No generated R java file in my project

Question

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

User · Answer

Do you have installed the android plugin    Your project must be of the android type

User · Answer

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

User · Answer

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

User · Answer

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

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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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Update Android SDK Tools in Android SDK Manager for revision 22 0 1  It worked for me

User · Answer

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

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I colleague of mine has this problem - a restart of eclipse fixed it

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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  gt  Clean  This seems to solve the issue for myself  running Eclipse 3 5 2

User · Answer

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

User · Answer

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

[android] No generated R.java file in my project

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