Android R.java problems. R.java file does not update?

Question

I am having a problem with the gen/r.java file. When I create or edit files in resources such as layout /values/strings.xml e.t.c the r.java file does not update. I have followed a tutorial and it for some reason won't update. There are no errors in the xml file.

I have heard people say "use clean/build" e.t.c but this just removes the r.java file and I am unable to get it back after many attempts. This results in me having to redo the whole project again just to get the gen file back. Why is this happening?

Did you change the package of your application? If so, you should update it in the androidManifest.xml as well. — rekaszeru
– rekaszeru, Commented Apr 28, 2011 at 20:17

Kamal Trivedi · Accepted Answer · 2012-01-05 05:36:39Z

9

Project -> Clean works for me. R.java is deleted & Auto generated.

answered Jan 5, 2012 at 5:36

Kamal Trivedi

2393 silver badges10 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Albinoswordfish · Accepted Answer · 2011-04-28 20:16:26Z

6

I ran into this before, I work around we discovered was that the R.java file only gets generated after an edit to the Mainfest.xml file. So just make a quick change to that file.

answered Apr 28, 2011 at 20:16

Albinoswordfish

1,9677 gold badges35 silver badges51 bronze badges

5 Comments

Superunknown Over a year ago

Hi sorry for the daft question as I'm a bit new to android programming. Which changes should I make to the Mainfest.xml file? There doesn't seem to be any errors?

Haphazard Over a year ago

I think he just means put an extra space anywhere and save. He expects this to force the regeneration of R.java.

Albinoswordfish Over a year ago

Just make a fake modification, ie "adding a whitespace, then deleting it"

Superunknown Over a year ago

Hi just letting you know I have done the same and there's no effect :/ Same problem.

Ross Larson Over a year ago

Editing the manifest file worked for me when I had this same issue

Shivam saxena · Accepted Answer · 2012-10-05 07:21:56Z

5

this will work for you..... Go project > clean . it will generate your R.java or you can delete your R.java and Eclipse will automatically generate your R.java.

answered Oct 5, 2012 at 7:21

Shivam saxena

1511 gold badge3 silver badges8 bronze badges

Comments

theraccoun · Accepted Answer · 2012-03-04 08:17:00Z

1

There is a good possibility this is because you are not abiding by appropriate naming conventions in your res folder. I had this same issue and - using intellij IDE - right clicked on the res file and hit 'Force regenerate R'. Intellij told me:

Invalid file name: must contain only [a-z0-9]

So, in addition to what others have said here, check your naming conventions and make sure you haven't included any caps, underscores, dashes, etc. in the files you put into your res folder.

answered Mar 4, 2012 at 8:17

theraccoun

111 bronze badge

Comments

mridul · Accepted Answer · 2013-08-05 07:27:11Z

1

I face same problem during myproject. Make sure that there is no error in any of the xml file. If one of the xml that contain error R.java file does not update.

edited Aug 5, 2013 at 7:27

answered Jul 27, 2013 at 20:05

mridul

2,1169 gold badges30 silver badges50 bronze badges

Comments

user2778471 · Accepted Answer · 2013-09-14 04:23:21Z

1

You should check your Manifest file for correct path for the packages. Generally when do changes we forget about the class path for the MainActivity or we rename the main class or package. Then remove the R file and do the Project -> Clean , to regenerate R file. Hope this helps.

answered Sep 14, 2013 at 4:23

user2778471

111 bronze badge

Comments

Isaac G Sivaa · Accepted Answer · 2014-09-25 17:26:18Z

1

I had same problem, and when I check tab Console, there red line that explain me there a wrong name file at picture in drawable folder. After rename it, everything working fine.

edited Sep 25, 2014 at 17:26

Isaac G Sivaa

1,2994 gold badges15 silver badges32 bronze badges

answered Sep 25, 2014 at 16:45

Yukaleoyka

111 bronze badge

Comments

Javier · Accepted Answer · 2015-10-30 17:00:55Z

1

The problem could be that you have 'import android.R' at the head of the file or near it. If it is the case, remove the line and try again.

answered Oct 30, 2015 at 17:00

Javier

1891 silver badge8 bronze badges

Comments

kinghomer · Accepted Answer · 2012-01-31 09:43:15Z

0

Check if ID foreach UI is like

android:id="@android:id/tabs"

I had the same problem, and changing in this way:

android:id="@+id/tabs"

Solved the problem!

answered Jan 31, 2012 at 9:43

kinghomer

3,1612 gold badges35 silver badges57 bronze badges

Comments

zeitue · Accepted Answer · 2012-03-04 08:27:37Z

0

I have had this problem before, here are some ways to fix it

1. make sure in the Manifest.xml that the package is set to the right name.
2. make sure your gen matches your package name example 

gen/com.expample.pack/R.java

Also I have found if you edit it in eclipse it will regenerate.

answered Mar 4, 2012 at 8:27

zeitue

1,6932 gold badges22 silver badges47 bronze badges

Comments

Steve NDENDE · Accepted Answer · 2015-02-28 00:58:09Z

THE MASTER HAS ALWAYS A SOLUTION. (All solutions are not the good)

Experience is better than all

If your problem is that the "gen/ R.java" isn't updating the new ID,DRAWABLE or Strings that you declared, it's simply because there's a fatal error in one or some of your XML pages.

1 : the most of times it's with the res/values/string.xml file , so go in the file, click "XML View" at the right of "ressources" then you will for sure notice a red-mark at the right or the left of your XML page.
- focus on it :
  - you can read something like "error: apostrophe not preceded by \ (...)". That means in your text, there is one or more apostrophes. the solution is to preceed all the apostrophes with \ back-slash. -
    - You can fix all the apostrophes pressing : CTRL+F and insert an apostrophe(') at the first box then a \' at the second. then click the "Replace all" button at the bottom of the dialog.
2 : give me your error, and i'll answer you in less than 1h

Stephane Mathis · Accepted Answer · 2015-09-02 14:40:38Z

-1

I got this error while I used camel naming conventions in files under the res folder of my application.

I have corrected them and cleaned my project, it resolved my issue.

edited Sep 2, 2015 at 14:40

Stephane Mathis

6,6226 gold badges46 silver badges71 bronze badges

answered Sep 2, 2015 at 13:52

Xavor Nik

11 bronze badge

Collectives™ on Stack Overflow

Android R.java problems. R.java file does not update?

12 Answers 12

Comments

5 Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

12 Answers 12

Comments

5 Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related