I am using ADT bundle for my Android Application Development
1) From last two days whenever I open my ADT bundle its showing error in all the projects (But I have no errors in my projects and I am sure about it). I tried to clean all the projects but no use... Sometime a restarting eclipse will solve this problem but after few days I am getting this same errors again.
2) Also In my Android SDK Manager some packages like Google API and system images in extras were broken, I don't know what to do.
I tried to clean my projects and to update the SDK manager but nothing solved my problem. Kindly tell a better solution to solve this problem. And tell me why these kind of errors are happening.
Thanks a lot in advance.
But for this kind of problems need more clarifications. Here is my few tips to resolve it. It may or may not work! But better give a try.
In each class or java file which place exactly it showing the error? For example for few it will sow error in R. file and the error will be R cannot be resolved into type. If you are getting this error try to import you package R. file (Like import com.example.R) will resolve issue. If you couldn't import then try to check the package name in manifest file and other layout files. Try to resolve all errors one by one in res folder then clean will help it.
Next check whether Eclipse issue or ADT issue. You said few things are broken in ADT i don't know what exactly it means but try to uninstall and re-install them again.
Try to update eclipse. You can do it by Help->Check for updates
If nothing helps follow the error which are displayed in Problems tab which present near console tab. Otherwise open it here Windows->Show View -> Problems.
Hope anyone will help you if not please follow the errors and edit your question with error. So you might get better answers!
I had the same trouble.
I completely remove Eclipse and SDK bundle; then, i re-install everything.
This worked for me.
Do check this, Lint Error Checking will slow your ADT also seems to be occur error like what you got in a often situation..
so Disable lint from Windows-> Preferences -> Android-> Lint Error Checking, Under
Uncheck the two option in right hand side.
Be aware of what all your projects have JDK compliance.. set common JDK level.. mostly 1.6 based on need change to 1.7 for all projects..
set JDk compliance level in properties of your project -> java compiler and select in right hand side..
Always Check when importing any projects after import if its came up with a compatibility library or external library to be added like appcompat_v7
Check in properties of project under android tab in library section if there is any missing files..
From all the above suggestions are not fulfilled your problem, then go ahead with a new fresh latest ADT Bundle with a fresh download of platforms of SDK.. it will solve most of the ADT problems..
Finally the problem solved
This problem occurred due to missing target SDK in project properties and because of the broken files in SDK manager.
What I did is:
1) I deleted all the broken images and Google api packages from the SDK manager and I re installed all the packages again,
2) Then I selected android 4.2 as the Android Build Target in the project properties.
Thanks all for the time and help.
Related
I'm trying to learn how to develop an Android App from scratch using Eclipse, but I keep running into the "R cannot be resolved into a variable" error. I tried everything from completely removing Eclipse and downloading it again, to deleting my project and workspace and starting over, but I just cannot get away from this error. The thing is, it's coming up without me even doing anything. I just start a new Android project and it opens with this error so I can't move forward in learning this stuff.
Any ideas on what I can do? Keep in mind I'm at the absolute beginning of learning how to work with Eclipse, so if you have a possible solution, I'd really appreciate a step-by-step answer.
Thank you!
EDIT: As it turns out, I didn't have any of the build-tools installed. I remember installing them but I have no idea what happened and they were just not listed as installed. After re-installing, I'm good to go. Thanks for the help everyone!
Right click on your project and clean it, if there are any errors it will prompt you or else the R.java file will be created in your gen folder and imported in your project.
If there is any problem with the xml file in android, then R.java won't be generated. Please make sure that you don't have any error in xml file, then clean the project by clicking clean button in "Project" option and click "Build Project", Build Automatically is not selected. This should solve your problem. Best of luck.
You have updated the android sdk but not updated the adt to match with it.
You can update the adt from here
You might need to update the software source for your adt update
Go to eclipse > help > Check for updates.
It should list the latest update of adt. If it is not working try this
go to eclipse > help > Install new software
Click on add
add this url : https://dl-ssl.google.com/android/eclipse/
give it any name.
It will list the updates available- which should ideally be adt 20.xx
Eclipse will restart and hopefully everything should work fine for you.
Try to fix all error in your XML file. Look drawable, layout and other res folders closely for any error.
If it does not fix your problem then try
THIS answer :
Hi can anybody help me with the Eclipse SDK. I have cleaned my Android project then suddenly all of my Java class is in red and I can't build it, all of the references like the
the R has a red mark in it and before I cleaned it, the R was in blue. It always does this when I clean the project and sometimes build it.
setContentView(R.layout.id);
I tried to delete the gen folder then clean it again with the auto build uncheck then build it again then clean it again.
I also tried closing the Eclipse SDK and then opening and cleaning it again but to no avail.
I tried everything with this one can anybody help me? and thanks! Also can anybody recommend a good SDK for making android projects because Eclipse really sucks and thanks again!
If everything was fine before the clean, then the errors may happen because the generated classes (R, that is) has not yet been generated but eclipse already started to validate your classes.
You probably need to refresh after a little bit, or, if you set eclipse to auto-build sources, just wait a bit longer. Repeated 'refresh' (F5) often help also in this case.
As for alternative IDE: You could try android studio or the intellij IDEA community edition.
Hey add this in your imports and check if it works...
import yourPackage.R;
Update :
1) Go to your sdk manager.
2) If there is a build tools update or install then please update or install it.
3) Restart the eclipse..
4) Enjoy.........
When you clean, you'll get errors on everything referencing R as it doesn't exist. It needs to be rebuilt by Eclipse (in the Project meun, there should be an option for "Build Automatically"). Just give it a couple of minutes after cleaning and it should resolve itself.
(You can follow the progress in the bottom right corner of Eclipse "Building workspace...")
delete the imported R file and try again..
The title says most, but I have created a new project in Eclipse. I have everything set up, and as soon as I create a new Android Application Project, once everything has Generated there are 2 Errors: both "R cannot be resolved to a Variable", on Line 19 and Line 12. In the Video Tutorial Series I am watching it says there should be a file called R.java in the gen folder, but there isn't, just an empty folder. The Android project is completely new. Here are some of the things I have tried after googling, none solved the Issue:
Clean Project
Uncheck/Re-Check Build Automatically
Build Project
Close/Open Project
Check XML files for Errors - only the Two Errors as mentioned above in the Error Log
add "import android.R.*"
Create R file manually (Add -> Class)
It is my first time writing an app in eclipse, I know there are a lot of questions like this but none seem to solve my problem. The Java Errors (R not resolved to a variable) Errors are the only errors, no errors in the XML or Anything.
So that you can check my project, I have put it in my Dropbox if you want to have a look at it in eclipse.
Project Download Link
You can create the new Project and then copy the contents of this project into the new one.
This problem is with Eclipse. I recommend you to use Android Studio.
What might help, would be to create a new project and transfer the current project to that one. When the R file is not created when creating a new project, try and re-download the development tools and sdk.
I'm sure that the problem may be with your ADT tools in eclipse. Sometimes, this errors may occur due to some installation mistakes or some sort of software cracking problems. I also faced the same problem at my starting stage. The best thing that you can do is to move on with re-installation of ADT in you eclipse. It may help you. Try this!! Create you new Android Project and Enjoy buddy !!
I was having this exact problem, and found the solution after much headache.
In eclipse, find and click the button labelled Android SDK Manager (next to save, and all that jazz on the toolbar).
In the manager, make sure that under the "Tools" folder all of the relevant "Android SDK Build-tools" have been installed. Once they are, restart eclipse, and your R.java file should be generated. Hope that helps!
I know there are some sort-of duplicates of this, but none of the answers have been able to help me so far.
In a project shared with some friends over SVN, I always get the following error:
Unable to resolve target 'android-10'
When I change project.properties to alter the target version, the error message will remain, unless I use android-16.
I have checked my project's Android sessions to see if I could change the target there, but it only gives me 16 and 17 as options.
In my SDK Manager, I have the entire "SDK 10" branch installed, as well as several others.
Does anybody know what may be the problem here?
Another method is not use the same SDK, but use the SDK in your computer.
Right click project and select Android ,check target name, click 'apply' and 'ok'.
Then Right click project -> Android Tools -> Fix Project Properties.
Clean and build the project.
This answer is way too late but for anyone experiencing the same problem, try installing API 10 from the SDK Manager. Then run everything as you did before.
Or if you're on a Windows OS, this might also help: http://sagistech.blogspot.ca/2010/05/android-sdk-error-unable-to-resolve.html
If you're not getting android-10 as an option in the properties view, then clearly there is something wrong with your installation.
Well, the obvious thing to do is to doublecheck that the SDK location in Window >> Preferences >> Android is set up correctly and pointing to the right installation of the ADT. If so, the view in preferences should also include SDK10 as one of the installed platforms (in which case, there really shouldn't be any problem).
If it doesn't, something has gone wrong - either in Eclipse or the ADT installation. I would check - just to be sure - that you have the right Java SDK - I've had problems with Eclipse/ADT myself when this is the case.
If those two things seem in order, though, the best advice I can give is to reinstall eclipse and the ADT both. If you only use the installation for Android, then I'd suggest using the "official" Google Eclipse package from developers.android.com.
Unless you have a lot of stuff set up in your eclipse environment that would be pain to change, I wouldn't recommend spending time on trying to identify whatever variable is messed up (speaking from painful experience here ;) ).
While importing project tick the checkbox "Copy Project into workspace" after selecting projct. Hope this help you, as this option fixed for me.
I am getting an error in my Problems tab for my Android Project in Eclipse. The error is "Android Packaging Problem" with an Unknown location.
Unknown Error NullPointerException
I cannot determine what this problem is. My project was working a few hours ago. The only change I made was to add a public interface ITrackDao to my project and implement it. There are no errors associated with this.
I am not even sure where to begin to look. I cannot launch the application. Can someone give me an idea on what area I can look into?
Thanks
Peter
I was confronted with this problem too, and I solve it by clicking Menu->Project->Clean. The error goes away after cleaning the project.
I had a similar error - but instead of a NullPointerException it was an InvalidoperationException from somewhere in Eclipse.
A Project > Clean solved that one too.
Cleaning the project was not enough for me. I had to first remove a <classpathentry/> that specified the interface from the .classpath file and a <linkedResources>'s <link> to the same interface in the .project file before cleaning the project would remove the error.
I had the same problem. I tried the clean up option but for some reason it still did not work. I copied my project and pasted it as a new project and that cleared it up for me.
I had this same error in an imported project and cleaning was not helpful, however by deleting the library references in the .project and .classpath eclipse files, and then relinking things and cleaning, I was able to get things building again.
First I should recommend that you start using subversion or other versioning on your apps, that way you can pinpoint every change between each iteration. If your project was in subversion you could compare with previous and then pinpoint what changed.
With that said, I would also check through any recently changed layout XML, make a change and hit save and make sure you don't get errors. I've experienced strange null pointer/errors in Eclipse at times when my layout was fine, and by making a change and saving, the errors go away.
I ran into the same problem coz of my blackberry sdk installation. I think it messed up my eclipse 3.6.2 install . I just reinstalled eclipse and it all worked like a charm
I worked with a SVN project and one installation have eclipse Galileo. The other have updated to Helios.
In Helios I found this problem and clean is no solution.
After Galileo reinstall (all installations equals now), I deleted workspace and a new checkout resolved the problem.
I had the same problem. I tried the clean up option but for some reason it still did not work. I solved this problem using this step
Project name ->Android tool ->Add support Library