Cannot resolve symbol R. [Tried all the solutions mentioned]

Question

I am making an Android app. Due to some reasons, my current project files got all messed up. To solve this issue I created a new project in Android Studio and copied the files from the previous project to this new project.

I carefully copied all the layout, values, java files at their right location. I replaced the relavant content from the new manifest and gradle files with new content.

Everything looked perfect and then I got the "Cannot resolve symbol R" error.

I tried all the solutions like Invalidate Cache/Restart, Sync files with gradle, Rebuild Project, Clean Project etc. etc. etc.

Still couldn't fix it.

Can someone help?

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Problem Details 1. I have correct package name everywhere (in AndroidManifest too) 2. I have proper and valid xml files 3. Even if I copied the files from other project the I've kept the project name and package names exactly the same. 4. I have only one app module.

Something's failing during the resource build. Look carefully through everything under the `res/` folder to check for any files that might have errors. — Mike M., Mar 26 '19 at 10:13
Possible duplicate of [R cannot be resolved - Android error](https://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error) — Gourav, Mar 26 '19 at 11:00

score 0 · Answer 1 · answered Mar 26 '19 at 10:09

0

Try to remove .R line from every java class .

answered Mar 26 '19 at 10:09

Talha Bilal

127
7

I've not imported R anywhere. Even if I try to import it shows the same error. – Nishat sAyyed Mar 26 '19 at 10:10
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then there must be a problem with your package name on java class , as these are copied from other projects with other's package name . – Talha Bilal Mar 26 '19 at 10:14

score 0 · Answer 2 · answered Mar 26 '19 at 10:16

0

You might have an error in one of your xml files, like a duplicated xml header. Check for every single one.

You can also update Android Studio as it now tells you the file and location of the error.

answered Mar 26 '19 at 10:16

P Fuster

1,901
16
27

score 0 · Answer 3 · answered Mar 26 '19 at 12:46

I strongly suggest you copy and paste your codes to individual right places if you want to move these to a new project. Copying folders and files to a newly created project would not work as there could be some lines that include your old folder paths

For example, your old project was in C://StudioProjects/YourProjectName so your codes should be in C://StudioProjects/YourProjectName/app/src/main/java/com/example/AppName but if you directly copy a file or folder to a newly created project, you could end up referencing the wrong path like C://StudioProjects/YourProjectName/app/src/main/java/com/example/NewAppName and this could blow your XML file which will lead to R cannot resolve symbol R.

Even though you put your folders in the same path, reference numbers changed in the new project.

Cannot resolve symbol R. [Tried all the solutions mentioned]

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3 Answers3