public class MainActivity extends EasySideNavigation {
	...
}

...
    Toolbar mToolbar;
    
    // Set the main layout resource. It includes a toolbar
    @Override
    protected int setLayoutResource() {
        return R.layout.activity_main;
    }
    
    // Main layout has been inflated
    @Override
    protected void onViewReady(View view) {
        mToolbar = findViewById(R.id.toolbar);
    }

    // Set the toolbar
    @Override
    protected Toolbar setToolbar() {
        return mToolbar;
    }
    
    // Set the header navigation view layout resource
    @Override
    protected int setNavigationHeaderResource() {
        return R.menu.header_navigation_menu;
    }

    // Set the navigation menu resource
    @Override
    protected int setNavigationMenu() {
        return R.menu.navigation_menu;
    }

    // Get all navigation component, the menu & the header view
    @Override
    protected void getNavigationComponent(Menu menu, View headerView) {
        MenuItem nav_notification = menu.findItem(R.id.action_notification);

        nav_notification.setTitle("NewTitleForNotification");

        final TextView tvName = headerView.findViewById(R.id.tv_name);
        tvName.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this, tvName.getText().toString(), Toast.LENGTH_SHORT).show();
            }
        });
    }
    
    // Listener when navigation item has been selected
    @Override
    protected void onNavigationItemSelected(MenuItem menuItem) {

    }
...