While compiling my project, I lost my R.java file.
I recreated the new project and replaced all my .xml files, .java files, and all my images in the project, but in that project I also lost my R.java file.
What should do to solve this problem? Can I recreate my R.java file for the project?
The R.java file is automatically generated by the Android tools ; so, you should always be able to re-generate it.
In this kind of case, forcing a clean and full-rebuild of the project generally helps.
In Eclipse, try :
Project > Clean
And choose to clean your project.
Copy all the src files to a backup folder.
clean and build the project.
You will get the R file.
Then copy back the files back to src
There might be 2 possibilities:
There might be any error in one of XML files.
Just clean and build your project again.
I have the same problem and it came down to having a resource file named 'case.xml'. It seems that 'case' is a reseved identifier. I just changed the name and that fixed the issue.
Usually "losing" your R.java file happens when you have an error in your XML. The same for the resources.ap_ FileNotFound issue.
Try to have a look in the error list and see if you have any errors in your XML files. Fix them and then re-build as mentioned above.
If you try all the above answer and you still getting the error then check your java file.
If there is any import android.R file then remove that sentense.
again try cleaning and building you project.
I hope this will do.
If you clean project while your .xml file contains an error then it will remove your auto generated R.java file, so don't clean your project while any of your .xml files contain an error.
Related
When i cleaned up my project my R.java file got deleted automatically. My project has huge codes. I don't want to re-create my project and copy the codes into it. I know the R.java file was deleted due to some error in resources. I have huge data in resource(layouts, xml, strings.xml etc). How to tract down which file in resource has the error. Please help. Thank you
When you rebuild the project again, R.java will get created.
R.java isn't meant to be manually edited. It's automatically generated by the build process and can/will change even if the file is never deleted.
R.java file will be automatically regenerated.But before that you have to check there will be an error in manifest ,xml and your java codes.If there is no error in that then clean your project and rebuild.
I accidentally deleted the generated java file R.java. Is there a way to rebuild this file as my project cant run or debug?
I tried cleaning the project then rebuilding it but that doesnt work.
Quick way:
Right click -> Restore from local history.
A window with all the changes you made should appear.
EDIT:
If there are any errors in the layout or any resource files the R file will not be restored after a clean - build
Without having more information, the answer is that R.java WILL be re-generated. Unless you have a compilation error.
Errors in layouts can also hinder R.java from being generated. So check that also.
You can clean and build the project to regenerate.
Gen files are regenerated automatically if you have the Project->Build automatically option is checked. If it's not checked, you need to rebuild it manually by Project->Clean...
Make sure ther isnt any error in a XML file, for example your layour files or Manifest. Clean your project after that.
After importing the project file disappeared R.java I tried Project - Clean, nothing ...
Yes, if you've any errors on your *.xml files. The R.java file will not generate. Try to clear that errors first. After, clean your project and try to run.
Hope it helps you.
Go to Project and hit Clean. This should, among others, regenerate your R.java file.
OR there might be any error in one of XML files.
//once you import your project. your library jar files wont get import it seems.
try to put that libs in project from C:/user/musanin/ and D:/java/work_Max
Clear all errors from the "res" folder and clean. It will generate your R.java file.
That implies errors on the layout or Manifest file , which are XML . Fix them first and clean the project
Without Removing the error present in .xml file your R would not appear..Open your .xml file and see what the errors are..If they are false error then just format the .xml file [ctrl+shift+f this will format your file] and save it. Then Clean your project and buil it again..You will get your R.java back.. :-)
Rectify the errors in the xml files and after that do
1) clean the project (or)
2) Restart the eclipse
I lost the R files once importing the project. The reason was target SDK conflict (in .manifest file) between appcompat library and my project (my project had 19 whereas appcompat was 21).
Change the project's android:targetSdkVersion into that of appcompat library project.
Clean the project.
And you should be good to go.
I used the instruction here :
Is there a way to get the source code from an APK file?
It was really good. I got almost everything of my lost project but no R.java file. It is nececery to import the project to eclipse. How can I extract this file from apk file? Where can I find it?
tnx.
R.java is created automatically on Eclipse and other IDEs. Removing the line from my main activity that says import R.java usually helps my IDE recognize that it's not there, and it recreates it when you try to run the program. If that doesn't work, try Project, Clean... and try running it again.
You cannot directly extract r.java file, but the contents of r.java file can be extracted using 'aapt' tool. the following command gives list of all resources and their respective IDs as present in r.java file:
aapt d resources name_of_apk
You don't need the R.java file. It is automatically generated by the Android SDK when you try to run your android application.
My PC went to sleep while battery was low. But when it recovered I found R.java file missing from my gen folder. My entire application is under crash.
The error is shown below:
If you recently added a new resource file and happen to use upper case letters in the file name, change the file name to lowercases and rebuild your project. That is what happened to my project.
The R.java file should be regenerated every time you do a rebuild of your project.
Clean the project,
Go through your code and remove all references to android.R.*
So when your R.java is corrupt or missing Eclipse tries to be helpful and thinks that the references in your code for R.something are missing the import file and inserts the android.R.* to your import list.
If you are using IntelliJ it has a rebuild R.java command.
If it is still missing then it means that something in your code is preventing it from being built. Pay attention to resource file names etc. Usually you can sport these naming problems in console view of eclipse
There are possible chances, you have a problem in your layout xml or in your code.
Try looking at file that you had open in your eclipse when it went to sleep, and code snippet that you were working at.
Edit:
R (resource file) regenrates at every rebuild of your project. For some error in your project your project wasn't able to build that why your R file is missing. All that you need to do is to fix issue in your files, code and xml files.
I got the same issue. Nearly I spent whole day working on it to figure out the reason and tried all the 100 solutions provided in the blogs. But nothing helped!!! After setting up a new workspace I figured out. Remove unnecessary libraries in your project. You can check this by Project-> right click-> properties-> Android-> and remove unnecessary added libraries. It worked :) Hope it helps some one.