I've found out that my R.java is never created. I'm using Android Studio and rebuilding does not solve the problem as well.
As far as i can see i don't have any mistakes in my XMLfiles as well.
I'm using W7. The error cannot resolve symbol R resolves.
Please help!
Code can be found here
I have created a new project and copy-pasted your code and it works fine (in Intellij IDEA 12 at least). I have dropped the line (this one android:theme="#style/AppTheme") with theme because you haven't provided code for your theme.
If you haven't added any gfx or other files and you're absolutely sure about the correctness of you theme style, then try to create a new project and do the same I did - code copy & paste.
If you have an error on your any code. No clean/build works to build R.java.
Just check your whole codes fix errors manually (Because of R.java is not builded it will show errors everywhere. So you have to find and fix errors on your own.)
It's usually due to an unaccepted character in the resources names, check for dashes, spaces and caps and let the project refresh
Related
I have seen alot of cases of "R cannot be resolved to a variable". Though my case is odd.
It was working perfectly about 15 minutes ago and within that frame, R has now vanished and cleaning the project won't cut it.
I have also ensured that all of my SDK parts are up to date before and after the incident. And the problem still occurs.
Can anyone figure out a solution as to why it would disappear just like that? Even though the SDK was up to date before R vanished?
And another question. Why does this R file cause so much trouble? (I am using Eclipse btw)
This can certainly be a nuisance.
Make sure any R. imports haven't sneaked their way in. Your imports should be bereft of any 'R.'
If you have changed your package name recently, ensure that AndroidManifest.xml is still pointing to the correct package. Using eclipse to refactor does not guarantee the manifest will update.
A side note, if you have errors in your xml files (layouts etc) this will cause a Resource error. Not all errors will be caught by eclipse, so you have to go through those files with a fine comb.
Sometimes simply cleaning, closing and restarting eclipse can help.
Check if you've recently added some music or pictures (any type of resource generally) to your res folder structure. Name of resource must be in lowercase completely, must not start with number...
Also look at the output in the eclipse console. It sometimes show error messages if it can't generate R.java
I am building an application and I added a new activity to generate a view. I compiled it. My application can not find anything that is on the format R.id.xxx or R.layout.xxx, I've tried also cleaning my project, closing Eclipse and opening Eclipse again, but nothing. The most strange thing is that before everything was working well. But now it can not recognize even the R.layout.main that is default of my principal activity. Anyone have an idea?
Also I have tried almost everything here: R cannot be resolved - Android error
but no result!
Solved
Thanks to woopsy, also I found the reference to this kind of problem
http://source.android.com/source/using-eclipse.html
it happens because Eclipse sometimes imports R when you press the combination ctrl+shift+O
Remove all your imports for the Activity and then have eclipse fix imports. I have had problems where eclipse wants to import a different R than the one I need.
First of All Check You have R.java File then check
import android.R;
Enter Yourpackages like import com.mypackages.prj;
If you are using eclipse, take a backup of your layout main.xml file and then from the eclipse new file interface create a new "Android XML File" and call it main.xml. copy back from the backup the contents into this new file.
try this.
check your xml files. there might be something wrong in it which is causing R not to build up automatically. To observe such errors, switch your view to Console tab
this is a common error. You need to just search your R.java file in generated section of your project directory in Eclipse. Need to import if the R.java file into the package then import . R;
I hope it will work for you. It was absolutely worked for me...enjoy programming
friends take care that u haven't imported R class, if you have delete "import android.R". The reason is there are two R things one R.java and R.class and we need the java, where we dont need to import rather than referring it. It worked for me and may be to you too.
I found the solution...For me works it
Poject->Properties->Android->Project Build Target (here choose android4.4 or 5.1.1 Android Open Source Project)->Ok
Project->Build All
This function ...
This problem can fix with this process: -
File---->Invalidate cache/restart.
it will restart your android studio and fix that problem
I'm working on an Android game with Eclipse, suddenly appears lots of errors in the code. Eclipse now don't recognize R.drawable resources ....
Console shows the following warning:
libpng warning: Ignoring gAMA chunk with gamma=0
What can I do to continue as it was?
I found the solution. seems there was an error in the import of the R file (resources file).
I replaced
import android.R
for
import package.name.R
Thanks for the help
I'm definetly not the most advanced guy out here but I have lost my R.java file more than a couple of times. You lose the whole thing whenever there is one thing that should be added but has an error. So almost all of those errors that you are seeing are secondary errors. Did you add an image or some other type of resource that you can think of when you lost your r.java?
Did you try Cleaning and Building the project? Go to Project > Clean and clean your project. Then try running it again. Most of the time when I see problems with my R.java a clean and build will fix it.
If that doesn't help, can you paste your code or a sampling of it?
I've just installed the SDK and all the stuff necessary for programming Android in Eclipse for the first time, and I've just find my first problem. After opening a sample project (Snake, for 2.2), there seem to be errors in the code. Well, the R library was not imported. I don't get why it was not already there, but I've imported it. All good? Nope! text = getString(R.string.tie);still has an error. Same with the rest of code (when it uses R). tie is not recognized, it's not shown in that usual blue of Eclipse.
Eclipse says that the problem is ADT 14... final stuff, or switch statements. Ok... I've read that. There's no switch there. That's not the problem. Eclipse suggests me to change .tie to any other thing... like button1. That's not useful, of course. I think the problem is R class, not ADT. Or maybe R class has some final statement so it is not accepted.
I've tried to see if it was that and, in opening the R.class, I get this message: "The source attacement does not contain the source for the file R.class." What now?
R is not a library, it is a resources file, which is generated automatically during the build from existing resources. Just make sure that resources are properly placed where they belong. Then build the project and everything will be OK.
try using project-->clean in eclipse.
if you imported R library remove it. and try again
Make sure you have the required package installed in the AVD Manager. Then, check your Problems view in Eclipse and look at all other errors, other then the R-related ones and make sure everything else is fixed first. If you have an error anywhere in your XML layouts for example, R will not generated.
I keep getting this when trying to start a new project
ERROR: Unable to open class file C:\Users\Levi\Desktop\Android\workspace\Droid1\gen\com\androidbook\droid1\R.java: No such file or directory
I tried changing preferences to alter build path to project, but it still wouldnt work,,,
Is subfolder on desktop a bad place to install Eclipse?
Clean works sometimes and should be tried. I also find that blowing away the gen directory and refreshing will cause it be to rebuilt. Try that as well.
However, sometimes even that doesn't work and I've been forced to remove the project from Eclipse and then re-import it. This, unfortunately, works for me every time if the above has not.
Good luck.
Im also getting that error, running a Project->Clean in Eclipse helps for me.
Project->Clean should certainly fix this (unless your resources won't compile for some seperate reason).
I remember that the first time I ran Eclipse (in mid 2009, can't remember if it was Galileo or Ganymede or whatever) on Windows Vista, it presented several problems that were eventually traced to Eclipse itself being in a directory whose path contained a space...
Usually, the above tips (refresh, clean) work for me. But lately I had a very persistant instance of this error, which was caused by something else:
One of the layout .xml files in res/layout contained a reference to a custom view (org.company.project1.MyView). However, I had changed the package path (org.company.project2.MyView), so the reference had become invalid.
Thus, if everything fails try browsing your layout .xml files for invalid custom element definitions.
Cheers
after spending hours trying to ultimatly discover the issue behind the Class Issue not being found, resolved,or directory not there issue....
sometimes yes the issue is due to a bad binary or xml... as sometime a clean will do the trick or a xml edit will solve the day.. when all else fails.... this may do it..
"create a new workspace"
go into the workspace.... and then
Switch to your old workspace... in the newly formed workspace...
this was my silver bullet. so frustrating to not have a solid answer.
using Version: Helios Service Release 2
Build id: 20110218-0911