Java 禁用脱机模式并重新运行生成

已检查并应用这些答案：-

禁用脱机模式

从菜单栏查看>工具窗口>渐变

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然后，在Gradle窗口顶部附近，单击Gradle面板中的切换脱机模式Gradle Offline按钮。

只需尝试文件->使缓存无效/重新启动尝试先删除项目下的.idea和.Gradle文件，然后重新打开项目。@dk已经这样做了，但是没有luck@Anna也这么做了，但是没有幸运的是你正在使用离线版本的android studio，这就是为什么它显示了这个错误。将wifi连接到你的计算机，关闭android studio，然后再次打开它，然后发布你的gradle.build文件

A problem occurred configuring root project 'customerapp'.
> Could not resolve all artifacts for configuration ':classpath'.  
   > Could not resolve com.android.tools.build:gradle:4.1.3.  
     Required by:  
         project :  
      > No cached version of com.android.tools.build:gradle:4.1.3 available for offline mode.  
      > No cached version of com.android.tools.build:gradle:4.1.3 available for offline mode.  
   > Could not resolve com.google.gms:google-services:4.3.5.  
     Required by:  
         project :  
      > No cached version of com.google.gms:google-services:4.3.5 available for offline mode.  
      > No cached version of com.google.gms:google-services:4.3.5 available for offline mode.  
   > Could not resolve com.android.tools.build:gradle:4.1.3.  
     Required by:  
         project : > com.jakewharton:butterknife-gradle-plugin:9.0.0-rc2  
      > No cached version of com.android.tools.build:gradle:4.1.3 available for offline mode.  
      > No cached version of com.android.tools.build:gradle:4.1.3 available for offline mode.  
   > Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71.  
     Required by:  
         project : > com.jakewharton:butterknife-gradle-plugin:9.0.0-rc2  
      > No cached version of org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71 available for offline mode.  
      > No cached version of org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71 available for offline mode.  
   > Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71.  
     Required by:  
         project : > io.realm:realm-gradle-plugin:7.0.0 > io.realm:realm-transformer:7.0.0  
      > No cached version of org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71 available for offline mode.  
      > No cached version of org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.2.71 available for offline mode.  

Possible solution:
 - Disable offline mode and rerun the build