R cannot be resolved to a variable (new android project)

Question

This happens for a new project too!

The gen folder is empty. No errors in activity_main.xml file.

I have tried:

Project->Clean
Project->Properties-> check android version
Project->Build
Re installing eclipse (latest)
Re installing ADT plugin (latest)
commenting lines: setContentView(R.layout.activity_main); and getMenuInflater().inflate(R.menu.main, menu); and building project

but still the gen folder is empty! help!

http://stackoverflow.com/questions/16611223/how-to-fix-broken-project-where-r-no-longer-recognised/16611303#16611303 — Raghunandan, May 17 '13 at 18:20
Carefully check the _Problems_ window. Often there is an error in a resource XML file that is not marked appropriate. — Trinimon, May 17 '13 at 18:20
http://stackoverflow.com/questions/16608524/eclipse-giving-error-missing-r-java-file-after-recent-update?lq=1 — user1784833, May 31 '13 at 19:17

score 21 · Accepted Answer · edited May 23 '17 at 11:45

21

This solved my problem: Eclipse giving error, missing R.java file after recent update

It was the latest ADT update. After the update we need to install android sdk build-tools.

edited May 23 '17 at 11:45

Community

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answered May 17 '13 at 18:36

Frozen Crayon

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score 4 · Answer 2 · edited May 23 '17 at 11:50

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I assume you have updated ADT with version 22 and R.java file is not getting generated.

If this is the case, then here is the solution:

Hope you know Android studio has gradle building tool. Same as in eclipse they have given new component in the Tools folder called Android SDK Build-tools that needs to be installed. Open the Android SDK Manager, select the newly added build tools, install it, restart the SDK Manager after the update. Got this answer from this link. Eclipse error: R cannot be resolved to a variable

It's working for me now

edited May 23 '17 at 11:50

Community

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answered May 21 '13 at 13:48

stickypens

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Thanks! Android SDK Build-tools worked. – Kris Krause May 29 '13 at 22:20

score 2 · Answer 3 · answered May 22 '13 at 07:13

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The solution is to restart the SDK Manager after updating the SDK tools to version 22. Only then the newest version of the Android build tools appears and can be installed. This fixed the error for me.

answered May 22 '13 at 07:13

Display name

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lopez.mikhael · Answer 4 · 2013-05-18T10:24:19.670

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I had the same problem.

I solved it this way:

In the project properties (eclipse) -> java build path -> order and export make sure that all your jars in the libs folder are checked.
And "Android Tools -> Fix Project Properties" then "Project -> Clean"
Be careful not to forget to put in: "Project -> Build Automatically"

This is a problem with the updates of Android SDK (tools version 22, platform tools version 17).

edited May 18 '13 at 10:24

answered May 17 '13 at 18:20

lopez.mikhael

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They are all checked. The problem persists. – Frozen Crayon May 17 '13 at 18:24
I suggest you remove your project and import again while trying to restart eclipse. – lopez.mikhael May 17 '13 at 18:26
If you use another library project you must also do what I wrote for this project. – lopez.mikhael May 17 '13 at 18:29
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Check your layouts files.many a times when there is an error in your layout file is when R is not recognized. Check all closing tags. – Purnimathy May 18 '13 at 16:12
Thanks! This solved the issue on R cannot be resolved – KarenAnne Nov 13 '14 at 10:35

R cannot be resolved to a variable (new android project)

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