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..
Related
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.
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 :
I am developing an Android App in which I use lot of JNI Code.. Recently (from last 2-3 days I am really annoyed by surprise behavior of eclipse) it shows me vague errors as soon as I open my .c file... However errors disappear if I close and reopen the project. See the secreen shot attached. Is it because I just update my eclipse installation (just update of eclipse plugins, I am still on my old Indigo)...
Is it an eclibse bug or something wrong with my setup ?
Solved ????
I tried everything but noting could change the behavior of eclipse.. By this time I knew that I have certainly messed with the project Settings by mistake, since eclipse was behaving well in other projects of same workspace. So I recreated the project manually and finally that solved myproblem...Though the Question is still open for valuable answers I think soon I will get some good answers..
UPDATE
Even eclipse 4.2 release also has this problem.. #frustrating
I found that deleting the project and than reimporting the project to workspace solves the problem. However I also came to knew that deleting .cproject file from the project tree can also fix this problem. Fixing the NDK path (Window -> Preferences -> Android-> NDK) in Eclipse preferences may also solve the problem.
Solution 2 Which may work in few cases...
Right click on the project.
Select Android Tools -> Fix Project Properties
This is my third time setting up my android env in eclipse (for different computers).
This time I cannot get it to work, something didnt get set up correctly or I'm forgetting something.
gen folder is not getting generated and of course no R.java file. I have searched online everywhere and cannot find a solution to this problem. That applies to creating a new project and using android sample projects.
No I do not have import android.R, restarted eclipse mult times, did clean project, build project, no new updates to be installed..
Thanks in advance, any help would be great!
This is usually due to a quirk in Eclipse. Often, but not always, it is solved by this magic invocation: Pressing ctrl+shift+O, then "Project Clean" (uncheck "Build automatically" first), then "Build All" and see if it works.
TRy closing and starting eclipse again.
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