I am having problems accessing the elements within the classes in the R.java file. I recently reformatted my computer and when I reinstalled eclipse, the proper sdks, and imported the proper files I am left with errors that prevent me from accessing my xml files. For example:
R.layout.my_layout will not be able to find "my_layout." In fact I can't access R.id, R.string nothing! The R.java file looks okay, everything is in there and I'm not getting an error for R or id/layout/string etc. its just the elements within the class that are unable to be found for some reason. Here is an actual error example:
Description Resource Path Location Type
main cannot be resolved or is not a field CatalogNumber.java "package name"
"main" is an xml file in layout. I actually just noticed that it does not exist in the R.java file however there are some xml files that are represented there that are still giving errors. What do you think?
First please go to project > clean. If this doesn't work look at your imports and if there is an import R. Android might have deleted it. Also check your xml files. One of them may have an error.
Related
I don't why the hell is R file getting lost. Everytime I build my project everything is fine. Sometimes I get errors while running my android project and sometimes my Eclipse gets crashed. At this situation when I restart eclipse my project will show compilation errors. Even after solving those things, When I build my project the R file is getting lost exactly at that time. And even if I import the R file the errors will move to the next variable. Is there any way to recover the R file or to protect it from getting lost???????
Generally this happens when you have an error in one of your xml files.Another possible reason is that you initially wanted to have your R class not in the default place where it is created but in your own package. So it is possible that R is created in its default location and your program is looking for it somewhere else.
if your project R file not generated automatically then this are the possibility i mention below.
If the R .* can not be generate means that you have some issue into the res/ folder. Check for errors in res/ folder.
Invalid file name: must contain only [a-z0-9_.]
all the res/* filename should be named with lowercase character, underscore and number between 0 and 9
Go to Project and hit Clean. This should, among others, regenerate your R.java file.
Also get rid of any import android.R.* statements and then do the clean up I mentioned.
Check your latest updates in SDK manager if possible some remain to update.
Also check target build was set to Android 2.1 (SDK v7) where his layout XML used Android 2.2 (SDK v8) elements (layout parameter match_parent), due to this there was no way for Eclipse to correctly generate the R.java file which caused all the problems.
I am working on one android application. Don't know why but i am not able to regenerate R.java file.
i also searched a lot about it. and also tried all the solutions i got from various place. but R.java is not generated.
if i import my project in another computer, then it is working fine. only have problem in my eclipse. :(
i also solved all the lint errors, warnings and also tried to clean and build project. i also checked my all .xml files as well as all images. all is perfect not any special symbols or uppercase. and and tried all the tricks which i got. but now able to generate R.java file.
please help me.. Thank in advance...
Edit :
right now i am getting one error like
Description Resource Path Location Type Error executing aapt: Cannot
run program "..\Android_SDK\build-tools\18.0.1\aapt.exe":
CreateProcess error=5, Access is denied: CreateProcess error=5, Access
is denied TestProject line 1 Android ADT Problem
Occassionally I am also fighting with this issue. Sometimes it's tough, but it's usually that something is wrong with your /res/ files. Usually XMLs.
First try to Clean your build, but you did that already.
Look for malformed XMLs, they do not have to be marked in red at first, but try to open them all if you don't see them popup in red. Check that you don't reference ids to another views in styles.xml, check for invalid characters in keys, check for invalid/unescaped characters in content of xml entities.
Also check properties of your project and make sure that all Java Build Path components are checked (Order and Export). Mainly Android one. Sometimes it happens to me, that it's unchecked making my project unbuildable.
If it works on another computer, it seems the code is fine. The problem seems to be either your toolchain or your Eclipse workspace.
Try the following:
If you use Android SDK Tools 17 or higher, make sure you install the corresponding Android SDK Build-tools in Android SDK Manager.
If the above doesn't help, create a new workspace and import your existing code into it.
This is common problem, which can be caused by many different situations.
What always worked for me:
If your R.java is not generated, your project is flooded with errors saying that class R is not recognized (obviously). Usually, somewhere between all those R.java errors, there was one other error (with different that all others) which is often overlooked because of hundredths R.java related errors. If i fixed this other error, R.java is generated after clean/build...
Edit: the "other error" i am talking about that is preventing your R.java to regenerate, is often found somewhere inside resource XML files...
The problem is in your installation path of Eclipse. Just check that your path doesn't have any spaces where you have installed Eclipse. And name should be proper for the Eclipse directory.
I also had the same problem because my Eclipse installation path got spaces in it, and my Eclipse directory name got changed to some symbolic name. When i renamed it to Eclipse and make the installation which contains no space, it got worked.
For example if Eclipse directory path is like
D:/New Folder/Android/Eclipse
Then it may got problem because of space between "New Folder".
Check your path and directory name and if it worked then check my answer please.
I was struggling with this issue for past one hour. I just solve it by
Remove the ".metadata" file from the workplace directory.
Then start the Eclipse.
Import the project from the workplace by File -> Import -> Existing project into workplace under General tab.
The R.java file will be generated. You need to import all other project that were in your workplace the same way.
Hope this will help someone
I'm working on my app and for this activity I was going to build a new layout file for it. However eclipse gave me an error stating that layout was not updated in the R.java file. So I read online that modifying manifest would update the R.java file but it didn't. So I clicked on clean project and my R.java file disappeared propagating errors across all my src files. Now I heard that it could be due to layouts named with capital letters but all my layouts start with small letters. Also even if I manually add a R.java file and click on clean, the R.java disappears after. I really don't know what to do now. I also tried most of the solutions from the similar questions but to no avail.
Any error on XML files will prevent R generation.
Check for mark errors and Eclipse console (some errors when parsing XML are shown there).
Also I've seen Eclipse generates some dumb files with .out.xml or .xml.out extensions. I'm not sure why it happens, but any "allien" file on res folder also prevents R to be regenerated.
Thanks for your help guys. I tried to look at every file to check for errors but after 30 minutes of scratching my head, I just opened a new project and copied each file to the new project and that is working now.
I am new to Android environment. For some reason, I am getting errors when trying to build. Specifically, these types where by the activity_main.xml layout file is being reported as not being found. However, I do see it there. There seems like there might be something messed up in my environment but I don't know what? I consistently get these types of error whether the resource exists or not.
setContentView(R.layout.activity_main);
Any help appreciated.
I'm assuming you are importing the wrong "R" file..
Check your imports in your activity.. see if you have import android.R;
If so, delete it.. and make sure you import the proper R file for your own project
Try these.........
- 1st when you create a ,XML file like main.xml file, you will need a Class that extends Activity and that must be mentioned in AndroidManifest.xml file.
- Clean the Project.
- Close Eclipse, and start it again. Don't Restart but Close it. Eclipse does behave weirdly.
If you have an error in one of your XML files, the resource compiler may not have generated an R.java file. This would then cause errors when you reference any resource ID in code.
Always fix any problems in the XML files before worrying about resource IDs not being found in code.
Check if activity_main.xml exists in the res/layout folder (make sure it's not inside res/xml instead). If it exists in the correcti directory, try opening it and check if there are any errors.
Also, rebuild your project by running Project -> Clean to make sure all resources are reloaded.
Check for typos in your package names. If you have renamed any of your package folders, 90% of the time this error is caused by typos in the AndroidManifest.xml file. Check if your matches your package names on app/java/com/packagename/yourappname
I have a primitive sample Android project and I already had that trouble when it could not re-generate R.java (it arbitrarily does or does not, you never know).
At one moment, it re-generated R.java and now it contains all that is expected (my layouts and string values), but Eclipse highlishts source files with red as if it can't resolve something.
R.java has the variable, my class references that variable, Eclipse says it "cannot be resolved or is not a field".
Or course, I tried first to clean the project but this obvious thing did not work. Then I deleted the project from the workspace and re-created it, and everything is the same again.
What can I do now with that to make it work?
Check to make sure you are not accidentally including android.R
Double check all your layouts and xml files , a malformed xml file can cause the R.java to net be recreated.
Can you post your layouts ?