"Cannot resolve symbol "R" - all XML android:ids are correct

Question

I edited a small amount of my xml code (tried to add an android:src"@drawable/" but it didn't seem to like it so I deleted it after) and my java code (added Troop1P1.setVisibility(View.VISIBLE); to the end of an OnClickListener, and again deleted afterwards [I had already used findViewByID for Troop1P1]).

However, my whole code has now stopped working, with every "R" in (R.id.) being highlighted, with the text "Cannot resolve symbol "R"" when hovered over.

In addition, when I run the code I get the following error:

error: Error: No resource found that matches the given name (at 'layout_above' with value '@id/btnTroop1P2').

However, I've checked and I'm fairly sure I've correctly id'd btnTroop1P2 using android:id="@+id/btnTroop1P2", so I can't find any problems there.

I'd really appreciate any help, I just want to be able to run my project again!

Answer 1

are you using Eclipse? .if yes go to Project -> Clean... -> Tick your project name -> OK. Give that a try. I always get similar problems and this solves it for me anyway.

Answer 2

When this occurs, it's usually because you have an error in your layout XML. When an error exists there, the R file is not generated. Therefore, Cannot resolve symbol "R" is the only information Java can give you. Go back into your drawable, layout, or any other XML you've been playing with and make sure you have everything properly formatted.