问题1
场景：
Error:A problem occurred configuring root project '项目名'.
> Could not resolve all dependencies for configuration ':classpath'.
> Timeout waiting to lock artifact cache (/Users/Skyf/.gradle/caches/modules-2). It is currently in use by another Gradle instance.
Owner PID: 10747
Our PID: 10791
Owner Operation:
Our operation:
Lock file: /Users/Skyf/.gradle/caches/modules-2/modules-2.lock
解决：
删除项目中的.gradle文件夹 再次编译
问题2
场景：
Error:A problem occurred configuring project ':app'.（和1不一样，这边指的是主app）
> Could not resolve all dependencies for configuration ':app:_debugApk'.
> Timeout waiting to lock artifact cache (/Users/Skyf/.gradle/caches/modules-2). It is currently in use by another Gradle instance.
Owner PID: 10747
Our PID: 10791
Owner Operation:
Our operation:
Lock file: /Users/Skyf/.gradle/caches/modules-2/modules-2.lock
解决：
删除主app里的build，再重新编译一次，之后出现了 method ID not in [0, 0xffff]: 65536 的错误，老问题，闭着眼睛处理掉。
问题3
场景：
各种不能用： 可以查看一下详情，一般原因都写都很清楚，我这边是因为端口号没有配置好的网络问题
/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobTools:+.
<a href="openFile:/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle">Open File</a><br><a href="Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobTools:+.">Show Details</a>
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobCommons:+.
<a href="openFile:/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle">Open File</a><br><a href="Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobCommons:+.">Show Details</a>
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobGUI:+.
<a href="openFile:/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle">Open File</a><br><a href="Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:MobGUI:+.">Show Details</a>
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:SDKWrapper:+.
<a href="openFile:/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle">Open File</a><br><a href="Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.mob:SDKWrapper:+.">Show Details</a>
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve cn.sharesdk:ShareSDK:+.
<a href="openFile:/Users/Skyf/Documents/Android Project/hotspot/app/build.gradle">Open File</a><br><a href="Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve cn.sharesdk:ShareSDK:+.">Show Details</a>
解决：
因网络原因引起的可以试试这些方法：
方法1:FQ
方法2:Go to `File->Settings->Build, Execution, Deployment->Gradle->Uncheck Offline work option.`
方法3:打开gradle.properties ——> 注释掉端口号的设置 项 systemProp.http.proxyPort=10895