i had a working prototype when at one build i ran into a disk-full problem... removed the clutter on my HD and tried to re-organize my code a little bit. I didn't found at that moment the tip to force the display of the directory structure of the source tree by dropping a file on a directory of that (otherwise emtpy) tree and did the renaming and shifting by hand.....
grepped over the whole code to change all references, and started studio again, everything compiles, but i got the dreaded "package R does not exist" message...
i went over the archive of that type of question.... no error flags on the xml layout files i upgraded the ADK SDK to build 22.6, i removed the whole src/gen tree i added a new layout checked that R isn't imported i cleaned my build and re-build it
still, it won't compile due to that error i am at a loss what to try next to get it running again?
So I discovered that if you put something below another thing in the XML like this for example:
android:layout_below"@id/something"
It will kill your R.
You can fix it by changing the code to this:
android:layout_below"@+id/something"
This kinda thing has been happening to me a lot lately.