I have a problem with a weird bug in Eclipse. While editing some button's ID, for some reason Eclipse closed without giving any warning. So I restarted Eclipse, beeing annoyed since I didn't save my edits and everything was back to my last save. So I started renaming the buttons again, but now Eclipse tells me the resource ID already exists, but it doesn't. So I tried cleaning the project, but the problem remains. R.Java keeps those ID's even if they are removed from my project. So I checked my workspace files using Notepad++, but those ID's are not there any more. So anyone who has a clue why those ID's keep popping up in R.Java while there are not present in my project viewer or even the files itself?
Generally when one encounter ID-related problems the no brainer fix is to simply clean project. Also clean any included project libraries (if applicable) as they too have a generated R.java file with ID's.
Sometimes Eclipse auto-imports android.R.java causing problems - this is not a file you want to import but instead you want your own R.java, your.project.R.
If this doesn't help, the problem is often that the project does not build properly, therefore for not generating the mentioned R.java. Check your resources files, most likely some xml-file is invalid and needs attention before the project builds.
Clean project
Make sure android.R is not imported
Make sure your.project.R is imported
If R.java isn't generated, look for invalid xml in res folder
Sometimes restarting Eclipse does help, and you can't clean the project too many times
I figured it out! This my own mistake, I changed the ID of buttons, that had the standard names, eg button1, button2 etc. I left the update references box checked, but in the other XML files there where some buttons that still had the standard ID's. So they 2 got updated to the new names. So with my second edit, those where left having the old id.
Related
I already tried: clean, restart eclipse, create and delete a dummy xml file.
if there are no errors in my res folder, what else can cause R file to not get generated.
There can also be issues in AndroidManifest.xml. Sometimes, the Eclipse Package Manager tree will not show red X marks for files that actually have errors (though it has gotten better about that). So, I'd suggest opening up AndroidManifest.xml, and other resources that you have recently edited, to confirm that there are no errors there.
Also, bear in mind that R.java is not created until you do a build. Normally, we have Build Automatically checked in Eclipse, so a build happens on each save. If you unchecked that, either re-check it or manually do a build.
You might also check the Eclipse Console tab to see if there are red error messages there.
Finally, you can try a command-line build. It used to be that I would find errors there that, for whatever reason, Eclipse was not showing me. I have not needed to do that in well over a year, but it's possible there are still some scenarios where it might be useful.
I often faced this issue,and what i have experienced,is that you might have named some files wrongly like (begining name with numerics characters,using some allocated words like new,integer,class...)
I hope this could help you.
i almost face the same problem again. Few minutes ago i posted a question concerning that, the
R.layout.mylayout
is not recognised by eclipse despite that, the layout folder contains my xml file and the layout folder is located inside the res folder. the answer was to delete the R.java from the gen folder and clean the project and restart the workspace.
Now, i face the same problem again despite that i followed the previous steps to solve the error but the error which is that, the
R.layout.mylayout
is not recognise still exist and there is also exclaimation mark beside the project name.
is there any other ways to solve this problem
Project - > Clean
Select "Build Automatically" so that every time you clean the project, it will be rebuilt. And yeah, make sure you are saving the file before cleaning it (I know it is weird but sometimes the errors refuse to go away until you save it and then Clean it). Make sure that there is no error in the files in the layout folder, as it sometimes prevents the auto-generation of the code in R.java
Also, make sure that your code in MainActivity.java does not have import android.R. Eclipse tends to add that when you are managing the imports.
Please check you import statements.... If you have by mistake imported the android.R , then please remove it at once.... and then clean the project and see how it works...
Run the Lint tool. Right click your project and check under Android tools. check what is the issue using that.
I have a primitive sample Android project and I already had that trouble when it could not re-generate R.java (it arbitrarily does or does not, you never know).
At one moment, it re-generated R.java and now it contains all that is expected (my layouts and string values), but Eclipse highlishts source files with red as if it can't resolve something.
R.java has the variable, my class references that variable, Eclipse says it "cannot be resolved or is not a field".
Or course, I tried first to clean the project but this obvious thing did not work. Then I deleted the project from the workspace and re-created it, and everything is the same again.
What can I do now with that to make it work?
Check to make sure you are not accidentally including android.R
Double check all your layouts and xml files , a malformed xml file can cause the R.java to net be recreated.
Can you post your layouts ?
Recently I have been having quite some problems with R.java file. Now I have decided to do a backup and delete the file to see what happens.
Nothing happened, so I created an empty R.java file and hoped for the best. Now Eclipse seems to figure out that the file was tampered with and even issues a warning:
R.java was modified manually! Reverting to generated version!
And that's all there is. I tried building it manually but got no results.
So, I have two questions:
what should I do to force Eclipse to regenerate the file
what is happening here? How is the file created, where is the code that is generating the file?
I would appreciate any help. As usual the problem occurred just a few days before the deadline :)
I had a problem getting my Android app to compile, with seemingly inexplicable errors about failure to generate R.java.
The problem was caused by my previously killing the Android emulator during the build. Don't do that! A clue was the appearance of several left over *.out.xml files.
The solution was to select the project, click Project->Clean, and then manually delete all the *.out.xml files. Only then could I click Run->Run and have a successful build.
One more thing: I'm using Eclipse. I had to make sure that the project was selected in Package Explorer, and not just some random source file. Easy to not notice!
R.java is autogenerated on build. It's content is based on the resource files (including layouts and preferences).
When you deleted it, it was recreated, but if you create your own, you will get into trouble as the build system will not replace it.
You can simply delete it again (manually or by choosing Project->Clean) and rebuild your program.
I had this problem several times, and most of the times it is caused by some mistake in the "res" files, check everything is OK in all your res files, mainly XML, and after you can built.
For example, two common causes of this problem can be:
Didn't properly spell the name of a property in a Style in a XML file.
Didn't properly close a string in the XML of a locale file.
I found the problem - I have created a 9patch image with the patch area defined only on the Y axis (I was trying to prevent resizing on the other one).
The question remains: Why isn't there a warning about the error? Or if there is - where is it buried?
Sorry, but try to check the output in Eclipse. May be you have some errors that prevents Eclipse to finish build proccess(check your AndroidManifest.xml, is it correct?).I mean, that you should check all your resource files(string.xml, layouts, ...) and interfaces(*.aidl), may be there are some problems(inconsistent syntax, or something....) that prevent eclipse to generate R.java.
I had the same issue and it was that I had named a resource file (a .png image) using uppercase letters. (ImageButton001.png instead of imagebutton001.png).
Afther changing the name of the file my R.java came back.
Rgards,
Juan
If there's insufficient free memory the build tool will silently fail (Eclipse will not show any errors or report anything in the error log). Close your other open applications (e.g. the emulator and browser) then add a space to the application manifest file and save it.
As ponkin stated - you probably have one single problem that causes R not to re-generate itself, because of which you now have one million and one problem.
Do not try to create R class yourself. Try to think of the last XML you've been messing with, and check it for errors
I've had the same problem here
Make sure there are no errors is your Manifest file.
If you delete the resource string app_name in /res/values/strings.xml, it doesn't know how to generate R.java right.
I found this a problem when doing the HelloSpinner tutorial.
I found that an unwanted resource was causing an issue. As soon as I deleted the resource R.java was generated.
I've had this problem, to rebuild R.java I cut the code in the xml file I've just been working on (or try others if this doesn't work), deleting the file then creating another with the same name and pasting the code back into it. Hope this helps.
Something that can be good to know is that if an XML file contains a ?, then R.java is not regenerated and the error is not shown in the XML file (sometimes it shows up after a while)
I you have a line similar to:
< string name="questionmark"\>?< /string> <br>
try to change the ? to something else and see what happens to the R.java file - worked for me
I had a similar problem, I had renamed a .wav file in the Raw folder with a capital letter. When I changed to all lower case, cleaned the project and it rebuilt R.java fine.
As others stated, stay away from creating your own R.java file. I ran into the same problem when I first started with Android, and it took some time to figure out what caused by compilation errors.
What were you trying to do with the R.java file?
I had the same problem. I just went to:
Project -> Properties -> Android
and chose the right Emulator for my project, I had 3 different to choose from in that moment. I realized that i changed the Emulator in some given moment. So try to change the Emulator, that might help!
Good luck
I had the same issue with IntelliJ. The problem was that I had app_name defined twice in strings.xml For some reason, IDEA inspections didn't pick this up automatically.
I read this on another site and it helped me:
"If that doesn't fix your problem, try modifying your AndroidManifest.xml (just add a space and save). I've heard that will force the R.java to rebuild. "
So just add a space in the manifest file and then rebuild!
As a side note, usually those *.out.xml files are generated by trying to build your project whilst an xml file is focused in the editor
I had similar problem.Cleaning project didn't solve the issue and there was no error in the code or the uppercase or spaces in file names.
The solution was going to a popup window which came when you choose PROJECT-->CLEAN and then UNcheck the "Start a build immediately" option. Clean the project. Close and reopen Eclipse and then build the project (PROJECT-->BUILD).
The question remains why simple clean and build without closing Eclipse didn't worked.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Developing for Android in Eclipse: R.java not generating
I have imported a project into my Eclipse IDE, but it's giving me an error since R file is not generated automatically.
How can I edit the R file so that it matches my project requirements?
In another stackoverflow question, somebody answered this : you must get rid of warnings and errors (syntax and links) in your xml files. This plus doing a clean / build project.
Project -> Clean, and choose the option to build the project.
I found this happening to me with a broken layout and everything blows up. Relax, it's like that old mistake when you first learned programming where you forget one semicolon and it generates a hundred errors. Many panic, press all the buttons, and makes things worse.
Solution
Make sure that anything the R. links to is not broken. If it's broken, ADK may not regenerate R. Fix all errors in your XML files.
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.
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.
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.
If you can't find the issue. right click /gen/ -> Restore from local history... -> tick R.java -> click Restore. This doesn't solve the problem, but it will clear out the extra errors to make the problem easier to find.
I know there's already a lot of answers here, but this is the first link on Google, so I'm compiling all the advice here and hope it helps someone else new to this :)
Ok, I fixed it:
When I changed manifest to target 1.5 version, million errors appeared and only one wasn't related to inexistance of R class - in manifest file attributes "targetSdkVersion" and "maxSdkVersion" did not exist in sdk 1.5
Because of this R class was not able to generate.
I had a similar problem where the R.java file was not being regenerated after I'd added some icons and layout files. I tried cleaning and rebuilding and things got worse since then the original R.java file was gone and still wasn't regenerated. Eventually it dawned on me that there must be compiler errors for the compiler that generates R.java and we aren't being shown those in the console. Fortunately, I had noticed earlier that
it's an error if one .xml file refers to another which is non-existent and
it's an error to have upper case letters in your file names (why is that forbidden, I LOVE camel case).
Anyways, after renaming my icons and .xml files to all lowercase and then fixing all the references inside the .xml files, voila, R.java was regenerated. Just in time to feel good when I stopped for lunch :-)
To generate the R file again:
Modify something in layout->activity_main.xml
Save the file
Project->Clean...
Just delete the R file located in gen directory, and then try Project->Clean.
Then build your app again.
You can also right click on the project -> Android Tools -> Fix Project Properties. That should cause the R.java class to be re-generated.
I reopen eclipse, edit one of my xml files and then discover that my activy class was refering android.R instead of my package "R" :-)
My problem was in Manifiest file.
I have deleted launcher icons and did not reference the new ones on Manifiest :)
In order to regenerate the R.class, you will have to try multiple techniques.
Remove any R imports from your java source files: import R.android
Make sure to open the "Problems" panel by going to Window->Show view->Problems
If you do have some errors in your xml resources, you will need to correct those errors. In my case I had to change my id attributes to include the "+" sign as follows: android:id="#+id/grp_txt"
Now proceed to do Project->Clean
Finally do Project->Close, Project->Open
The "+" sign indicates a new resource id and the forces the aapt tool to create a new resource integer in the R.java class.
If you use Intellij IDEA you can click Build - Rebuild Project
If you accidently deleted your R in eclipse by "project clean" (don´t do this)
Rightclick on your Projectfile -> Restore from local History...
recreate your R
My Case:
Broken xml caused bug in R. (because of ä, ö, ü, letters in id)
clean project deleted my R.
What I Did:
recreated R from local History
checked for wrong R imports in my classes (like import android.R) and removed them
fixed that xml file and saved its content in an external txt file
deleted the xml completely from my project.
ran my project one time
put that fixed xml back at its place
and...
gave my girlfriend a big hug without a reason after freaking out like a Hulk.
My problem was errors in my XML files. Errors aren't always automatically detected in the Android Common XML Editor or Android Common Manifest Editor, so try using the regular text editor instead. For example, somehow some random gibberish from a .java file had been inserted into my manifest and strings.xml files.
Right click on any XML files (most likely in the /res folder or AndroidManifest.xml) and click "Open With," then select "Text editor." Make sure everything looks good and then save. Also, make sure to enable "Build Automatically" for your project. I had deleted my R.java file and it was rebuilt from scratch, so no need to restore it from local history.
Try to add a new "Android XML file" to, for example, the /res/layout folder. This might cause the plugin to to regenerate the R class.
You can just modify any xml files in /res folder and even just add a space and save, it will be regenerated.
I had the same problem - "R" missing. And none of the advices given here helped. Fortunately, I've found the reason - somehow Eclipse got lost the Project-Properties-target. It was unset. I don't know till now, what had done it, but setting it back helped.
So, attention - missing R can mean the missing target, too!
I have tried all the solutions above. But they unfortunately it did not solve my problem.
My R.java was gone as soon as I pasted a new picture to my drawable folder.
After reading the answers for this question I tried to delete the icon I have previously pasted (while Build Automatically Enabled) and everything was fine afetr. Hope this will help someone!
I had that problem and I just right-clicked on packet of my project and Build Project. Instantly the class R appeared in packet gen.
In case someone else finds this thread when Googling, like I did:
I had what appeared to be the same problem for a while, and after some digging I noticed that the R.java file got correctly built, but was ignored for only one of my source files. The problem for this particular file was that Eclipse had "helpfully" added the following line at the top:
import android.R;
That effectively hides the project R stuff. Just remove it and everything will be fine again...
You can use Eclipse's "Restore from local history" to restore your old R file if it has been deleted. After that you possibly see what keeps Eclipse from building your files (I've seen other errors than before which really helped fixing the problem).
May be you can go to project properties and select Android option and then define the target for the project. Once you apply the selected target API for this project, it will automatically generate R.java.
Mostly a problem with an invalid layout file.
Open the 'Problems' view and look for erros in XML layout files. Fix them and the R class will be recreated.
In my case there wasn't a real error. The problem view showed an error in a xml layout. The editor showed the xml error too. Just reformatting the xml using the auto formatter with 'ctrl-f' 'fixed' the xml 'error' and the R class was recreated.
You can just delete the R.java file from your project and it will regenerate assuming you have build automatically enabled. If you do not have build automatically enabled simply goto project->build all
For me, it was a String value Resource not being defined … after I added it by hand to Strings.xml, the R class was automagically regenerated!
This problem normally happens when importing from an existing project. Try to fix all errors from all .xml files in res folder, as well as Manifest file. Most likely the errors are shown at "match_parent" parameter, change it to "fill_parent". When all errors are clear, R.java will be appeared.
If there is no error on any .xml file. Try edit any xml file (like delete a letter and type it back) and then save the file, this will cause to generate the R.java.
I have a problem that the findViewById(R.id.edit_text) but return a TextView not a EditText. I think the problem is the R.id class has wrong id number, then, i clean the project then its works fine.
In my case it was an improperly named XML file that caused my R file not to rebuild. This did not show up in the package explorer, but it was shown in the LogCat. Look out for any warnings there about your res files. No matter how many times you clean your project, the R file will not rebuild until those errors are taken care of.