I have the same problem. There is a workaround ?

Same problem here.

My current workaround is to build the .aar file manually with gomobile bind, then import .aar module into the Android Studio project (New/New Module/Import .jar/.aar). In other words, I do not use the plugin at all, just manually import the .aar module into the project, and make the project dependent on it.

You can test it with bind/hello example. Delete the "hello" folder with its gradle file from the android project first, then build the hello.aar manually, in the original location of the hello.go package, import the .aar into the Android Studio project, and make the project dependent on the newly added module.

After a bunch of blind poking and prodding in GobindPlugin.groovy, I have something that works. I don't know if it's the right way to fix this bug, but I am able to sync and build my project again.

Specifically, I moved the 'clean task':

    Task cleanTask = project.tasks.create("clean", {
        project.delete(project.name+".aar")
    })

from the GobindPlugin.apply method to BindTask.run method.

To anyone who is more knowledgeable about Gradle plugins, is this is a reasonable way to fix the issue?

Here's a diff for reference:

--- ./agent/external-deps/src/golang.org/x/mobile/misc/androidstudio/src/main/groovy/org/golang/mobile/GobindPlugin.groovy      2017-10-30 14:09:08.182858589 -0700
+++ ./buildSrc/src/main/groovy/org/golang/mobile/GobindPlugin.groovy    2018-02-23 14:47:11.943655069 -0800
@@ -66,9 +66,11 @@
                        null,
                        gomobileTask))
 
+        /*
                Task cleanTask = project.tasks.create("clean", {
                        project.delete(project.name+".aar")
                })
+        */
        }
 
        private static void handleVariant(Project project, def variant) {
@@ -137,7 +139,9 @@
                        // fallback to ANDROID_HOME
                        androidHome = System.getenv("ANDROID_HOME")
                }

+        Task cleanTask = project.tasks.create("clean", {
+            project.delete(project.name+".aar")
+        })
                project.exec {
                        executable(exe)

Any updates?

Tips for manual installation with android studio 3.0

Change https://golang.org/cl/112455 mentions this issue: misc/androidstudio: drop the clean task to fix Android Studio gradle sync

The CL should fix the issue. Note that only gradle sync fails; running a gomobile project from Android Studio does work.