我用的as的版本是3.4.2，window10系统。
build.gradle文件配置：
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.4.2'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}gradle-wrapper.properties文件：
#Mon Oct 16 10:43:19 CST 2017
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip出现错误：
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve io.reactivex.rxjava2:rxjava:2.1.13.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve io.reactivex.rxjava2:rxandroid:2.0.2.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.squareup.retrofit2:retrofit:2.5.0.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.squareup.retrofit2:converter-gson:2.5.0.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.squareup.retrofit2:adapter-rxjava2:2.4.0.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.jcodecraeer:xrecyclerview:1.3.2.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxjava:2.1.13.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxandroid:2.0.2.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.squareup.retrofit2:retrofit:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.squareup.retrofit2:converter-gson:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.squareup.retrofit2:adapter-rxjava2:2.4.0.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.jcodecraeer:xrecyclerview:1.3.2.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxjava:2.1.13.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxandroid:2.0.2.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:retrofit:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:converter-gson:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:adapter-rxjava2:2.4.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.jcodecraeer:xrecyclerview:1.3.2.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve io.reactivex.rxjava2:rxjava:2.1.13.
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Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve io.reactivex.rxjava2:rxandroid:2.0.2.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.squareup.retrofit2:retrofit:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.squareup.retrofit2:converter-gson:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.squareup.retrofit2:adapter-rxjava2:2.4.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.jcodecraeer:xrecyclerview:1.3.2.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxjava:2.1.13.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve io.reactivex.rxjava2:rxandroid:2.0.2.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:retrofit:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:converter-gson:2.5.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.squareup.retrofit2:adapter-rxjava2:2.4.0.
Show Details
Affected Modules: app
ERROR: Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.jcodecraeer:xrecyclerview:1.3.2.
Show Details
Affected Modules: app
在网上找了很多的解决方法，比如在AS中关掉代理：
结果还是不行。
网上有人说，去掉 gradle.properties 的代理设置，而我的AS的 gradle.properties 没有代理的配置：
后来找到办法了，需要修改 C:\Users\gs\.gradle\gradle.properties 文件，注释掉proxy的设置，如下：
再次build，ok。
总结，是因为我本地的 小飞机 到期了，不能使用了，刚好就出现了这个情况，哎。。。。只想静静的coding，怎么就这么难呢！！！！