网络不稳定导致失败

三，解决问题

方法一：修改配置文件

1，找到Untiy安装目录下的AndroidPlayer\Tools\GradleTemplates文件夹下的 baseProjectTemplate.gradle 文件

参考我的目录：

D:\Program Files\Unity\2019.4.19f1c1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\GradleTemplates

// GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAINallprojects {
       buildscript {
           repositories {
   **ARTIFACTORYREPOSITORY**            google()            jcenter()        }        dependencies {
               // If you are changing the Android Gradle Plugin version, make sure it is compatible with the Gradle version preinstalled with Unity            // See which Gradle version is preinstalled with Unity here https://docs.unity3d.com/Manual/android-gradle-overview.html            // See official Gradle and Android Gradle Plugin compatibility table here https://developer.android.com/studio/releases/gradle-plugin#updating-gradle            // To specify a custom Gradle version in Unity, go do "Preferences > External Tools", uncheck "Gradle Installed with Unity (recommended)" and specify a path to a custom Gradle version            classpath 'com.android.tools.build:gradle:3.4.0'            **BUILD_SCRIPT_DEPS**        }    }    repositories {
   **ARTIFACTORYREPOSITORY**        google()        jcenter()        flatDir {
               dirs "${project(':unityLibrary').projectDir}/libs"        }    }}task clean(type: Delete) {
       delete rootProject.buildDir}

修改为：

// GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAINallprojects {
       buildscript {
           repositories {
   **ARTIFACTORYREPOSITORY**            //google()            //jcenter()           maven{
    url 'http://maven.aliyun.com/repository/google'}                      maven{
    url 'http://maven.aliyun.com/repository/gradle-plugin'}           maven{
    url 'http://maven.aliyun.com/nexus/content/groups/public/'}           maven{
    url 'http://maven.aliyun.com/repository/jcenter'}        }        dependencies {
               // If you are changing the Android Gradle Plugin version, make sure it is compatible with the Gradle version preinstalled with Unity            // See which Gradle version is preinstalled with Unity here https://docs.unity3d.com/Manual/android-gradle-overview.html            // See official Gradle and Android Gradle Plugin compatibility table here https://developer.android.com/studio/releases/gradle-plugin#updating-gradle            // To specify a custom Gradle version in Unity, go do "Preferences > External Tools", uncheck "Gradle Installed with Unity (recommended)" and specify a path to a custom Gradle version            classpath 'com.android.tools.build:gradle:3.4.0'            **BUILD_SCRIPT_DEPS**        }    }    repositories {
   **ARTIFACTORYREPOSITORY**        //google()        //jcenter()        maven{
    url 'http://maven.aliyun.com/repository/google'}                   maven{
    url 'http://maven.aliyun.com/repository/gradle-plugin'}        maven{
    url 'http://maven.aliyun.com/nexus/content/groups/public/'}        maven{
    url 'http://maven.aliyun.com/repository/jcenter'}        flatDir {
               dirs "${project(':unityLibrary').projectDir}/libs"        }    }}task clean(type: Delete) {
       delete rootProject.buildDir}

然后重新打包即可。

方法二：修改Preferences属性

在官网上提前下载好需要版本gradle：

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