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.
Related
When I was naming one of my activities in Android Studio, I accidentally clicked the "\" key and I've deleted that activity but now when I run the project it says I have an error in my .R java file..
I tried to delete the error which will fix my problem, but whenever I delete the line of code it just regenerates it when I run it again...
I've already tried; deleting the line, cleaning my project, and rebuilding my project. None have worked.
The line of code I need to delete is:
public static final int title_activity_song_one_hundred_nine\=0x7f0c0054;
How do I go about deleting this line of code for good? Thanks.
You need to clean your project by
Build > Clean Project / Rebuild Project. this should re-compiles your R file in android studio.
If still not work, you must have errors in your resource files. Check your xml files such as layout, string, etc.
Try this...
Close your app in an Android Studio/Eclipse.Go to your workspace where you have the project.Open that R.jave file in notepad and remove the "/" symbol then save it.
Now open it in Android Studio/Eclipse IDE. Your error may fix.
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 am working with an R.java file that is not getting updated with changes made in an XML file. After I try to clean the project up, the Java file is getting deleted and is not recovering automatically. My package name in the manifest file is correct. Does anyone know what the problem might be?
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.
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.