When I create a new android project in Eclipse, and I choose to have a default main activity, my R.java file does not get generated.
I have seen some questions online and on this site about R.java not being generated but all are due to some manual action/mistake that had to be corrected during the development of the application.
However, does anyone know why R.java would not get generated for a brand new android project, where I have made no manual modifications whatsoever?
I think your problem is just the latest update of the SDK.
Test the following operations on two projects :
In the project properties (eclipse) -> java build path -> order and export make sure that all your jars in the libs folder are checked.
And "Android Tools -> Fix Project Properties"
And "Project -> Clean"
I hope you have helped!
ADT version 22 requires that you install "build tools". To get it to work i had to update:
SDK Tools
Platform Tools
Then install:
Build Tools
This link recommends you add build tools to your environment path. I had to do the following before the R.java was generated:
Append build tools to PATH environment variable
Restart Eclipse.
Make sure your project is free of errors and problems. You can use Windows-View to find and rectify them. Common mistakes are in the layout files.
Check the AndroidManifest file and see if the activity names match the classes in your source folder. Clean and rebuild.
R.java creates every time when you create android project first time r.java created by default
so check for the errors and clean the project.
Related
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.
I am adding admob external jar in my project and i am using andengine as a library project but when i try to export the project i get this error. Also adding andengine library project adds andengine.jar also in android dependencies. Is that suppose to happen?
I have tried almost all other answers on stackoverflow but nothing seems to work.
If anyone can help me pls?
Following is my project image
Just solved this problem. I updated my sdk to latest and that solved the problem!
Try exit eclipse, backup if you want, delete gen and bin folders. Start eclipse again, build then export.
This usually happens to me after either eclipse has been running for a long time or after I have build a signed apk successfully. To fix it I just restart eclipse.
In Eclipse, select the project causing the error- go to the menu project -> properties -> java build path -> libraries and remove all jars including the android jars.
Then, right click the project, go to android tools -> fix project properties. Then, add back any other external jars you wanted to add to the build path following the same menu project -> properties -> java build path -> libraries. To ensure there are no errors due to missing libraries.
Then, do a 'clean' on menu project and build again. It should work.
I imported a project. I see import errors in each file. In the problems view I have the following errors:
Project X is missing the required source folder 'Gen'
The project can't be built until the build path errors are resolved
Unable to resolve target 'android-10'
In my package Explorer view, I don't see the gen folder so that I could tweak it.
What should I do, i am new to android.
check whether you have android-10 version installed.
Clean the application
Right click on project -> select Android tools -> Fix project properties
Re build the application.
Try to delete the folder (if it exists) and do a Project Clean in Eclipse. Mostly this helps to recreate your gen folder.
You can try to recreate it manually and make it a source folder, too!
Make sure your project build target and API level you're using match.
i am trying to build an android application in eclipse. My issue in detail is as follows:
I first setup the sdk and adt plugin along with the svn for eclipse.
Then I imported an existing svn trunk from (File->Import->Checkout projects from SVN).
Then I face the following errors:
a. Project has no default.properties file! Edit the project properties to set one.
b. None of import files are being resolved. It includes java.io, and all the basic java classes. I checked the Compiler Compliance level too.. It is set to 1.6
c. When I check into project properties for the issue, under Java Build Path: I find "Build path is entry missing: Projectname/gen"
Then in the libraries tab i find: "Unable to get System Library for the project".
It would be really nice if some one can throw some light on this issue. plz let me know if u need any more description.
Thanks,
Maverick gugu
Did you check out .classpath and .project files from svn to? My usual scenario is to checkout files from version control and then Create New Project->Android-> Create from existing sources.Usually it works OK.
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