How to select the first item in a navigation drawer and open a fragment on application start

Question

I have created MainActivity with NavigationView. When Activity is opened I want to automatically select the first item in the navigation d

Answer 1

Instead of normal listener ...

navView.setNavigationItemSelected(new Navigation.View.OnNavigationItemSelectedListener() {bla, bla, bla})

Create the listener as an Obj:

NavigationView.OnNavigationItemSelectedListener navViewListener;
            navView.setNavigationItemSelectedListener(navViewListener = new NavigationView.OnNavigationItemSelectedListener() {bla, bla, bla})

...and use the Obj to trigger the listener event:

navViewListener.onNavigationItemSelected(navView.getMenu().getItem(0));

...where getItem(0) is the first menu item.

Use a method getItem(0).setChecked(true) or android:checked="true" at its menu item XML definition.