Cannot resolve symbol 'menu' errors in Android Studio

Question

I'm learning Android Development for Beginners from Udacity and have completed making an app named Court Counter in which I wrote code for an XML (activity_main.xml) and some code for Java (MainActivity.java) file as some of the code was provided by the Udacity team on Github.

But when I click on 'Build APK' I get two errors both from the Java file:

1. Cannot resolve symbol 'menu' in the following code:-

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);
       return true;
   }
   

2. Cannot resolve symbol 'action_settings':-

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();
   
       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           return true;
       }
   
       return super.onOptionsItemSelected(item);
   }
   

I don't know what happens when these block of code are executed but I want to run the app on my phone!

Answer 1

With more than 20 years of experiencie i can tell you a very difficult solution for the menu problem on android studio...:

*********** Close the project an open it again ************************