Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.suppor

异常引起

第一步:看看版本是否一致

该异常:

 

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not download support-annotations.jar (com.android.support:support-annotations:25.4.0)
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:27.0.2.
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方式二：

我在依赖自己公司提供的库的时候出现了unable to resolve dependency for app@......  问题，有可能是网络设置出现问题，我的问题是studio的.gradle文件夹下出现了gradle.properties文本     

路劲在C盘     C:\Users\自己电脑名字文件夹\.gradle     我的：C:\Users\issuser\.gradle

 

此文本对比同事文件夹后发先其他人并没有，里面配置了我的studio的全局设置导致我的网络一直走的代理，所以一直访问不到自己的库。解决方法是

 

注释掉所有内容，然后再设置studio中的设置便能生效。