I get the following error in eclipse: r cannot be resolved. However that appeared just after I added my own library as a resource to my project. It seems that eclipse cannot resolve which R to use, the library one or the project one. Note also that the library is marked with the is library check box in the project set-up. Also whenever I remove my library from the reference list eclipse does not show any errors, but upon compiling logCat shows a Class Not Found exception. How do I fix this issue?
Thanks
R is an autogenerated class. If you clean the project, the error should dissapear.
R.java is not getting generated for your project which is done automatically, pls check whether something wrong with any XML file or check console if there is any problem in XML it will show you something related to XML or check something wrong with importing packages. If its not about any XML errors then check on importing that library project in your project. you may get some imports related to something like this: com.android.R then remove this if you see this and then manage imports again.
Related
I had a problem with my android studio not creating the R.java file ( which its still not doing ) but ontop of that, im getting this error which I dont understand at all.
as well as this error
Please help.
This might java error.
check your java version you might need to update your java.
I have added the support library v7 to my project and I think it worked because ActionBarActivity is recognized (import android.support.v7.app.ActionBarActivity works).
The problem is that for all my R.ids the R is underlined with the message R cannot be resolved to a variable.
What am I doing wrong?
The problem is probably with R, not anything to do with the support library. Sometimes cleaning the project solves the problem.
A Google search with that message ("R cannot be resolved to a variable") returns tons of answers, try those. Also Stackoverflow is full of these:
"R cannot be resolved to a variable"?
Eclipse error: R cannot be resolved to a variable
Eclipse giving error, missing R.java file after recent update
If it's got nothing to do with that, then maybe you've got an error in some XML file.
I know this question is asked many times. But still that answers are not resolved my problem. My code shows an error "R cannot resolved to a variable in android". I cleaned and build automatically many times and also fix the project properties but the error still same. How can I resolve this error ?? please help me and thanks
look for the errors in res folder and resolve it first.
It can be an error in layout, drawable, values etc..
Check the last layout, drawable, values etc where you made changes prior to getting errors. You must have made an error there. It usually is using captial letters or - in drawables or import to "R" in your activity or some problems in xml like name match_parent to Match_parent etc. Here are some links with similar problems
Android Development- Where is my R.Java file?
R cannot be resolved - Android error
R cannot be resolved to a variable
R cannot be resolved to a variable -- mailing list entry
Fixed: R cannot be resolved to a variable
Try one of these.
1>Could be a problem in your xml
2>right click on the project->Android tools->Fix Project Properties (check if the build target is checked)
3>SDK update (Build tools would have not been downloaded) go to android sdk manager and download tools (to find out create a new project if it cannot resolve R then go ahead with this step.)
Hope this helps
Try to remove "import android.R ;" at the top of your code.
In my app, I am using Pull TO Refresh list view library. I had designed layouts for all screens respectively. When I ran lint on my project, in one of my layout file for xlarge screen, it gave me fatal error:
Class referenced in the layout file,
com.handmark.pulltorefresh.library.PullToRefreshListView, was not
found in the project or the libraries
While in same layout file for other screens, it is giving no error at all. Also, I had used same library in other layouts of my file, where it does not give any error. It is giving same error for Google Maps api as well. My project targets Google Api level 16 and I had checked, all libraries are added to it. But,the error doesn't go away even on cleaning project.
This is a lint bug and you can safely ignore it. Lint is meant to help, not to hinder your development time. Change the lint Errors to warnings and you can compile and run the app just fine. I don't recommend turning it off because it helps to keep your code cleaner.
Make a project Project -> Clean... this resets the bug errors for me.
I was also getting a similar error, for me, it was resolved by adding android.enableJetifier=true to gradle.properties.
You can suppress the lint error by, passing the error type to the ignore attribute within that view, for example:
<com.handmark.pulltorefresh.library.PullToRefreshListView
...
tools:ignore="MissingClass"
...
/>
Just make sure you have tools imported:
xmlns:tools="http://schemas.android.com/tools"
References:
https://googlesamples.github.io/android-custom-lint-rules/checks/MissingClass.md.html
It happened to me when i changed thé android studio IDE, To solve it:
-reate a new project;
-replace the content of dependencies in build.gradle of your project with the content of dependencies in build.gradle of the new project;
-sync project with gradle.
And it will work.
When I attempt to run my Android application I get the following message:
your project contains error(s), please fix them before running your application
All I did was to clean the application and everything went wrong.
Normally, you would see a red asterisk against the offending file and the corresponding line with the error. But in this case I get no such indication.
Screenshots:
Sounds like you have a syntax error in one of your XML files, or an invalid file name.
When you do a clean it deletes certain files, it would then automatically build, if you have syntax errors the R.java file won't be generated and you will have the above error.
you can check in android console(window->show view->console),it will give some more information,check it once,check your build path if your are import your project somewhere else and the project uses 3rd party libraries or you may have problems with your XML resources.
Found the source of my mysterious error.
It turns out it was a imported java class I had forgotten about which I wasn't using and caused the error to showup when I "cleaned" the project.
I visited the build path where I saw it had an associated error. I removed it and all was well.