I just imported the Android tutorial solution Notepadv3. I wanted to see it run.
As usual, I'm greeted with the inability to resolve R.
I searched for an import R line and see none.
I edited a line and saved. I closed and opened the application.
What do I do??
This seems to happen on every project.
(I have tried this with Eclipse Ganymede under Ubuntu 9.1 and Eclipse Helios under Windows 7.)
I searched for an import R line and see none.
R.java will be generated in the same package that is declared in the manifest. Usually, your code resides in that same package, and therefore a manual import of R is not needed.
What do I do??
R.java will be created as part of the build process, in your project's gen/ directory.
If you have automatic builds enabled, and R.java is not being built, check your Eclipse console for error messages, such as bad or missing resources.
If you do not have automatic builds enabled, do a build.
Every now and then, you will need to do a Project|Clean to clear out erroneous errors and force Eclipse and Android to rebuild your project from scratch.
In addition to what #CommonsWare said, if after you do a Project > Clean and R is still not resolved, make sure you are importing your project's R.java and not android.R.*.
check for errors in .xml files.Build may be failing because of these.
Related
A few days ago, I accepted a contract from a returning client to make a few changes to his Android app over the course of the next few weeks. After getting the project source code from Github, I imported it into Android Studio (3.2) and noticed an error that I usually see pretty frequently but only for a short time during a Gradle sync: error: package R does not exist. Naturally, I shrugged my shoulders and ran 'Clean Project' and then 'Make Project.'
Nothing changed
Did a quick Google search and tried every 'solution' I could find. I tried every combination of "Make Project", "Make Module", "Clean Project", "Rebuild Project", "Sync Project with Gradle Files", "Sync with File System", "Invalidate Caches/Restart" imaginable. I restarted my laptop, updated SDK files, updated build tools, singled out each and every Gradle 'Implementation' line, and finally ended up uninstalling/reinstalling Android Studio as well as deleting all my IDE preferences just in case.
Still nothing
Next, I created a new project and noticed that the generated setContentView() line had the same error referencing the generated layout file. Wait. An untouched new project is having the same error?!? I went ahead and pressed 'run' and the project compiled without any errors contrary to what the real-time inspections are saying.
Switching back over to the original imported project, I tried running it and the compiler gives the same R package error. WHY?!?! There aren't any other errors, Android Lint runs cleanly, my Gradle implementations are recognized in the files, package names are all correct, and my AndroidManifest.xml file is perfectly fine.
If you need to see my build.gradle files, AndoridManifest, or anything else, comment and let me know.
Any ideas?
EDIT
Not a duplicate because as I mentioned, I've tried all of those solutions and none worked. I explained what I've tried, and why it's a unique situation.
Compare the contents of your build folder to mine and you should notice the difference:
Notice that the R folder in the upper image is marked differently? That's a working one. The lower image shows the broken project. These were taken moments apart.
So it turns out this painfully specific undocumented error had to do with having multiple build flavors all with different google-services.json files. In one of them, the package name was incorrect but because it was in a different source directory, Android Lint didn't have any context for which to compare the package name against and the R.java file wasn't being generated because there was technically an error when Gradle Sync was running.
I discovered this after many hours of tearing through the source files and re-constructing the project one file at a time in an empty project. There's nothing like the feeling you get when you finally resolve an error you've been struggling against for days!!
I can cause a similar error to occur if I edit AndroidManifest.xml to have a different package name than my source structure:
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.stackoverflow.garbage">
All of my code inside the com.example.stackoverflow package gives me the "package R does not exist" error. That's because these files don't import R.java, since normally the generated R.java file would be in the same package as these files. But it's not: it's in a com.example.stackoverflow.garbage package.
I can solve the problem by adding imports. But I can also solve the problem by changing my manifest's package attribute back to what I expect.
I am working on one android application. Don't know why but i am not able to regenerate R.java file.
i also searched a lot about it. and also tried all the solutions i got from various place. but R.java is not generated.
if i import my project in another computer, then it is working fine. only have problem in my eclipse. :(
i also solved all the lint errors, warnings and also tried to clean and build project. i also checked my all .xml files as well as all images. all is perfect not any special symbols or uppercase. and and tried all the tricks which i got. but now able to generate R.java file.
please help me.. Thank in advance...
Edit :
right now i am getting one error like
Description Resource Path Location Type Error executing aapt: Cannot
run program "..\Android_SDK\build-tools\18.0.1\aapt.exe":
CreateProcess error=5, Access is denied: CreateProcess error=5, Access
is denied TestProject line 1 Android ADT Problem
Occassionally I am also fighting with this issue. Sometimes it's tough, but it's usually that something is wrong with your /res/ files. Usually XMLs.
First try to Clean your build, but you did that already.
Look for malformed XMLs, they do not have to be marked in red at first, but try to open them all if you don't see them popup in red. Check that you don't reference ids to another views in styles.xml, check for invalid characters in keys, check for invalid/unescaped characters in content of xml entities.
Also check properties of your project and make sure that all Java Build Path components are checked (Order and Export). Mainly Android one. Sometimes it happens to me, that it's unchecked making my project unbuildable.
If it works on another computer, it seems the code is fine. The problem seems to be either your toolchain or your Eclipse workspace.
Try the following:
If you use Android SDK Tools 17 or higher, make sure you install the corresponding Android SDK Build-tools in Android SDK Manager.
If the above doesn't help, create a new workspace and import your existing code into it.
This is common problem, which can be caused by many different situations.
What always worked for me:
If your R.java is not generated, your project is flooded with errors saying that class R is not recognized (obviously). Usually, somewhere between all those R.java errors, there was one other error (with different that all others) which is often overlooked because of hundredths R.java related errors. If i fixed this other error, R.java is generated after clean/build...
Edit: the "other error" i am talking about that is preventing your R.java to regenerate, is often found somewhere inside resource XML files...
The problem is in your installation path of Eclipse. Just check that your path doesn't have any spaces where you have installed Eclipse. And name should be proper for the Eclipse directory.
I also had the same problem because my Eclipse installation path got spaces in it, and my Eclipse directory name got changed to some symbolic name. When i renamed it to Eclipse and make the installation which contains no space, it got worked.
For example if Eclipse directory path is like
D:/New Folder/Android/Eclipse
Then it may got problem because of space between "New Folder".
Check your path and directory name and if it worked then check my answer please.
I was struggling with this issue for past one hour. I just solve it by
Remove the ".metadata" file from the workplace directory.
Then start the Eclipse.
Import the project from the workplace by File -> Import -> Existing project into workplace under General tab.
The R.java file will be generated. You need to import all other project that were in your workplace the same way.
Hope this will help someone
It seams that I missing the R file, this is a common error and usually I have solved by cleaning the projects, using android tools fix project properties and restarting eclipse.
Now I have installed the new android developer tools eclipse and after importing the project I have this error in eclipse:
Errors occurred during the build.
Errors running builder 'Android Pre Compiler' on project 'MyProject'.
java.lang.NullPointerException
and the R file is not generated so it is missing.
The project is a library project. Thanks
Sometimes if you have errors in an XML file, it will stop the project from building correctly and the resources (project.R) file won't be created properly. You will also need to make sure that you are importing your resource file and not the one from android.R
If you've changed the project build target or minSdkVersion, you might have XML nodes in one of your layout files that isn't supported by the SDK you are using which will stop it from building. That's also worth checking
Go to Project and hit Clean. This should regenerate your R.java file.
Also get rid of any import android.R.* statements and then do the clean up as mentioned.
Otherwise, XML resource under layout may not having the correct naming convention or might be having some capital letters.
Try changing them to lowercase and make sure your layout.xml files don't contains errors.
Clean the project because the project may have trouble finding the name of a resources, it really sucks that i constantly have this problem when adding new image..
I have an Android project for which I use the Eclipse IDE and I wanted to try an use the ProGuard tool to obfuscate/shrink my code. Unfortunately I couldn't get it to work with Eclipse throwing up a ProGuard error when I try to export my project.
To resolve this I altered the necessary project properties file to NOT use ProGuard but Eclipse just complained there were errors with the project which needed to be resolved. I tried cleaning the project, refreshing too but all to no avail. As I use a Mercurial for source control I reverted to my last good sources but now Eclipse throws up even more errors which I cannot get rid of:
org.eclipse.core.internal.resources.ResourceException: Resource is out
of sync with the file system: '/XXXXX/AndroidManifest.xml'.
loadAndParseRClass: failed to find manifest package for project
XXXXXXX
I've never been a great fan of Eclipse but how can I clean my project and get it back to a NON proguard state?
I resolved the problem. There's ANOTHER error log in Eclipse called 'Problems' which tells me my Debug certificate has expired on 25/12/2011. Handy how Eclipse labels this as a 'problem' and not an error and gives no indocation other that a red x that there's some sort of problem!
Anyway I resolved this by going here.
Make sure you Refresh your project so that the state of your Workspace/IDE agrees with your state on disk (Right click on the project and select "Refresh"). This will get rid of the first error you have.
And then just do a Team -> Revert on your projects and select the files that you have changed and want to revert to the checked-in version.
This question already has answers here:
Developing for Android in Eclipse: R.java not regenerating
(64 answers)
Closed 9 years ago.
I am doing the Notepad tutorial, exercise 2. I started by creating a new Android project and chose Create from source to import the downloaded source files for the excercise.
But now I get many errors in Eclipse, and the problem is that there is no generated R.java class. How can I solve this? The folder gen/ is empty.
I have errors on Notepadv2.java and in res/layout/note_edit.xml and both seems to be related to the fact that the generated R.java is missing.
Here is my import statements in Notepadv2.java:
import android.R;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
They are created by the Eclipse command Ctrl+Shift+O.
Go to Project and hit Clean. This should, among others, regenerate your R.java file.
Also get rid of any import android.R.* statements and then do the clean up I mentioned.
Apparently Jonas problem was related to incorrect target build settings. His target build was set to Android 2.1 (SDK v7) where his layout XML used Android 2.2 (SDK v8) elements (layout parameter match_parent), due to this there was no way for Eclipse to correctly generate the R.java file which caused all the problems.
After one whole day trying to find why R file was not generated, I found that after install Android SDK Tools r22 a new option in Tools was available: Android SDK Build Tools.
After installing it R file was generated again.
now you have imported android.R instead of your own R... Try to take a look on your "problems" view if you have errors in one of your xml files... get rid of the import android.R and comment out all usages of R.*
Cleaning should help when your project has no other errors, so check your xml files or file naming in your res folders
Probably u might be using a incorrect SDK version. Right click on your project. Select Properties-->Android. Note that 2.2 is the latest SDK. Check it and see if it gets compiled...
Edit
Also Do a clean after that
I Had a similar problem
Best way to Identify this problem is to identify Lint warnings::
*Right Click on project > Android Tools > Run Lint : Common Errors*
That helps us to show some errors through which we can fix things
which make R.java regenerated once again
By following above steps i identified that i had added some image
files that i have not used -> I removed them -> That fixed the
problem !
Finally Clean the project !
I colleague of mine has this problem - a restart of eclipse fixed it.
Update Android SDK Tools in Android SDK Manager for revision 22.0.1.
It worked for me.
Remove the 'import R.java' line from your code. Its done by Eclipse in order to solve the problem.
Go to "note_edit.xml" file. Wherever you find "match_parent" as an attribute value, replace it with either "fill_parent" or "wrap_content".
Do a clean build. R.java will be generated automatically.
If you got this problem, it means "match_parent" property is not supported in your content. Instead, "fill_parent" is used.
"fill_parent: The view should be as big as its parent (minus padding). This constant is deprecated starting from API Level 8 and is replaced by match_parent. "
Do you have installed the android plugin ?
Your project must be of the android type.
This is actually a bug in the tutorials code. I was having the same issue and I finally realized the issue was in the "note_edit.xml" file.
Some of the layout_heigh/width attributes were set to "match_parent" which is not a valid value, they're supposed to be set to "fill_parent".
This was throwing a bug, that was causing the generation of the R.java file to fail. So, if you're having this issue, or a similar one, check all of your xml files and make sure that none of them have any errors.
I just had a problem where a previously working project stopped working with everything that referenced R being posted as errors because R.java was not being generated.
** * CHECK THE CONSOLE VIEW TOO **
I had (using finder) made a backup of the main icon (not even used)
so one of the res folders (hdpi) had
icon.png
copy of icon.png
Console indicated that "copy of icon.png" was not a valid file name.
No errors were flagged anywhere else - no red X in the res folders....
but replacing the spaces with "_" and it is all back to normal....
I have faced this issue many times. The root problem being
The target sdk version is not selected in the project settings
or
The file default.properties (next to manifest.xml) is either missing or min sdk level not set.
Check those two and do a clean build as suggested in earlier options it should work fine.
Check for errors in "Problems" or "Console" tab.
Lastly : Do you have / eclipse has write permissions to the project folder? (also less probable one is disk space)
I've also experienced such issues as R.java being missing, and also eclipse complaining there are errors in my code (displaying red X icon against class files) when there were no errors.
The only method I've found for solving this is to clean the project by selecting Project > Clean
This seems to solve the issue for myself, running Eclipse 3.5.2
yeah i have the same problem.i fixed it by
selecting Project from the tool bar clean the project
also reset the build automatic option
some times needed to change the name of xml file match format [a-z][0-9]
capital letters must be changed
It seems that when you change to the latest SDK (2.2) building no longer generates an R.java file. Or at least not in the way we're used to. To solve this delete the package underneath the gen folder and clean without building. This solves the issue for me.
I've got that problem because of some internall error in Android plugin. When I've tried to open some layout xml, I've got error:
The project target (Android 2.2) was not properly loaded.
Fortunatelly in my case restarting Eclipse and cleaning the project helped.
This could also be the problem of an incorrect xml layout file for example. If your xml files are not valid (containing errors) the R file will not re-generate after a clean-up. If you fix this, the R file will be generated automatically again.
According to my experince i can summarize :
1.The problem is mainly refering to syntax issues that can be
occured on xml files.
2.You might copy the AndroidManifest.xml accidently to subfolders .
1.One file is an extension undefined .
After checking all of these Go to Project->Clean or just remove the /bin and /gen folders.
Just Restart the Eclipse will solve this Issue as the workspace will be freshly Build ! go to
File -> Restart
Its the easiest way to avoid frustration by going it into Build,properties,blah blah.....
Here's another one: I was just about to cry, but managed to get my beloved R.java back:
I hadn't updated anything in my Android installation for quite a while. I needed a feature and ran the SDK Manager. Besides what I needed I basically checked everything it wanted to update. Afterwards my R.java disappeared in Eclipse.
To make it short, in the SDK Manager there was a new entry "Android SDK Build-tools" that I guess wasn't there the last time I had updated. It's kind of an obvious name, really. After I installed that one Eclipse gave me my R.java back.
java .... than debug..
or
Remove the 'import R.java' line from your code. Its done by Eclipse in order to solve the problem.
Go to "note_edit.xml" file. Wherever you find "match_parent" as an attribute value, replace it with either "fill_parent" or "wrap_content".
Do a clean build. R.java will be generated automatically