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.
Related
II updated AS to the latest stable build and all of my projects melted down. Only Java files in the main directory (com.company.app) can find R.java as intended. ALL of my subdirs can't find it. I did not have to import R.java before the update. I rebuilt my projects from scratch, restored backups, copy-paste to new projects from the backups, reinstalled AS, restarted PC, invalidated caches and restart, cleaned, literally every go to insta-fix-it solution that the internet always recommends and still I can't get this to work.
Can someone tell me how my subdirectories cant find R.java but other files in my main directory can? Is this a feature change in AS or something? Are we now supposed to import R.java? There are no XML errors. My project built before I moved any subdirectory files back to my main package. The package name exactly matches the one in my manifest.
Edit 1: I can rebuild my project and make R.java. The main package files still see it without the import, but the subdirs can't find it.
Edit 2: I can move a file from my main package to a subdir and it still finds R.java. This appears to be a compiler glitch.
Edit 3: Importing R.java makes the errors go away so I guess that is a solution. I am leaving the question open because this makes no logical sense.
You need to understand how App resources work.
When you build your android project, all of your resources in /res folder will be mapped automatically in generated your.package.names.R class.
Now you want to access the resources through the class. It's only make sense when you need to import the file when you use it in different package.
I had this issue, even though the error wasn't being underlined in red there was an error in my strings.xml. Go to Values->strings.xml and check if you duplicated any strings.
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
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 have a massive problem, and I can't find a single thread out there that specifies this problem.
I'd been watching Google IO, and the Android Studio was mentioned, I downloaded it, installed it, and opened my project into there, as I wanted to try out some of the new features, Fine and dandy, (on a separate note, I love Android Studio)
It was working before in Eclipse, and I literally changed nothing about my project, I was only looking around at the device preview features and stuff, didn't touch any piece of code what so ever, just having a look at some of the features..
Went back to eclipse, and my generated folder only showed R in, no tree structure of R or anything, just R.java, and R inside it, and everything in my classes were underlined, but it wasn't the R that was, it was the value after it (ie. Cannot find R.layout.main) which I thought was really weird, so I cleaned my project, and it disappeared, I now have a project without a generated R.java file.
To note; I changed nothing about my project, all my XML files were absolutely fine, i've tried every trick I can find on StackOverFlow and other websites (removing some of the XML's, painstakingly going over my 15 layout files character by character for an hour, removing imports, build paths, etc) and nothing works, and i've been trying to do this for almost 3 hours now.. Does anyone have any experience doing this, or any solution?
in the Gen section of your project, try to delete the R.java
It should re-generate, I had some issues like that in the past..
Give it go.
The R file may not be generated due to errors in the project.
Check your xml files in res folder. Also read Error log of the eclipse.
(Windows -> Show View -> Problems)
The best way is copy R.java from another project and Past it in gen
And then Delete R.java file then the system will recreate R.java back for you..........
I have a problem while runing my application in eclipse. I make some edits like this:
String res = "newvalue";
System.out.println(res);
But when I run the application I still receive "oldvalue" in output. After this I tried to delete main() function - and I run application and I see "oldvalue" in output again.
Maybe it's some cache in JVM, or smth. else?
UPD:
It's 15:35 on my clock now. But in /bin folder I see .class files with 14:33 timestamp. I change source files (.java), press ctrl+f11 in eclipse and files in /bin folder are still 14:33 ...
UPD2:
After cleaning the project I receive the following problem:
The project was not built due to "Could not write file: D:\projects\NelderMead\bin\ru.". Fix the problem, then try refreshing this project and building it since it may be inconsistent
SOLUTION
The problem was that eclipse can't write file to the folder with spaces and UTF chars in it's name. So, I copy project to the new clean workspace and it runs without problems! Thx all for help detecting the problem!
You're executing an older class files, the reason could be
a compile error somewhere else (see problems view)
or your changed accidentally the source path so that the new source no longer gets compiled.
Try to clean the project and make sure the new classes are compiled to your output folder.
The JVM doesn't have a cache for class files.
First, make sure the file is saved (there is no asterisk next to the file name in the tab). Usually files are saved automatically, but you could choose not to save files and never ask by mistake, the first time Eclipse pops up this dialog.
Then see what's going on in the Problems view. You might see something like project cannot be built due to the following reason. It may be because of compilation errors in the dependent projects.