Flutter下载jar速度慢

文章转自：https://blog.csdn.net/qq_34777982/article/details/108810701

用Android Stduio创建Flutter项目的时候，会出现各种问题，踩了一个又一个，最后编译的时候可能会出现一直显示Running Gradle task 'assembleDebug'然后就不动了，或者会显示Could not resolve io.flutter等问题，归根结底是网络无法访问到Google服务引起的，两种解决方案：

1.具有比较良好的访问谷歌的网络环境

2.修改镜像源为国内的：

找到Flutte SDK目录下的Flutter打包配置文件flutter.gradle

路径为flutter\packages\flutter_tools\gradle\flutter.gradle

第一处配置：
buildscript {
repositories {
//注释
// google()
// jcenter()
//添加
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:3.5.0'
}
}

第二处配置：
class FlutterPlugin implements Plugin<Project> {
//注释
// private static final String MAVEN_REPO = "https://storage.googleapis.com/download.flutter.io";
//添加这行
private static final String MAVEN_REPO = "https://storage.flutter-io.cn/download.flutter.io";

// The platforms that can be passed to the `--Ptarget-platform` flag.
private static final String PLATFORM_ARM32  = "android-arm";
private static final String PLATFORM_ARM64  = "android-arm64";
private static final String PLATFORM_X86    = "android-x86";
private static final String PLATFORM_X86_64 = "android-x64";

// The ABI architectures.
private static final String ARCH_ARM32      = "armeabi-v7a";
private static final String ARCH_ARM64      = "arm64-v8a";
private static final String ARCH_X86        = "x86";
private static final String ARCH_X86_64     = "x86_64";

第三处配置：
void addFlutterDependencies(buildType) {
String flutterBuildMode = buildModeFor(buildType)
if (!supportsBuildMode(flutterBuildMode)) {
return
}
String repository = useLocalEngine()
? project.property('local-engine-repo')
: MAVEN_REPO

    project.rootProject.allprojects {
        repositories {
            maven {
                url repository
            }
           //添加
            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' }
        }
    }

最后一处，项目中的配置，修改Flutter项目下的android下的build.gradle：
buildscript {
ext.kotlin_version = '1.3.50'
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:3.5.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}

}

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' }
}
}
修改完成后，再build，就可以正常构建了！！！