I have updated my SDK and ADT to the latest version, I have also update the Eclipse to Kepler the latest one after Juno.
My ADT version is 22.0. After this update when I create a new project, I'm getting error, stating R cannot be resolved to a variable. I have imported import android.R;, but it is showing as unused import stating Don't include android.R here; use a fully qualified name for each usage instead.
Same thing is happening with Mac OS also with the latest update. I have tried renaming activity_main.xml to other name, but still my R.java is not generated.
Tried all the things which are possible. Cleaned the project, build the whole workspace. Nothing helping.
I think ADT or Eclipse compatibility is having problem after the update.
I have updated my whole SDK, here is the screenshot, but same problem is there.
After updating to SDK Tools to rev. 22 for the first time, you may need to relaunch Android SDK Manager again and install a new item: Android SDK Build-tools.
After installing this, clean your projects and rebuild.
Yesterday, I made an update with sdk manager, and I had the same problem as you. I fixed the issue: I have updated another time the android sdk (with the sdk manager tool), then I check update from eclipse for install the updated ADT plugin and I rebuid my project. "Android sdk Build-tools" from Android sdk manager is now rev 17 and now it is OK. I think the issue is from adt plugin from eclipse
import android.R - remove this statement from all your classes and then do a clean your R file will be generated. if this did not work then check all your xml files for any errors and then do a clean. These 2 are the most common reasons for R file to go missing
Changes in your Build target also can effect R.java in Eclipse so
Right Click Project >> Properties >> Android >> Select Latest(usually) Android API Platform >> Click OK
Hope this is helpful.
Follow These steps...
Right Click Your Project.
Select Properties->Android Check Project Build Target and API Level.
Again come back and open Android Sdk Manager Chekc the Tools and make sure you are installed Curresponding Android SDK Build Tools.
Eg : IF you selected api level 17 in properties you should install Android SDK Build Tools 17..
Try this:
make a backup of your projects on desktop
close eclipse
delete your workspace
restart eclipse and import your projects again.
I had same problem.. I solved by doing the following:
check all xml files and drawable files if there are any CAPITAL LETTERS in file name, if you have then change it to lower case, if you are using selector xml files then check the other files you are linking in those files..all should be lower case.
Go to java files which show error and remove IMPORT R.java file from imports list.
Go to Projects>>Clean.
This should fix the problem. This is how i fixed :)
My issue was that I had android:orientation misspelled in my activity_main.xml file and I was getting this error. I fixed the spelling and problem went away! So make sure activity_main.xml doesn't have any errors in it.
Sometimes when you extract your file it miss some part so better when its extracting make sure all file are extracting properly and then run eclipse after that run a simple file and install plugin of avd
it helped in my case
if the problem persists then try closing the other projects by
right click -> close Unrelated projects !
this worked in my case
For eclipse users:
Comment the lines including R.*
Clean and build.
R.java will be generated and then uncomment the R.* and rebuild.
the best solution for r.java missing for linux...
R.java is self generated in gen folder.. so better dont edit or create manually by urself ..
-open terminal(alt + ctrl + t)
-change directory to skd->tools
-then provide executive attribute to all executable file by(sudo chmod +x filename)
-do the same for files in sdk->platform tools .. (ie sudo chmod +x filename) ..
-----every executable file sud b provided with +x attribute...
just delete gen folder all of your error will be cleared
Proven successful method, check the file (AndroidManifest.xml) and delete all comments in it, and make sure there are no errors in this file, I tried and did work with me.
Related
I am facing a problem when I try to create new android project in eclipse adt plugin tools.
ERROR/EXCEPTION::
Errors occurred during the build.
Errors running builder 'Android Resource Manager' on project 'test'.
java.lang.NullPointerException
I have faced this problem two times previously. Only solution was to re-install Windows operating system which actually did solve the problem. But I want a real solution without re-installing Windows.
Switching to a new workspace worked for me.
File-> Switch Workspace.
found a better solution. in the create project wizard. don't create an activity in the wizard. just untick create an activity and just create the activity manually in the manifest.
I guess you upgrade your java to java7u55.
because I am using mac, but, FYI
I solve this by edit eclipse.ini, force the ide to use java 1.6
-vm
/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Commands/java
you could try the same.
In my case, the error was solved by changing the workspace folder permissions with chmod 777.
I am using Mac OS X and downloaded the ADT bundle for Mac.
If you close eclipse and then look in your system processes and still see adb running, then that's the problem - it crashed. In my case it was because I have extension files for other programs in my JRE that the adb doesn't seem to like. Remove all your ext files, force shut down your adb.exe and then restart eclipse.
Root exception:
java.lang.NoClassDefFoundError: org/apache/log4j/Priority
Usually this means that they have one more time introduced a bug.
The "magic passes" that may help or not help are:
Pressing F5 (refresh)
Updating Android, Eclipse and ADT (knowing that you do have such a problem, I myself definitely will not do any such updates in the near future)
Creating a project from the command line, building it and trying to import
If you have any project that already works, you may try to take files from that project.
Read the logs, they are usually more informative than just the last 30 lines, but on Windows you will have to either configure the screen buffer height to be about 300-600, or redirect the output to a file.
Clean and build again.
You usually get this after an SDK/ADT update.
Go to your SDK manager and ensure that there are no updates. Then in Eclipse go to Help > Check for Updates and install any updates it finds.
Restart eclipse and hopefully it should all work.
Failing that uninstall Eclipse and re-install Eclipse and the plugins again should fix it as well, no need to re-install your whole PC.
I use maven to build and integrate android projects with jenkins/netbeans. For editing android resources, I often use Eclipse because of the ADT plugin and better android resources support.
Eclipse (Kepler) has serious problems when you import maven-based android projects. It expects the project.properties file in the root folder and will NOT generate it on its own no matter what. Example content:
# this file is needed by eclipse (adt plugin).
# Project target.
target=Google Inc.:Google APIs x86:19
Additionally, create a sym link called "gen" pointing to target/generated-sources/r if using maven to build the android project on the command line. That way, you should be able to do "File->Import...->Existing Android Project". You get an error message, but it didn't matter in my case.
Additional hints in case you have problems with m2e-android plugin:
always check that the output folders for source dirs and resource dirs are correct.
check that source dirs are set as source dirs (you usually get a corresponding warning)
if resources from dependencies are not included in the final apk, check the filter settings for your resource dirs
you may need to "import maven project from existing sources" before importing it as android project from existing sources.
make sure dependencies are imported into the workspace and open and referenced (project props -> android -> add lib)
eclipse adt does not support aar libs, use apklib instead
It can happen if you are changing the location of files that your
eclipse project uses.
In that case you can copy the files directly to your resources folder inside the workspace instead of linking them with "import"
These simple steps put me out of this trouble -
In Eclipse, Help menu -> Check for Updates.
Select all Android related plugins.
Click Next, Accept the agreement page then proceed to install the
plugin.
Make sure your java path points to the java SDK bin directory.. make sure you have installed the latest JDK t be safe..
You can also try one of these:
Close and open the project in Eclipse
Click right on the project and choose: Android Tools -> Fix Project Properties
I beat my head against a wall for a day because of the same problem. My solution (OS X): I had a stale "java_home" definition in my profile pointing to a dead symlink, as well as old classes in /Library/Java/Extensions. I removed the definition and symlink, along with two classes in Extensions (ActiveMQ and Geronimo, FWIW) and the problem went away. Not sure which step was the actual "rectifier" but if any of those conditions apply, you might want to check them.
I faced same problem on my New Macbook Pro so I just Downloaded JDK and installed it and problem fixed.
I was experiencing the same issue - I refreshed and updated Eclipse and Android plugins and was still seeing the NPE. What worked for me was changing the order of operations.
In order:
1. update Eclipse & Android plugins
2. after the update has completed, perform the F5 Refresh in the current workspace
Make a copy of your project in Explorer/Finder. Delete the project in ADT/Eclipse. Import the project again using Eclipse. Project/Clean then build. This works for me.
I have tried every solution I found on the web and they did not work.Then I remember java version on my Mac was 1.7 and I have installed subversion version 1.6 and the problem occured after that installation.Also I have deleted eclipse and used a clean eclipse and Android sdk installation I still got the problem, then I uninstalled the JDK 7 as it is told in here http://docs.oracle.com/javase/7/docs/webnotes/install/mac/mac-jdk.html and my problem is solved.
I have several projects in my folder. Every time I start a new one I close the others. I got this error because appcompat_v7 was closed.
Right click on appcompat_v7 and select Open Project.
This solved my problem.
Solved after changing a setting in eclipse.ini. I am using OS X 10.11.4 and Eclipse Mars 4.5.2.
Go to the folder of Eclipse.app in Finder.
Right click to open a menu, and click Show Package Contents.
Go to /Contents/Eclipse.
Open eclipse.ini in your favorite text editor.
change -vm path like below:
BEFORE: /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home/jre/bin
AFTER: /Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/jre/bin
reopen Eclipse.
enjoy :D
I just installed Eclipse on my computer. And I make a blank Android project via its wizard step by step. That means this project should work fine after it is created. But it cannot and show error of "R cannot be resolved to a variable". And I found that the gen directory is empty and it won't generate anything new in this directory even that I try to Clean and select Build Automatically option already.
I download an existing Android project from my Github and it can work. But after I run Clean, it gave the same Error information and its gen directory is empty again.
Why and how to solve it? Thanks!
Make sure that you have installed the followings in Android SDK Manager
Android SDK Tools
Android SDK Platform-tools
Android SDK Build-tools
By clicking Window-> Android SDK Manager in Eclipse
Wait a bit to let it fetch the content and you will see if they are installed or not.
It is an error of Eclipse. Create a new Project, copy all the scr and res file to new Project.
It will work fine.
1- Check for errors, if there are just comment it. The idea is to build the project et reconstruct the /gen. After that you can uncomment in good order.
2- Use Clean/refresh/build as many as you need.
3- Sometimes eclipse needs to be restarted..
4- Try to reinstall your sdk tools
5- If nothing is working you should concider reinstalling your ADT if you are using the bundle. If you are using classique eclipse reinstall android sdk retry and if it's still not working reinstall eclipse too.
hope it helps
Most of the times the error comes from wrong formatting in the XML files, which Eclipse doesn't always detect.
Make sure to go through the XMLs and check for potential errors.
If all looks good, rebuild the project.
If that fails restart Eclipse.
If that also fails, as a last resort - copy your project somewhere, reinstall Eclipse and Android SDK tools and re-import your project.
After upgrading to Android ADT version 22 and cleaning my project, the R.java files went missing. I can't use setViewContent(R.layout.activity_main) because the activity cannot reference to the xml layout (due to the missing R.java). Also, when using the (ctrl + space) to get suggestions for setContentView, the code is not typed in. Upon looking at the error log, it shows that there was an "Unhandled event loop exception". The plug-in involved is the org.eclipse.ui.
Also, whenever I create a new Hello World project, the gen folder is empty.
After a few hours, I tried the android studio. But I didn't like it there. Then, when I went back to Eclipse, there was an update for SDK platform tools and build tools. I updated them but I still get the errors.
I tried cleaning the project but no luck. What seems to be the problem?
I had the same problem just solved it.
check:Java/Eclipse - No more R file ever
More info:https://groups.google.com/forum/?fromgroups=#!topic/android-developers/rCaeT3qckoE%5B1-25-false%5D
Update Android SDK Tools and Android SDK Platform-tools and Android SDK Build-tools from Android SDK Manager
Add abover dir to your ENV $PATH
Not enough credits (yet :-) ) to vote up or comment directly on Rany A. Ishak's answer, but after one day lost trying to fix these silly problems, I'm very confident I've found the right solution...I'm installing Android SDK Build-tools right now, I'll get back soon on this!
The solution for this is, open "Android SDK Manager". Download "Android SDK build tools". Then for safety, restart your eclipse. That's it. Back to normal. All apps start building.
Android SDK now has a special package: Build Tools. It was not present in earlier SDK versions, and seems like it MUST be installed in order to generate those R files. It is now the one package that does that stuff. (And probably everything else regarding building for Android). So, if you not have that installed (and you will likely not have if you just upgraded the SDK), it's like missing a compiler - you can't ever expect your code to be compiled if there is no compiler.
I had the same exact problem after updating to SDK 22. There seems to be an issue in the Android SDK update process that the process needed to run twice to update the SDK Tools completely. Make sure you check the SDK manager a few times by closing and re-opening the SDK manager (not Eclipse) to load the new updates. Then restart eclipse and check the SDK manager again. Make sure all items are updated. Then clean your projects and R.java will get created again.
In Eclipse, go to Project menu,there is an option build automatically, click it. That would help you build the R.java file everytime modifications are made in your project. The Clean option is also there under Project. It will help you.
I tried the following. Let the application name be "My First Application". Then the name of the package should be com.xx.myfirstapplication.yy. Make sure that you add a yy after the application name in the package field while creating the application. Hope it helps.
The Same problem happened to me also,
1.Check that Android SDK Build-tools is installed. Window->Android SDK Manager->Tools->Android SDK Build-tools
2.Make sure when you update the Android SDK Tools, you also update the Android SDK Platform-tools and Android ASK Build-tools. Build fails silently if they don't match.
Solution
1.Update Android SDK Tools and Android SDK Platform-tools and Android SDK Build-tools from Android SDK Manager (Window->Android SDK Manager->Tools->Android SDK Build-tools).Then restart the eclipse.
This is.... "Much ado about nothing"!!!
In my case there is error due to "&" inside strings.xml file(but error not shown) for declaring string for a array type. Now the problem has been solved as I changed "&" to "and".
So, please make sure that you do not have such silly use of symbols, and clean the project.
I had the same problem,
I just removed all the errors in my source files and xml files then R.java was generated.
My Eclipse out of the blue stopped building my Android so I removed the old version and have installed Indigo. When I try to import an Android project in I get this error:
Errors occurred during the build.
Errors running builder 'Android Resource Manager' on project 'ACCUWX_HoneyComb'.
java.lang.NullPointerException
Errors running builder 'Android Pre Compiler' on project 'ACCUWX_HoneyComb'.
java.lang.NullPointerException
Errors running builder 'Java Builder' on project 'ACCUWX_HoneyComb'.
java.lang.NullPointerException
Please help!
Try removing the .metadata folder from your workspace. This holds all your configurations, even after a new install. I think if you just delete this folder, assuming everything is in place, you should be up and running again.
The 21.0.1 version of the Eclipse ADT tools has a bug that prevents a project building if you have any files without extensions in them. This is a particular problem for users (like me) using subversion which has extenion-less files.
The solution is to install the 21.1 preview version of the ADT tools and SDK manager from Google. Clear instructions can be found here and you can read all the background add your voice to the angry mob of developers here.
This happened to me today with ADT v21.0.1-543035 and it turned out to be the .svn directories throughout the directory structure. See http://code.google.com/p/android/issues/detail?id=42051
Worked around the issue by upgrading svn client and working copy to 1.7.
For me, the source of the NullPointerException problem was a host-side Junit test project that references (and tests) code from an Android project. It didn't have a project.properties file. It's not an Android project, but for some reason the newer version of the SDK somehow expects the file there. To fix the problem, I just copied a project.properties file from an Android project to the host unit test project.
I had something similar. The problem was created by having some files without extension inside the /src folder.
In my case, a branch tool, changed the encode of the file project.properties, I changed the encode to Windows-1265 and the problem was solved.
I had the same issue and fixed it by following comment number 6 in this page:
Issue 42051: Subversion folder causes NPE in PreCompilerBuilder
Let me quote the comment:
Solved it by installing subversion support packages for eclipse:
http://gan.so/VgYT
It's still a bug but...
same problem here, I closed Eclipse, manually removed any files in folder gen for the project, started Eclipse again, and made a build.
For also me, the source of the NullPointerException problem was a host-side Junit test project that references (and tests) code from an Android project. It didn't have a project.properties file. I added it and problem got fixed.
I found the solution on this website(https://code.google.com/p/android/issues/detail?id=68755)
So basically, what we should do is :
Bring up $ADT_DIR/eclipse/Eclipse.app/Contents/MacOS/eclipse.ini in an editor. Before the -vmargs line, insert these two lines:
-vm
/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Commands/java
you can find the eclipse.ini following this
(On a Mac OS X system, you can find eclipse.ini by right-clicking (or Ctrl+click) on the Eclipse executable in Finder, choose Show Package Contents, and then locate eclipse.ini in the MacOS folder under Contents)
Upgrades did not work for me (on Linux), so I just installed IntelliJ Idea (build 123.155). Had to modify idea.sh to set JDK_HOME=/usr/lib/jvm/jdk1.7.0 (the Oracle JDK) and to select [menu] -- Run -- Run... -- Edit Configurations... -- Target Device -- USB device to make it work with the real device.
I'm starting to learn Android in Eclipse. But every time I try to create a project the gen folder is empty. So I don't get the R file(or whatever else is in that folder, if anything). Clean does NOT work. There was never an R to begin with. Do I need to download something to make it generate it?
had the same problem. Check in the Android sdk manager, tools and check if you have installed android sdk build-tools. had the same problem because i hadn't installed it.
I had this problem because I had two projects in the same folder and one was the library of the other. Then Eclipse built the projects in the wrong order. What I did to fix this was close the non-library project and then open it again (after the built of the library project), which made it work.
None of the solutions posted here worked for me: Clean, changing options, build errors, etc. The problem was caused by importing the Android project as a normal project, i.e. using:
Import > General > Existing Projects Into Workspace
instead of using
Import > Android > Existing Android Code Into Workspace
One of those
Getting rid of 'import android.R' line.
Cleaning the project and then building it again.
Closing project and then opening it again.
may help.
May be your problem was related to incorrect target build settings.For example if you use an element in your layout that is available in greater Android targets.You can see more details here.
STRUGGLING FROM THIS BUG FROM LAST TWO DAYS. FINALLY SOLVED IT :)
The best way to get rid of this is to go to WINDOWS option on the tool bar -> ANDROID SDK MANAGER -> and tick TOOLS option on the top tools bar (i.e. all all android sdk tools , android sdk platform tools , android sdk build-tools.) and install.
After updating all these too latest versions , go to HELP and hit CHECK FOR UPDATES and install all these new version plugins.
Last step is to go to PROJECT option in the tool bar and uncheck the BUILT AUTOMATICALLY option and go to CLEAN and perform clean on required or on all projects.
I know this method might consume some of your net mb's but will definitely solve your problem.
E.njoy...:)
I ran into the same problem. I had incorrectly set the path of the Android SDK. Setting the path in Windows -> Preferences -> Android did the trick for me.
I had the same problem. Just add these two line in your project.properties file
target=android-19
android.library.reference.1=../appcompat_v7
I happened to have the same problem, solved by "Right click on your project and then click Build Project".
Try this,
Right click your project
Select properties.
Select Java Build Path
Click add Folder
Select the gen folder
Click OK.