Eclipse: R not found after updating Android ADT to revision 23.0.5

Question

I have updated Eclipse ADT from revision 22 to 23.0.5 but after updating it is giving an error of R not found. I have restarted the eclipse couple of time but problem persists. What could be the issue? See my SDK status as attached in picture below.

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Do you have any sort of errors in your XMLs? (Values files perhaps) — Vlad, Oct 30 '14 at 15:49
Did you remember to `Help/Check for updates`, after upgrading the SDK? — Phantômaxx, Oct 30 '14 at 15:55
Is it a windows machine? Can you see whats the error you are getting in problems view? — km86, Oct 30 '14 at 16:03
There is not any error in xml file, yes it did help/check for updates but it said no new updates available after 23 revision. — Adnan Amjad, Oct 31 '14 at 07:36

score 2 · Accepted Answer · answered Oct 31 '14 at 07:50

2

You don't have Android SDK Build-tools installed on your machine. Just install the Android SDK Build-tools version 19.1 and this should resolve the problem.

answered Oct 31 '14 at 07:50

ZeeShaN AbbAs

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score 1 · Answer 2 · edited May 23 '17 at 11:51

Possible reasons for your error

There is some errors in xml
You might be using a image or a resource name that does not exists
As far as i know updating ADT will not cause this error

Double check on above things because if resources are referenced correctly R.java will automatically be generated !

Also install this update

enter image description here

Still if you are not able to resolve check these ways to do it below

I am quoting this answer from another StackOverflow Question

Make sure that anything the R. links to is not broken. Fix all errors in your XML files. If anything in the ADKs are broken, R will not regenerate.
If you somehow hit something and created import android.R in your activity, remove it.
Run Project -> Clean. This will delete and regenerate R and BuildConfig.
Make sure Project -> Build Automatically is ticked. If not, build it manually via Menu -> Project -> Build Project .
Wait a few seconds for the errors to disappear.
If it doesn't work, delete everything inside the /gen/ folder
If it still doesn't work, try right-clicking your project -> Android Tools -> Fix Project Properties.
Check your *.properties files (in the root folder of your app folder) and make sure that the links in there are not broken.
Right-click your project > properties > Android. Look at the Project Build Target and Library sections on the right side of the page. Your Build Target should match the target in your AndroidManifest.xml. So if it's set to target 17 in AndroidManifest, make sure that the Target Name is Android 4.2. If your Library has an X under the reference, remove and re-add the library until there's a green tick. This might happen if you've moved a few files and folders around.

What to do if R doesn't regenerate

This usually happens when you have a broken xml file.

Check errors inside your XML files, mainly within the /res/ folder
Common places are /layout/ and /values/ especially if you've changed one of them recently
Check AndroidManifest.xml, I find that often I change a string, and forget to change the string name from AndroidManifest.xml.
Check that Android SDK Build-tools is installed. Window->Android SDK Manager->Tools->Android SDK Build-tools
Make sure when you update the Android SDK Tools, you also update the Android SDK Platform-tools and Android ADK Build-tools. Build fails silently if they don't match.
If you can't find the issue, right click /gen/ -> Restore from local history... -> tick R.java -> click Restore. Even if it doesn't solve the problem, but it will clear out the extra errors to make the problem easier to find.

Last but not least clean and run every-time u check for above possible ways

I have created new Test project for testing this error, but still R not found error exist — Adnan Amjad, Oct 31 '14 at 07:47
Thanks Devrath for your reply, I was not having build tools. — Adnan Amjad, Oct 31 '14 at 08:16

score 0 · Answer 3 · answered Oct 30 '14 at 15:47

0

Cleaning your project normally fixes this.

Click 'Project' -> 'Clean...' Select your project from the list and hit 'OK'

answered Oct 30 '14 at 15:47

Chris Stillwell

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Cleaned couple of times but still problem persists – Adnan Amjad Oct 30 '14 at 15:49

score 0 · Answer 4 · answered Oct 31 '14 at 07:54

check your sdk folder (add-ons folder ~ tools folder - about 9 ~ 11 folders)

1.2 if some folder was deleted, download ADT(in google website) and copy & paste sdk folder.

sdk folder was good, check android target api is exist(project right click - properties...)