So thats what I have tried:
I have also found very similar problem from today: Android Studio - Could not find intellij-core.jar yet the only gradle.build file that I found was the one generated with Unity in Temp folder that overwrites itself after every build start.
Unity 2018.2.13f1, Windows 10 x64, Fresh Android Studio 3.2.1, jdk1.8.0_192
Here is a console log:
Short
A problem occurred configuring root project 'gradleOut'. > Could not resolve all files for configuration ':classpath'. > Could not find intellij-core.jar (com.android.tools.external.com-intellij:intellij-core:26.0.1). Searched in the following locations: https://jcenter.bintray.com/com/android/tools/external/com-intellij/intellij-core/26.0.1/intellij-core-26.0.1.jar
Long
CommandInvokationFailure: Gradle build failed. C:\Program Files\Java\jdk1.8.0_192\bin\java.exe -classpath "C:\Program Files (x86)\Unity Editors\2018.2.13f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.2.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleRelease" stderr[ FAILURE: Build failed with an exception. * What went wrong: A problem occurred configuring root project 'gradleOut'. > Could not resolve all files for configuration ':classpath'. > Could not find intellij-core.jar (com.android.tools.external.com-intellij:intellij-core:26.0.1). Searched in the following locations: https://jcenter.bintray.com/com/android/tools/external/com-intellij/intellij-core/26.0.1/intellij-core-26.0.1.jar * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. * Get more help at https://help.gradle.org BUILD FAILED in 1s ] stdout[ ] exit code: 1 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1 progress, System.String error) UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1 progress) Rethrow as GradleInvokationException: Gradle build failed UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1 progress) UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
Here's the only solution that worked for me since I'm behind a proxy.
.gradle folder
(default is under C:\Users\<name>\
).gradle.properties
under this folder.#http proxy setup
systemProp.http.proxyHost=<your proxy URL>
systemProp.http.proxyPort=<your proxy Port>
systemProp.http.nonProxyHosts=*.nonproxyrepos.com|localhost
#https proxy setup
systemProp.https.proxyHost=<your proxy URL>
systemProp.https.proxyPort=<your proxy Port>
systemProp.https.nonProxyHosts=*.nonproxyrepos.com|localhost
Here's what worked for me, as reported here:
Change ONLY THIS:
repositories { jcenter() google() }
to
repositories { google() jcenter() }
Save the file then try the build again. Not a perfect solution but it should work until Unity/Android fixes the issue. I'm not sure whether this can become undone by upgrading Unity, but I do know that it has to be done per project.
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