Flutter运行卡在Running Gradle task '

1.修改 flutter安装目录/packages/flutter_tools/gradle/resolve_dependencies.gradle 文件

// 大约在19行
repositories {
    google()
    jcenter()
    maven {
        // 修改处
        // url "$storageUrl/download.flutter.io"
        url "http://download.flutter.io"
    }
}

2.修改 flutter/packages/flutter_tools/gradle/flutter.gradle 文件

// 修改处，大约在44行
// private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn/download.flutter.io";