I'm trying to learn to develop Android applications and I'm using eclipse, I Installed the android SDK and eclipse and I was able to make a couple of basic examples but suddenly I updated the SDK with the lates reviews and eclipse is not generating the R.java anymore, I read a lot of forums with the same problem but all responses are releated with errors one the code and errors on the xml's but I just create a new project with all defaults and not touching any line or any configuration and I don't have the R.java so I can't run the project I've clean the project 100 times and I reinstalled everything a couple of times but nothing works, so totally frustrate, I change from my Windows 8 PC to my MAC and I found exactly the same problem. Does anyone have a suggestion?
Thanks
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I know there are a multitude of questions across various forums that touch on this issue but nothing has helped thus far.
I use Eclipse Photon for my IDE.
I installed the Android SDK via Android Studio.
I recently moved to a new machine and since then I get these errors when trying to build the project. Actually, the first image occurs when I first open Eclipse. The second image is what I see when building (I cleaned beforehand).
Many solutions suggest reinstalling platform tools/build tools/the entire SDK etc.
So, I did this:
1) Closed down Eclipse
2) Opened Android Studio and went to SDK Manager
3) Unchecked and uninstalled all the options highlighted in the images below.
4) Once uninstalled I restart Android Studio and reinstalled all of them.
5) The errors noted at the start of this post persist.
Any ideas what I can try next? It seems every machine move/upgrade causes build issues. It's the main reason I dislike coding for phones, it's not the coding, it's the dev environments!
I've just updated Android Studio to 0.2.7 and my Project view (Alt+1) has gone strange.
That's all I get showing up there. I've tried restarting the IDE but it's still the same.
Anyone got any ideas what's happened?
EDIT: I've reverted to a Backup of my project from a few days ago and just copied in my java and res folder, and it seems to be working fine, but I'm still curious as to what happened in my original project
I made a new project and copied in the files.
This seems to be the "go to" fix for and Android Studio projects after it updates for me :p.
I'm developing an android application and I've gotten pretty far already.
but recently I opened my eclipse again to continue my work, but there was a problem with my settings for the google play services. (I'm kinda sure it happened after I installed the new version (revision 7) from the android SDK manager.)
So I imported the google-play-services_lib and the google-play-services.jar again and the errors went away, so far so good I thought.
But now eclipse can't resolve R to a type and I can't run the app either...
I've searching the whole day to save my project from these errors and now I'm getting this one...
btw the project ran perfectly for 4 months...
can anyone tell me wat to do?
EDIT:
what I tried so far:
I've added all android build tools, google play services (libraries and projects),... Imported the google play services project into workspace and cleaned the project like 30 times. I Already checked private libraries, android dependencies etc. to export
I had the same problem I think.
In /gen there was no R.java for me but when I updated my SDK-Tools everything was fine since they seem to have changed the order in the last version.
Try that maybe!
Found it:
the SDK was already updated, but the device settings were changed somehow (now it was compiling for android 4.2.2 instead of 4.0.3) and when I cleaned the project, it updated some code I didn't notice, when setting the 4.0.3 build target again it wouldn't compile nor generate the R.java file (giving me loads of errors).
So what I did was change the project build target to 4.0.3 again, but I must have missed some lines of code that were updated to the 4.2.2 target... (leading to the R file not being generated, leading to more errors that were leading to more errors... just a vicious circle)
I didn't exactly remember what line caused the error, I was too happy it was solved I guess :)
Although I know this question has been asked a million times, I have tried going through many of the stackoverflow questions and none of the answers have worked.
I have an old version of my project that I know worked and built correctly, which I added back into my eclipse workspace. When I clean and build the project, I am given with errors with the R cannot be resolved..
What I've tried:
- Building/Cleaning project
- Was going to clear the gen folder, BUT R.java didn't even exist in there
- Checking through my XML files to ensure there's no errors
- Restarting Eclipse
Extra note:
- My ADT plugin and Android SDK was the LAST version directly after Google released it's updates to merge everything over to Android Studio.
I just solved this problem for myself. I was using the Eclipse Android SDK on Windows 7. The problem was that the Eclipse program did not have permission to create the R file. To fix it I went to "User Account Control" settings in the Windows Control panel and lowered the slider to a lower security level. After rebooting the computer and cleaning the application in Eclipse Android SDK there were no more errors.
I've experienced the same problem a week ago. After installing the beta version of android studio I was unable to run android projects in eclipse. Uninstalling android studio fixed all the "R cannot be resolved to.." errors.
After trying everything I tried one last thing.. which was to update all of my plugins and libraries for Android. This actually solved the issue. I'm sure not that many people will probably have my specific issue since it will eventually go away, but it is a different problem I have not found and a different solution I have also not found...
I faced Simmilar problem, i cleaned project, Restarted Eclipse, and many other things like remove errors from problems,
but it was DUE TO: an Image Name in Drawable it contained Capital Latter i did Re factor -->Rename and Problem solved..
I am a new Android developer (4 weeks into porting my iPhone app to Android). I have 8 projects (the app, and 6 small UI experiments, and a vanilla Hello World project that I just created with Eclipse). All fail to compile, and the issue is that every reference to the generated file R is flagged as "R cannot be resolved to a variable".
Up until yesterday afternoon -- every project compiled and ran (albeit very slowly) in the Android emulator. I've changed something, and since yesterday, all projects fail to compile, all in the exact same manner "R cannot be resolved to a variable". I every case, the generated files are missing. I believe they disappeared as I tried to clean and rebuild each project in the course of debugging this problem.
Two things that I know changed when this problem started, but that I can't say caused the problem, were: 1) shifting to debugging on a real Android device (a Samsung Galaxy Tab 2, which worked like a champ after struggling with the slow emulators), and 2) allowing Android (and perhaps Eclipse) to update themselves from the web.
I've spent many hours trying other user's suggestions and none have helped. Most suggestions refer to file naming issues, xml syntax errors, but I haven't changed these files and filenames since compilation was working. I have tried:
cleaning and rebuilding the projects
checking for subsequent updates to the Android SDK (and there were 2 subsequent ones)
Eclipse->File->Android Tools->Fix Project Properties
making small source changes to force rebuilding
rebooting Eclipse, as well as the Mac host, adb, the emulator, the Android SDK Manager
deleting a project, restarting Eclipse, and adding the project back in (bad idea - this fails with an error "Failed to load properties file for project 'ListViewFragmentTest'"
creating a brand new Android App project, which has worked many times before, but now fails
There's something going systematically wrong, and while I won't claim all these projects are bug-free, they did run up until 6pm yesterday, and then all stopped compiling thereafter.
I wonder if anyone has other suggestions, before I embarking with a complete reinstall of the development environment?
My environment is:
Macbook Pro (OS X 10.7.5, 8GB RAM, 2.53GHx Core i5)
Eclipse (Indigo Service Release 2, Build: 20120216-1857) (too old?)
Android SDK Manager Rev 22
Android SDK Tools (22), Platform Tools (17), Build Tools (17)
API's 11-17, all up-to-date
Seems like lots of people experience trouble with missing generated files (R), and I have had trouble when I've had layout XML errors as well, but that doesn't seem to be causing this problem. Thanks in advance for your help!
I am not sure but you are facing issue of R.java file is not getting generated after updated with ADT rev 22.
If this is the case then here is the solution:
Hope you know Android studio has gradle building tool. Same as in eclipse they have given new component in the Tools folder called Android SDK Build-tools that needs to be installed. Open the Android SDK Manager, select the newly added build tools, install it, restart the SDK Manager after the update.
Check in the Java build path library, whether "src" check box is checked or not.
If you are using any additional Libraries then make sure libs/android-support-v4.jar is same for project as well as the Libraries.
Thanks everyone. None of these suggestions resolved my problem. And while I'm curious as to why it happened, I was more impatient with not making any progress. I've reloaded Eclipse and the Android tools (this time with the bundled version from developer.android.com), and everything is working smoothly again.