Android Studio: R.jar: The process cannot access the file because it is being used by another process

user_12498176 0
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After a new installation of Android Studio 3.6.3 (portable). When I try to build and run my project, I keep getting

app\build\intermediates\compile_and_runtime_not_namespaced_r_class_jar\debug\R.jar: The process cannot access the file because it is being used by another process.

Not sure what it wants from me. I run Android Studio "as administrator" and even closing the project and reopening it, the first time it runs, the second time I get the error.

I tried invalidate caches and restart, I tried deleting folders under app/build but it seems to come back. What am I missing?

Thanks

Update:

When trying to clean the project, I get the following

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:clean'.
> Unable to delete directory 'C:\Users\name\Downloads\portable\android-studio\projects\appm\app\build'
    Failed to delete some children. This might happen because a process has files open or has its working directory set in the target directory.
    - C:\Users\name\Downloads\portable\android-studio\projects\appm\app\build\intermediates\compile_and_runtime_not_namespaced_r_class_jar\debug\R.jar
    - C:\Users\name\Downloads\portable\android-studio\projects\appm\app\build\intermediates\compile_and_runtime_not_namespaced_r_class_jar\debug
    - C:\Users\name\Downloads\portable\android-studio\projects\appm\app\build\intermediates\compile_and_runtime_not_namespaced_r_class_jar
    - C:\Users\name\Downloads\portable\android-studio\projects\appm\app\build\intermediates

If I wait for several minutes, for example, the time it took me to update this question, then it works again...

update: Updated to Android Studio 4 and the same problem occurs.

android-studio build.gradle android
6 Answers

Try

taskkill /im java.exe /f

in cmd (windows 10)

user_41621160

I encountered the same problem but on Android Studio Arctic Fox while working on a Jet Compose project.

I simply changed the run configuration and the build error was resolved. enter image description here

Change DefaultPreview to app and the issue is resolved.

user_78395180
user_107014520

Killing the "OpenJDK Platform binary" process from Task manager worked great for me.

Thanks to Abed Murad, which I saw on his link. (I have no reputation to cast a vote yet - my bad!)

It's an internal bug in AS, I reported it as a bug, you can follow up here https://issuetracker.google.com/issues/167701947

I used to try to delete the file R.jar on ...\app\build\intermediates\compile_and_runtime_not_namespaced_r_class_jar\debug and when it's locked, I had to close Android Studio then delete R.jar before reopening the Android Studio.

Is it (killing the "OpenJDK Platform binary") the best solution? I don't know, however, it's what I got for now. Once I get a better one, I'll update it.
Luck there guys!

user_161490330

Try removiong all *.xml files from %USERPROFILE%\AppData\Roaming\Google\AndroidStudioPreview2020.3\workspace

I figured it out from this google issue.

user_45860300

Invalidate cache and restart solved my problem

user_169548680
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