I'm working on my project in eclipse , but after adding some files I clean my project, but after clean the R.java file automatically vanish from my project & lots of error on my project.
again I tried to clean my & build it but my R.java files can't back.
What I'll do at this moment?
if R.java is not being automatically created then there is an error somewhere in your xml. Triple check everything.
Check your XML resources (especially these recently edited) for mistakes and sytax errors. When you have an error inside one of these files, the R class autogeneration will abort.
surely you have error in XML.
edit:
Other possible causes: Upper Case Characters in your resource file names; Invalid Characters in your resource file names (you can use only a...z, 0...9 (not as first character), . and _); File names starting with a number
thanks to Der Golem
Related
So, I deleted a couple of .java files from within eclipse because I didn't need them anymore. However for some reason another class still uses them and compiles without a problem. When I go to the declaration of the constructor of one of the deleted classes a .class file opens of that class even though I thought they got deleted by eclipse when I deleted their .java files.
I have tried to clean the project and I tried to find the .class file using the system file explorer in the folders that are listed in
project > properties > resource > linked resources. However I couldn't find them.
Now, since I deleted those files/classes there should be a compile time error wherever they are used but everything compiles without an error, even using the code that should've gotten deleted. A colleague that recently joined the project does receive compile time errors, since he doesn't have those class files. And I want to get them too, so I can fix the code where the classes were used. Of course he could show me the lines of code that are affected but if this happens again he would probably be affected as well as he would have the class files by then.
Try doing the following
Go to project > properties > Java Build path >Source
under that you can find Default Output Folder section, simply delete the classes folder under that location with in your project.
Try cleaning the project.
Or
Simply close the eclipse and reopen it again, sometime this would work for me.
Hope it resolves your problem
If you just deleted the sources, they binaries would still be there. So open the Navigator View and go to the project in question. Look for the bin directory and delete the appropriate class files. Otherwise, delete the project itself.
You should also ensure that no other programs depend on those class files.
I found the problem. Someone built a .jar file I didn't know of which contained a lot of old code.
I found it by right clicking the constructor and selecting
references>project
My R.java gives an error
public static final int 1405308882_more = 0x7f020000
Don't know or understand why its giving this error, i regenerate the R.java file and it still gives me the following above. and when i hover my mouse over it, it says
underscore have to be located within digits
I tried editing it but when it compiles it still regenerate the same name variable.
Please before anyone starts rating this question as usless take your time to understand it
I don't have error in any of my java files either in the src folder or layout folder every thing else is fine its just the R.java that generates that constant so please understand before you jump to conclusions. Thank you.
There might be some thing error in your res folder once check each and every file and clean your project once and refresh it again..
Sounds like the R.java file has not updated, try some of these general pointers to begin with:
Do not manually edit any of the files in the gen folder, as these are automatically built for you.
If you find it is out of sync then try refreshing the project.
If that did not work try a clean (project -> clean)
If that did not work delete the gen folder, from within Eclipse, (do not panic) it will then be rebuilt by Eclipse - however if there is a coding error of some sort it may not do this straight away.
Hope this helps..
It wasn't the XML file that was the issue. It was an image in the resource folder with a name that didn't follow the standard naming rules and thus made the R.java to generate that error.
The reason it regenerates same is because it regenerates from your code you should check the .xml files of this project the problem is probably at 1 of them try clearing xmls you have created then regenerate it.
I was doing some work on my app when I accidentally deleted the file R.java in the gen folder. Is there any way to get it back? I need it because it is giving ever activity errors. I tried copying my data into another application and that didn't work. I also checked my recycle bin and there was no file and cleaned. Please help?
Several ways to get out:
Simply modify(add a white space or so) in one of your resource files and save it, if the eclipse is enabled 'build automatically', the R.java will be re-generated again.
Go to project - clean project, clean your project and it will be re-generated when you run the project again
It is automatically generated file
Just clean and rebuild you project If there is no error{there must not any xml error which neither shown error nor let R.java build} then it will create your R.java file
again
Every Successful build just re-create new R.java file
R.java is auto generated when you delete it, make sure the xml file has no error . If this is also not solving your problem the start doing your project from scratch no copy paste.
on cleaning a project to update a image My R.java file in gen folder got deleted with no clue how , as a result giving errors how to recover it
Delete gen and bin folder. And perform build.
If R.java file is not generated, probably you have some errors with resources.
Check your Android manifest file. I bet you have a typo there. If manifest is clear, R.java will be automatically re-genrated.
Also remove all reference to the R.java file in your source that u might have imported mistakenly.
Check your resource files. Remember that your file names must contain only [a-z0-9_.] No "-".
The best way to know where the problem is coming from is to check the "problems" view in eclipse.
Many people have the same problem, the R file. In my case, i have some differents packages from different projects, and then different R files. When i import all of theses packages into one, and all of R file and layouts, they(the R files) disappeared.
My question is : How i can fix this ? I had some manipulations, like the Clean method, but nothing change, and the R file never comeback :(
Delete the "gen" folder.
Clean project through Project -> Clean...
if this doesn't help, you may have a bad file name or bad encoded string in your project.
Open the error file in the "gen" folder, scroll to the error.. if it's a string, just change it. If it's a bad file name, rename it.
Don't use capitalized letters in file names other than classes, no spaces...
If you have a string in a UTF-8 required language, make sure your editor is set to UTF-8 in Window -> Preferences -> General -> Workspace -> Text file encoding.
Never import any R.java. If you have any auto imported package saying import R.java, delete that as well. Clean should solve the issue. If not, then check if you have made any recent change in your xml file. At times, reverting back to your previous change solves this issue. If not, create a new project all over again. Track back your issue from where its generated
R.java is generated automatically when your program builds. If it fails to build, it can't generate the R file.
This basically means you have an error somewhere in your code that's preventing it from building.
To find the error in Eclipse, use your Problems window. If it's not open, go to Window > Show View > Problems or press the hotkey: ALT+SHIFT+Q, X
The Problems window in Eclipse will show you exactly what is preventing the application from building correctly.