Navigation Drawer: How to Set the Selected Item at Startup

Navigation drawer: How do I set the selected item at startup?

Use the code below:

navigationView.getMenu().getItem(0).setChecked(true);

Call this method after you call setNavDrawer();

The getItem(int index) method gets the MenuItem then you can call the setChecked(true); on that MenuItem, all you are left to do is to find out which element index does the default have, and replace the 0 with that index.

You can select(highlight) the item by calling

onNavigationItemSelected(navigationView.getMenu().getItem(0));

Here is a reference link: http://thegeekyland.blogspot.com/2015/11/navigation-drawer-how-set-selected-item.html

EDIT
Did not work on nexus 4, support library revision 24.0.0. I recommend use

navigationView.setCheckedItem(R.id.nav_item);

answered by @kingston below.

Android navigation drawer default selected on start

You only need to add code:

navigationView.setCheckedItem(R.id.nav_new);

NavigationView set selected item as checked

Use the code below:

navigationView.getMenu().getItem(0).setChecked(true);

Call this method after you call setNavDrawer();

The getItem(int index) method gets the MenuItem then you can call the setChecked(true); on that MenuItem, all you left to do and find out is which element index does the home the default have, and replace the 0 with that index.

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

In onCreate(), following code will load the first item's fragment upon first start:

if (savedInstanceState == null) {
    navigationView.getMenu().performIdentifierAction(R.id.posts, 0);
}

Thanks to calvinfly for this comment.

How to change selected Item in the navigation drawer depending on the activity/view?

Seems like you have not yet implemented the switching of the content area. I suggest you use fragments for this.
So, if you use fragments, override onAttachFragment of your activity like:

@Override
public void onAttachFragment(Fragment fragment) {
    super.onAttachFragment(fragment);
    int id;
    if(fragment instanceof HealthDiaryFragment) id = R.id.nav_healthdiary;
    else
    if(fragment instanceof AppointmentFragment) id = R.id.nav_appointment;
    ...
    else return;
    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setCheckedItem(id);
}

Also, modify your onBackPressed:

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        if(getFragmentManager().getBackStackEntryCount()>1) {
            getFragmentManager().popBackStack();
        }
        else {
            super.onBackPressed();
        }
    }

    /*navigationView.getMenu().getItem(0).setChecked(true);*/
}

This is assuming that in your handling of drawer selection you replace fragments with pushing them on the back stack.

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