This is my xml file:

    <?xml version="1.0" encoding="utf-8"?>
    <menu xmlns:android="http://schemas.android.com/apk/res/android">
        <item
            android:id="@+id/settings_id"
            android:title="@string/settings"
            android:showAsAction="always"
            />
        <item
            android:id="@+id/about_us_id"
            android:title="@string/about_us"
            android:showAsAction="never"
            />
        <item
            android:id="@+id/rate_id"
            android:title="@string/rate_us"
            android:showAsAction="never"
            />
    </menu>

These is my onCreateOptionsMenu() and onCreate() methods:

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.clear();
        getMenuInflater().inflate(R.menu.main_menu, menu);
        super.onCreateOptionsMenu(menu);
        return true;
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

    }