覆盖Android三方库的仓库地址

问题场景

flutter中使用了一个定位权限库location_permissions，运行发现报以下错误。

* What went wrong:
A problem occurred configuring project ':location_permissions'.
> Could not resolve all artifacts for configuration ':location_permissions:classpath'.
   > Could not resolve org.ow2.asm:asm-util:6.0.
     Required by:
         project :location_permissions > com.android.tools.build:gradle:3.5.0
         project :location_permissions > com.android.tools.build:gradle:3.5.0 > com.android.tools.build:builder:3.5.0
         project :location_permissions > com.android.tools.build:gradle:3.5.0 > com.android.tools.build.jetifier:jetifier-processor:1.0.0-beta04
      > Could not resolve org.ow2.asm:asm-util:6.0.
         > Could not get resource 'https://jcenter.bintray.com/org/ow2/asm/asm-util/6.0/asm-util-6.0.pom'.
            > Could not HEAD 'https://jcenter.bintray.com/org/ow2/asm/asm-util/6.0/asm-util-6.0.pom'.
               > The server may not support the client's requested TLS protocol versions: (TLSv1.2, TLSv1.3). You may need to configure the client to allow other protocols to be used. See: https://docs.gradle.org/7.2/userguide/build_environment.html#gradle_system_properties
                  > Remote host terminated the handshake
> Failed to notify project evaluation listener.
   > Could not get unknown property 'android' for project ':location_permissions' of type org.gradle.api.Project.
   > Could not get unknown property 'android' for project ':location_permissions' of type org.gradle.api.Project.
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问题分析

根据错误提示，是这个库依赖了其他三方库，从jcenter仓库下载失败了。
但是已经在android中替换了默认的jcenter仓库和maven仓库，为什么还会从jcenter下载呢。

我们打开的location_permissions的Github仓库，打开android目录下的build.gradle

看到这里就明白了，原来插件的android配置使用了jencter仓库，所以和插件有关的依赖都会从jencter里面下载。

解决方案

接下来我们来覆盖掉三方库中的repositories引用。
打开settings.gradle.
添加以下内容

dependencyResolutionManagement {
  repositories {
        maven {
            url 'https://maven.aliyun.com/repository/public/'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/gradle-plugin'
        }
  }
  repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
}
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打开项目根目录的build.gradle

buildscript {
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/public/'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/gradle-plugin'
        }
    }
	......
}

allprojects {
    buildscript {
	    repositories {
	        maven {
	            url 'https://maven.aliyun.com/repository/public/'
	        }
	        maven {
	            url 'https://maven.aliyun.com/repository/google'
	        }
	        maven {
	            url 'https://maven.aliyun.com/repository/gradle-plugin'
	        }
	    }
	}
    repositories {
        maven {
            url 'https://maven.aliyun.com/repository/public/'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/gradle-plugin'
        }
    }
}
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再次运行，三方库中的依赖就能正常下载了，不会报下载失败的错误。

替换flutter sdk的repository

问题场景

再次运行，还是发现以下错误

* Where:
Build file '/Users/ado/Developer/project/x_creator/android/app/build.gradle' line: 33

* What went wrong:
A problem occurred evaluating project ':app'.
> Could not resolve all artifacts for configuration 'classpath'.
   > Could not resolve com.google.flatbuffers:flatbuffers-java:1.12.0.
     Required by:
         unspecified:unspecified:unspecified > com.android.tools.build:gradle:4.1.0
      > Could not resolve com.google.flatbuffers:flatbuffers-java:1.12.0.
         > Could not get resource 'https://repo.maven.apache.org/maven2/com/google/flatbuffers/flatbuffers-java/1.12.0/flatbuffers-java-1.12.0.pom'.
            > Could not HEAD 'https://repo.maven.apache.org/maven2/com/google/flatbuffers/flatbuffers-java/1.12.0/flatbuffers-java-1.12.0.pom'.
               > The server may not support the client's requested TLS protocol versions: (TLSv1.2, TLSv1.3). You may need to configure the client to allow other protocols to be used. See: https://docs.gradle.org/7.2/userguide/build_environment.html#gradle_system_properties
                  > Remote host terminated the handshake
   > Could not resolve org.tensorflow:tensorflow-lite-metadata:0.1.0-rc1.
     Required by:
         unspecified:unspecified:unspecified > com.android.tools.build:gradle:4.1.0
      > Could not resolve org.tensorflow:tensorflow-lite-metadata:0.1.0-rc1.
         > Could not get resource 'https://repo.maven.apache.org/maven2/org/tensorflow/tensorflow-lite-metadata/0.1.0-rc1/tensorflow-lite-metadata-0.1.0-rc1.pom'.
            > Could not GET 'https://repo.maven.apache.org/maven2/org/tensorflow/tensorflow-lite-metadata/0.1.0-rc1/tensorflow-lite-metadata-0.1.0-rc1.pom'.
               > The server may not support the client's requested TLS protocol versions: (TLSv1.2, TLSv1.3). You may need to configure the client to allow other protocols to be used. See: https://docs.gradle.org/7.2/userguide/build_environment.html#gradle_system_properties
                  > Remote host terminated the handshake

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问题分析

根据错误提示，找到app/build.gradle，在第33行发现以下引用。
Android端run或者compile时，会调用flutter sdk中的gradle仓库配置去下载对应的依赖。

然后我们根据这个地址去flutter sdk的对应目录下的flutter.gradle，发现了以下仓库配置。刚好对应了上面报错信息中的gradle版本号4.1.0。

解决方案

我们只需要把google和mavenCentral()换成国内的仓库镜像即可。

buildscript {
    repositories {
        //google()
        //mavenCentral()
        maven {
            url 'https://maven.aliyun.com/repository/public/'
        }
        maven {
            url 'https://maven.aliyun.com/repository/google'
        }
        maven {
            url 'https://maven.aliyun.com/repository/gradle-plugin'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}
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参考：Cannot override Gradle repositories in transitive plugin dependencies