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One of my activity screens is displaying the app_name where it should put the activity name
My project is called FindMe and is uploaded and shared on gitHub. The activity in question is my addMedia activity. My selectProfile and splash screen activities show their activity names at runtime as expected. The addMedia activity shows the app_name instead. I see no differences in the xml files.
Ken AlgerTreehouse Teacher
I opened your project up again (Android Studio 1.0.2) and I get the same experience as you in the graphical layout editor. However, when the app runs in the emulator I get the results as posted above. I'm not sure why the editor is different from the emulator and an actual device in the Action Bar. I called it the Menu Bar yesterday which was incorrect. I know there can be differences between the editor and reality, but I'm not sure why in this case.
I would take a look at a few posts on Stack Overflow for general info on the subject and perhaps something will pop to mind: