卡在Running Gradle task ‘assembleTgRelease’.很久的解决方案

原因：Gradle的Maven仓库在国外，速度较慢或访问超时。

解决方案：设置淘宝镜像

1、修改flutter项目，android目录下的build.gradle

buildscript {
ext.kotlin_version = '1.3.50'
repositories {
//google()
//mavenCentral()
maven { url 'https://maven.aliyun.com/repository/google' }
maven { url 'https://maven.aliyun.com/repository/jcenter' }
maven { url 'https://maven.aliyun.com/nexus/content/groups/public' }
}

dependencies {
classpath 'com.android.tools.build:gradle:4.1.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
//google()
//mavenCentral()
maven { url 'https://maven.aliyun.com/repository/google' }
maven { url 'https://maven.aliyun.com/repository/jcenter' }
maven { url 'https://maven.aliyun.com/nexus/content/groups/public' }
}
}

2、修改flutter安装目录下在的flutter.gradle

文件位置：flutter安装路径\flutter\packages\flutter_tools\gradle\flutter.gradle

buildscript {
repositories {
// google()
// mavenCentral()
 maven { url 'https://maven.aliyun.com/repository/google' }
 maven { url 'https://maven.aliyun.com/repository/jcenter' }
 maven { url 'https://maven.aliyun.com/nexus/content/groups/public' }
}
dependencies {
classpath 'com.android.tools.build:gradle:4.1.0'
}
}
private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
//修改为
private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn";

好了，现在再操作就会快很多。