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.
Related
After reinstalling my Android Studio I have big issues because all my projects have problem with Gradle file.
There are .jpeg-s attached
Gradle File
Messages Gradle Sync
[Some conflicts in installation area][3]
I would suggest fresh new install of everything and keep in mind where exactly will you install it (my suggestion would be to keep it simple like C:\Android\ for studio and C:\Android\SDK for SDK
Also you can click on Edit next to the SDK location and see what if your SDK report any issues or you can select another SDK location and update missing tools from there.
Or if you would like to tackle current issue on another way, use search and find SDK folder and move it your android folder (don't forget to avoid black space in file path), and again through SDK location don't forget to put new path to the Studio.
After you set up your environment ans run your build gradle again there shouldn't be any more issues like this, or at least when you install missing platforms and tools it will fix thing as it should.
Also have the same dependency version for libraries when you finish setting up environment.
Finally done. I resolved uninstalling Android Studio. The real problem was SDK. When you uninstalling AS SDK is still on computer, and I deleted all these files from SDK folder. The best option if you install AS and SDK directly on C:. After that AS working without any problems. Thanks #Miroslav for all your help and patience.
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.
Today, I update ADT to 22.0.1.v201305230001--685705, and found that Eclipse stopped generating R.java. I believed that it is problem of Eclipse, because I create a whole new clean android project, and I cannot even run it as android application. I cannot find any files under gen folder.
The version of Eclipse is 4.2.2, is there any way to solve it?
I try to use Eclipse 4.3 with the latest version ADT, but the problem is still there.
I had the same problem.
Open up the android SDK Manager, and install the new android build tools. Without this you will no longer be able to build anything.
For some reason they have seperated them, and a lot of people are not noticing.
Try deleting bin folder and clean the project..and In Eclipse, under the Project menu, is an option build automatically. That would help you build the R.java file everytime modifications are made. The Clean... option is also there under Project It seems to be a common issue with many different answers
Update android-sdk, I think sdk need Android SDK Build-tools. For update it follow some steps--
Go to Window->Android SDK Manager.
Update and Install all tools (Android SDK Tools, Android SDK Platform-tools,Android SDK Build-tools) which are in Tools folder.
Check the xml files of your layout whether they are properly saved with no error or not.
I have faced similar problem that suddenly R.java is disappeared and eclipse could not regenerate it after building SDK. I checked SDK manager and saw that Android SDK build tool is perfectly installed. Finally, I have noticed that there are some errors in xml files. After fixing and saving those, R.java generated automatically in my case.
Whenever i am trying to run my project, i am getting this error in the console.
"Could not find **.apk"
Operating system: windows XP
IDE: Eclipse SDK
Version: 3.4.2
Build id: M20090211-1700
Android: 1.6
ADT: ADT 10.0.0
FYI: it is only happening with a single project, other projects are running fine..
I think this can happen when you rename the library project out from underneath the dependent project. Eclipse is reasonably good about about updating dependencies in most cases but this one seems fragile.
First try removing and then re-adding your library in Project > Properties > Android > Library.
If that doesn't work try cleaning your projects, exiting Eclipse, and opening the ".classpath" file in your project's root directory. If you see a line that references your library project under a previous name, just delete it, save the file, and relaunch Eclipse. Build the library project and then your dependent one. You may need to re-add the library like I mentioned above. This is what worked for me at least.
Edit note: I also found some stale references in my .project files. They didn't seem to be causing any problems but I removed them too. If you do that, be sure to search for the old name in that file as there was a whole "link" section near the bottom that also referenced it.
Make sure after updating your android sdk sdk build tools are updated properly.
You can check it by Open sdk manager -"Android Sdk Build Tools" status must be installed.
if the status is not installed then install Android Sdk Build Tools for the same.
restart your eclipse and try again
check this it might be helpful to you
Make sure your project imported the Android 1.6 library correctly. That is, under your project, you should see 'Android 1.6', which expands and displays 'android.jar'.
If it says Referenced Libraries > android.jar, you will need to fix this by manually altering the .classpath for the project.
Open .classpath for the project and type the following:
The important line is the 3rd classpathentry, which is the actual link to the Android SDK libraries.
source
clean your project and check . eclipse is not building apk file.
check this thread. It might help you.
http://groups.google.com/group/android-developers/browse_thread/thread/2c3e45540b915945/f06e10bcda3ad68b?lnk=raot&pli=1
Run eclipse as administrator and then import your project
Update Android SDK, is what did it for me.
I was building a game with the LibGdx Framework and got the same error. I tried several solutions from various posts at stackoverflow and others.
Found help in a post at the LibGdx Forum:
http://www.badlogicgames.com/wordpress/?p=3010 Posted by Mario, on May 18, 2013
Just updated to ADT 22, so should you. However, the process wasn’t all that smooth. What you need to do:
Update the ADT plugin in Eclipse (Help -> Check for Updates)
Open the Android SDK Manager, either from within Eclipse, or from
your Android SDK folder
Fetch all the updates
Fetch all the updates again
Fetch the updates one more time…
The end result should be an updated ADT plugin, as well as up to date SDK packages. Make sure you have all three of the ones in the following image, with the exact version numbers.
I needed to update them only once and from there on it worked.
Even if this post is outdated I figured I'll share this, because I lost a day finding nothing.
I experienced that problem, too, when I created an android project that was using an android library. Obviously I didn't know how to incorporate a library into an application the right way. I wrongly used project dependencies (Java Build Path/projects) or adding a library (Java Build Path/Libraries). While all I had to do was go to the Android tab and import my android library by means of the add button from the Library section.
I am using PhoneGap and I checked several solutions about configuration (properties, build path). However, my problem was that I tried to run everything with the default setup for Eclipse. Then, I solved it going to the SDK manager to install: Android SDK Build-tools, and it worked.
Mine was caused by this problem (incompatibility between ADT and SDK), and was fixed thus:
Eclipse > Help
Install New Software
Add 'https://dl-ssl.google.com/android/eclipse/' to 'Work With'
section and press enter
After developer tools appears on the list, check it and click Next
Restart eclipse once download is finished
Make sure put correct SDK Location (I have 2 instances of SDK and update wrong once).
I'm trying to run the sources from the Android SDK but most of them contains errors and they are not working. I have tried to clean them (eclipse->project->clean) or refresh with F5 but they still contain errors. Do you have any idea what's the matter with these "ready" examples?
I think you forgot to set the path to the newly downloaded Android SDK, go to Preferences > Android and set the SDK Location. Check out this helpful guide for more reference
You may need to install API's of the correct version.
Open the SDK manager and install the needed API versions which are missing.
Reopen the development environment, Eclipse, and update Android development if needed.
Then clean the project and if needed rebuild the sample project. The errors should go away.