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I want to build NavigationDrawer with the possibility of adding new items (such as yahoo weather App with adding new cities). I have working NavigationDrawer with NavigationView, in menu I have permanent fields:

 <group
 android:id="@+id/group"
 android:checkableBehavior="single">
 <item
 android:checked="false"
 android:id="@+id/item1"
 android:icon="@drawable/ic_inbox_black_24dp"
 android:title="Item1" />
 <item
 android:checked="false"
 android:id="@+id/Item2"
 android:icon="@drawable/ic_inbox_black_24dp"
 android:title="Item2"
 />
 </group>

I'm trying to add new Item this method:

 public boolean addNewItem(String itemName)
 Menu menu = navigationView.getMenu();
 menu.add(R.id.group,Menu.NONE,Menu.NONE,itemName);
 return true;
 

And I'm getting not exactly what I want:

Does anyone have an idea how to solve this problem? Or why is this happening?
I do not know where and how one can hold information about the added elements. Any ideas?

To add the Item programmatically, we can get a Menu object using getMenu() method of NavigationView and then we can add Items into the navigation drawer using that Menu object.

final Menu menu = navigationView.getMenu();
for (int i = 1; i <= 3; i++) 
 menu.add("Runtime item "+ i);

Using SubMenu, we can add a subsection and Items into it.

// adding a section and items into it
final SubMenu subMenu = menu.addSubMenu("SubMenu Title");
for (int i = 1; i <= 2; i++) 
 subMenu.add("SubMenu Item " + i);

for more details Check TechnoTalkative.

EDIT:
If you want to interact with the menu, use
menu.add(0, itemId, 0, title); and then

 public boolean onNavigationItemSelected(MenuItem item) {
 // Handle navigation view item clicks here.
 int id = item.getItemId();

id will give you assigned itemId

Suppose you have two groups, group1 and group2. If you want to dynamically add items to group1, then you can assign priority to group2 to make it always below group1. Then when you add new items to group1, it won't be inserted below group2.

Here is a sample:

<group android:id="@+id/group1" />
<group
 android:id="@+id/group2"
 android:orderInCategory="999">
 <item
 android:checked="false"
 android:id="@+id/item1"
 android:icon="@drawable/ic_inbox_black_24dp"
 android:title="Item1" />
 <item
 android:checked="false"
 android:id="@+id/Item2"
 android:icon="@drawable/ic_inbox_black_24dp"
 android:title="Item2"
 />
</group>

And when you add menu items to group1:

Menu menu = navigationView.getMenu();
menu.add(R.id.group1,Menu.NONE,Menu.NONE,itemName);

This should work. I tested it on Android design library 23.1.1.