I refer to the code example in the book, where the following line shows in red: The DialogActivity example includes the line:

This line shows the toolbar identifier in red, because it is not recognized. All searches I have done have a simple restart or clean and rebuild as the solution, but not for my instance of this problem. I have tried about 4 suggested remedies already with no solution.

I only have about 1 month Java and Android studio experience, so please forgive me if this is a stupid or often asked question.

I suspect I need to add a reference to something in the project; that normally solves unknown identifiers, but I have no idea where or how, or even what they're really called, to find these references.

From what I'm reading through this forum, the code examples that are provided in the book are not complete. I tried downloading the example code and opening that as a project and it still gave me tons of errors. Once I got past all the gradle dependency issues and sdk tool version compatibility errors, all references for my imports, and "R", all give the error that the symbol cannot be resolved.

Very hard to learn when example are missing information and not straight forward.

Sorry this isn't an answer just a bump in the thread because no one seems to have the full answer on how to complete these examples.