I'm working on android 2.3.3 , when I clean my project on eclipse the generated class R.java is deleted , I tried to fix the projects properties by a right click and choosing Android tools , but it does not works.
How can I regenerate the R.java ?
Thank you
In Eclipse :
Select Help > check Updates...
Select the Installed Software tab.
Click Update...
If an update for ADT is available, select it and clickFinish.
Restart Eclipse.
If there are any errors in the layout or any resource files there will be no build happening and the R.java file will not be created.
Please solve the errors and then try to clean the project.
Everytime you clean the project and it rebuilds, it imports
import.android.R
so, delete this import and remove all errors from xml files. It will work.
Also if you tried to speed up eclipse and unchecked
Preferences - > General -> Startup and Shutdown - > Android Development Toolkit
check it back and restart eclipse, then R will generate automatically
Related
I tried to clean my project through Project->Clean and then suddenly all my R.java files in all my projects have been deleted. I don't know how to regenerate it now because I have hundreds of errors now...
How do I get my R.java files back?!
This happened to me yesterday, there are a few options you can try.
First try building the project again.
If that fails, try removing the gen file in eclipse and clean again
If that fails, try checking your xml files if there is any error
If everything fails, create a new project and copy-paste all layouts/src files to the new project.
EDIT:
I searched for this yesterday, and I tried every possible solution, but only creating a new project helped.
Do follwing tasks:-
If there are any errors in the layout or any resource files there
will be no build happening and the R.java file will not be created.
Please solve the errors and then try to clean the project.
Or If no resource errors then try this step also In Eclipse :
Select Help > check Updates.
Select the Installed Software tab.
Click Update.
If an update for ADT is available, select it and clickFinish. Restart
Eclipse.
Right click on your project in Package explorer in Eclipse. You will
get a number of options. Go to Android Tools-> Fix Project Properties
so see if that helps.
You should have errors indicating that R cannot be resolved to a
variable. Right click on your project from the Package Explorer and
select Build Project. Be sure Build Automatically option is turned
off (uncheck in Project > Build Automatically).
R.java files are generated automatically by Eclipse. Check if you have Project > Build Automatically checked or not. If not, check it and it should resolve your issue. Alternatively, check your project for other errors, preventing the R.java files form being generated.
If the issue still persists, try restarting Eclipse.
I accidently deleted my R.java after cleaning the project (Project->Clean). Is there any way to restore or re-create the file?
I tried to build the project but R.java still missing from the project.
Here's a the things I ahve tried.
Rebuilding the project (failed)
Manually creating R.java and wait until the adt will generate the content (failed)
Did Project->clean another time (failed)
Deleted the gen folder and waited until adt will re-create it (failed)
The answer:
Created new project and copied the files that not auto generated (succeeded)
You have to build the project to be able to use the newly added resources.
Cleaning a project removes all auto-generated files. Building the project it should automatically create them. When you Clean a project, there's an option to start a build immediately after clean up.
Here's a few things you can try (did the same procedure after manually deleting the "gen" directory.
After you have deleted the gen directory, go to Project > Clean ...
You should have errors indicating that R cannot be resolved to a variable. Right click on your project from the Package Explorer and select Build Project. Be sure Build Automatically option is turned off (uncheck in Project > Build Automatically).
Errors regarding R should have now disappeared. Now, perform a Project Clean once again. All errors should be gone.
Let me know if this works for you.
Build the project again an do not worry, R.java is generated each time the project is built
I will automatically create by eclipse no need to create by us. just build the project i.e save the changes will automatically build it for u.
R.java file is automatically created when you build the workspace, so it should be generated again with the next cleaning of project, unless you have errors in java or xml files, so check if you have errors in your project and correct them first.
In the eclipse you have down to the clean project you have option Build Automatically try to enable it....
Just click Project > Build Project
When you build the project, you don't get R.java.
You should check external library. Just remove the external library and add external library.
Android projects get tangled easily.
Just Restart the Eclipse will solve this Issue as the workspace will be freshly Build ! go to
File -> Restart
Try this method by first right click on ur project folder -> Close Unrelated Projects!
Its the fastest way to avoid frustration by going it into Build,preferencen,properties,blah blah.....
Moreover, this technique always works when the R.java file is deleted and not restored back immediately !
Evenafter the problem persists then make a new project and add copy ur xml and java files to that project , delete the previous one . . . .
I had a similar problem: building the project, the R.java file was missing. I built the project, but there were errors in the resource XML file. Correct them, then rebuild. When there were no errors anymore, the R.java was recreated and contained all the R.id.xxx items I had inserted in the resource.
This recently happened to me (10 mins ago) for my Android project, and my solution was a mix of things I read in some answers here.
What I did to fix was:
revert to older version (I used Github)
R.java still missing so I deleted "gen" and "bin" folders
R.java was generated and errors disapeared
This was done using Eclipse Luna. Good luck.
Gradle Project Tab
I tried clicking all the stuff under Gradle Projects tab, and noticed a few small errors, example: I had a capital letter in the drawable folder. I ran anything that had to do with processing or updating or generating resources. final one I did was "processDebugResources"
missing R folder
I had also noticed the folder circled in the above image was missing, running "processDebugResources" seemed to have regenerated the folder, although the others I clicked under the Gradle Projects tab could have also helped
I'm trying to use the SlidingMenu library. As described, I created a new Android project using the library directory, tried "Project > Clean" to generate the R.java but doesn't work.
The curious fact is that if I open the project properties and uncheck the "Is Library" all will work and R.java file is generated without errors. Besides the errors with the lack of R.java file, the tab "Problems" presents this:
Unparsed aapt error(s)! Check the console for output.
If I remove, as suggested in several responses, it appears again when I clean the project.
I appreciate any suggestion.
Un-checking and re-checking and "is library" helped for me.
Under Preferences > Android (for that lib project)
There are many thing to get back R.java
clean project
Build project from project
change the api of ex 2.2 to 4.0 and 4.0 to other version it will (re)create R.java file
finaly yet you cannot able to get R.java file then copy R.java file from other project paste it into gen folder then just build project.
eclipse -> project -> build automatically -> check it
If it is already checked, uncheck it and check it again.
Solved.
I do not know exactly what the reason, but the solution was to remove the Eclipse, the Android SDK and use the ADT Bundle from this link: http://developer.android.com/sdk/index.html
Before I was using a standard Eclipse IDE with the ADT plugin.
Thanks for the replies.
When I changed some design in .xml file, R.java file automatically deleted. How can I get back that file and what is the solution to resolve this problem, that in future this problem does not occure.
check all your errors in xml files structure (layouts, string etc...) even if sometimes they are not easy to spot.
My advice is to undo the latest things you've done until you find where the errors were and fix them.
Once they are all fixed the R file will be created again (maybe you need to clean your project: project -> clean)
In the future just try not to break the xml files and this won't occur again xD
You can also disable automatic build in your Eclipse IDE(Menu -> project- > Uncheck build automatically). This way the R file will be recreated only when you manually build the project and not when you save changes in an xml file.
Fix your errors and the R.java file will return...e.g when i added an image in my resources folder its name was in uppercase....when i changed it to lowercase,immediately after doing it my R.java file returned...its all due to errors...just fix them and it will return
I agree with #maid450.
I also have faced similar situations.
If your problem isn't resolved after all this, ultimate option is to create a new project, and copy files to it.
one solution is that Go to Eclipse project tab -> uncheck Build Automatically -> Clean the project.Make sure that there is no error in your project also don't try to edit the R.java file one it will created. Then manually build the project. you will get the r.java file.
The best solution for Mac/Eclipse user is to go to the SDK Manager and re-install the Android SDK Build-tools, and then restart Eclipse.
For some reason after performing a Clean action on a project the R.java file for all projects happens to be deleted from the system.
Clean the project.
Menu [Project] -> [Clean...] -> Select you project -> [OK]
Project will rebuild automatically, if not, chek
Menu [Project] ->[Build Automatically]
The R file deleted automatically when I changed my activity_main.xml in Android Studio.
What I did was copy the R java file from another project and paste it into the project in which it got deleted.
Hope it helps. :).
Location for R file.
Project/app/build/generated/source/r/debug/com.android.'projectname'/R.java
Where is the R.java file in Android Studio?
I just reformatted my computer. I have windows xp sp3 32 bit.
I install java jdk
android sdk
eclipse ide
When I go to make a new android project i get this error.
Project 'HelloAndroid2' is missing required source folder: 'gen'
Please help i'm new to eclipse so give detail responses.
I just got this problem when I was trying to import a project that was originally created with a version of the SDK that is no longer installed on my machine.
Right click the project. Select Properties. Go to Android. Select a Project Build Target. Click Ok. You might have to clean and rebuild the project as well.
Right-click on the "gen" folder in Eclipse and select Properties. Then, remove the "Derived" checkbox. Then clean the project.
Most likely, there is a problem with one of your resources, preventing R.java from being generated in the gen/ folder. You should have error messages in your Console related to this problem.
Delete the "gen" folder. Then clean the project. Then build the project again. In my case it worked.
try this...
Right click on the project in eclips
Android tools -> Fix project properties
its works for me
ok , here's what worked for me:
delete the project and make sure you are not deleting it from the disk!
import it again and it will solve the problem.
Good luck....
My case was: I imported Zhou Weikan's cocos2d-android and the error emerged. The most straight-forward solution that came to my mind was to create the folder (right-click on the project in Package Explorer -> New -> Folder and then create new folder named 'gen'. It worked in my case.
delete the gen and its content and clean the project again.
Go to project
Right Click
New Folder (Res)
In my case it works Fine
I tried all these things and none of them worked. One day all my projects are running, next day all my projects have an empty gen folder?
After a series of tests to resolve the phantom missing R.java, the one that led me to a drastic action is when I looked at the Properties > Android and the Project Build Target was greyed out and the project wasn't linked to any SDK, almost as if there were no SDKs installed. This was after I uninstalled 4.2 and reinstalled all tools and SDKs...
Long story short, after trying everything I could find online, I just deleted the whole "adt-bundle-mac-x86_64" folder in my workspace folder, unzipped the original download, and dragged the original folder back into the workspace.
This works as a last resort, however you will have to import all of your projects back into the package explorer by New > Project... > Android Project from Existing Code, and make sure you have the "Copy projects into workspace" UNCHECKED.
IMPORTANT: You will find that you can't do this if your "MainActivity" file is always named "MainActivity," so just for future project creating, it's good practice to always name your main activity something different each time.
This error occurred when I tried to graphically add a grid layout. Deleting the grid layout folder fixed the problem for me.
My solution was to install android sdk build tools with Android SDK Manager.
The probkem was that whenever I clean the project, the gen directory becomes empty.
Hope it will help!
if gen folder or R.java file is not generated then first check error in XML file and make sure android menifest.xml is present.
Right click on the project> Properties> Android > use the latest API
takes care of everything!
In my case, the solution was downgrading the target from android-22 to android-19 at project.properties