Took me ages to figure this one out in all circumstances.
R java not updating eclipse
The reason I think this happens is that whatever process auto-generates file starts at the top of your resources and works it’s way down to the bottom.
If it encounters an error somewhere along the way, it just stops – leaving whatever resources haven’t been added to out but neglecting to tell you R cannot be resolved.
When programming Android apps, the accepted way to implement your program’s resources is defining them via an external XML file, thus ensuring your presentation layer is divorced from your application layer.
What this essentially means is that instead of creating things like user interfaces and strings in code, you create an XML file to hold this information under the ‘res’ project directory.
This communication is handled by the Android Debug Bridge (adb).
However, this isn’t the R file including in your project package.For example, say my Activity classes or whatever are included in the “com.thenode.mobile” package and you’re trying to reference the above “maingui” View layout (R.layout.maingui), you’re actually trying to reference: – .The Eclipse ADT plugin handles actually holding references to all these resources via the R class, which is re-generated whenever a new resource is defined or the project is rebuild and is held under the ‘gen’ project directory. For example, say I had defined a simple Activity layout called “maingui” and tried to reference this in my Activity start up code like so: – The first thing you might notice is that the file under your Eclipse project is missing.This will naturally bring up the error because R cannot be found.The first thing to try is to clean the project so that the Eclipse ADT will automatically attempt to rebuild the file.Under Eclipse, go to: – to import your R resource into your project for easy referencing.