id cannot be resolved or is not a field error

Question

I keep getting this error  Should I just make id a field   My code is   public void onCreate Bundle icicle         super onCreate icicle       setContentView R layout main       ImageView mainimage    ImageView  findViewById R id mainanim       mainimage setBackgroundResource R anim mainanim       mainanimation    AnimationDrawable  mainimage getBackground        How exactly do you fix this

User · Answer

I also had this error when I was working in a Java class once. My problem was simply that my xml file, with the references in it, was not saved. If you have both the xml file and java class open in tabs, check to make sure the xml file name in the tab doesn't have a * by it.

Hope this helps.

User · Answer

For me the cause of the problem was that I had 2 images with the same name in my drawable-hdpi folder  Once I resolved that  then the R java rebuilt itself and the problem was automatically solved

User · Answer

One possible solution -  Summary  make sure you are using import com yourpkgdomainname yourpkgappname R instead of import android R  Details  The problem occured when I changed ID of a label which was being referred in other places in the layout XML file  Due to this error  the R file stopped generating at first  Eclipse is bad in handling errors with the layout files   When I corrected the ID reference  with project clean few times and Eclipse restarts  I noticed that my import packages now has  import android R  Changing it to following fixed the error  import com example app R

User · Answer

In main xml  or wherever your item is defined  make sure that the ID for the R item is defined with   id      Here is an example with a button    lt Button android text  B1  android id    id button one          android layout gravity  center horizontal center          android layout height  fill parent  android layout width  wrap content    gt    Each of these is important because      must precede the string   indicates it will create if not existing  whatever your item is

User · Answer

select Project tab and click Build automatically so Build all option will be activated and then click on build all and always start xml file name with lowercase

User · Answer

As Jake has mentioned  the problem might be because of copy paste code  Check the main xml under res layout  If there is no id field in that then you have a problem  A typical example would be as below      lt com androidplot xy XYPlot android id    id mySimpleXYPlot  android layout width  fill parent  android layout height  fill parent  android layout marginTop  10px  android layout marginLeft  20px  android layout marginRight  20px  title  A Simple Example    gt

User · Answer

Just came across this myself   Finally found my issue was with a  png file that I added that had a capital letter in it an caused exactly the same problem  Eclipse never flagged the file until I closed it and opened Eclipse back up

User · Answer

May be you created a new xml file in Layout Directory that file name containing a Capital Letter which is not allowed in xml file under Layout Directory   Hope this help

User · Answer

Some times eclipse may confuse with other projects in the same directory    Just change package name  don t forget to change in Android manifest file also   ensure the package name is not used already in the directory  It may work

User · Answer

Do not modify the R class  The error means there s something syntactically wrong with your XML layouts and R cannot be auto-generated  Try looking there and post the xml code you re not sure about  if any   Edit   also  remove  import android R  from imports at top of file  if there

User · Answer

I had this problem but in my case it solved by restarting the eclipse

User · Answer

Look at your import statements at the top  If you are saying import android R  then there that is a problem  It might not be the only one as these  R  errors can be tricky  but it would definitely definitely at least part of the problem    If that doesn t fix it  make sure your eclipse plugin ADT  and your android SDK are fully up to date  remove the project from the emulator phone by manually deleting it from the OS  and clean the project  Launch Eclipse- Project- Clean      Sounds silly to make sure your stuff is fully up to date  but the earlier versions of the ADT and SDK has a lot of annoying bugs related to the R files that have since been cleared up    Just FYI  the stuff that shows up in the R class is generated from the stuff in your project res  aka resources  folder  The R class allows you to reference a resource  such as an image or a string  without having to do file operations all over the place  It does other stuff too  but that s for another answer  Android OS uses a similar scheme - it has a resources folder and the class android R is the way to access stuff in the android resources folder  The problem arises when in a single class you are using both your own resources  and standard android resources  Normally you can say import at the top  and then reference a class just using the last bit of the name  for example  import java util List allows you to just write List in your class and the compiler knows you mean java util List   When you need to use two classes that are named the same thing  as is the case with the auto-generated R class  then you can import one of them and you have to fully qualify the other one whenever you want to mean it  Typically I import the R file for my project  and then just say android R whatever when I want an android resource    Also  to reiterate Andy  don t modify the R file automatically  That s not how it s meant to be used

User · Answer

Just Clean your project so R will be generated automatically  This worked for me

User · Answer

It gave me enough pain but I found the solution   PROJECT --- gt  Clean ---- gt   Sele

User · Answer

I just fixed my problem right-clicking in the layout folder and clicking in the option Validate  Some windows will appear  you just clik OK and ist fine

User · Answer

Just throwing this out there  but try retyping things manually   There s a chance that your quotation marks are the  wrong  ones as there s a similar unicode character which looks similar but is NOT a quotation mark   If you copy pasted the code snippits off a website  that might be your problem

User · Answer

What seems to be the problem  I just fixed mine in case anyone was wondering - Due to other errors i turned off build automatically  when i created a new project it said R layout main had an issue and needed to import R  So naturally as a novice  i did  Then i built manually and it had a problem with main   Try building your program as is  remove import R and it should be fine

[android] "id cannot be resolved or is not a field" error?

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