I'm trying to add submenu
items to NavigationView
programmatically . I'm able to add items into menu
but not into submenu
Adding items to menu works
Menu menu = mNavigationView.getMenu();
menu.add(Menu.NONE, Menu.NONE, index, "Menu Item1");
But adding items to sub menu doesn't work
Menu menu = mNavigationView.getMenu();
SubMenu subMenu = menu.addSubMenu("Sub menu title");
subMenu.add(Menu.NONE, Menu.NONE, index, "SubMenu Item1");
The trick to call BaseAdapter.notifyDataSetChanged
on the underlying Adapter
that contains the menu items. You could use reflection to grab the ListView
or just loop over the NavigationView
children until you reach it.
This isn't the most up-to-date code, as fas as I know Google hasn't pushed the most recent changes to the Support Library, but essentially NavigationMenuPresenter.prepareMenuItems
is called when you call BaseAdpater.notifyDataSetChanged
.
But if you want to see the most recent source, you can download it through the SDK Manager. Choose Sources for Android MNC. Then navigate to
yourAndroidSDK/sources/android-MNC/android/support/design/internal/NavigationMenuPresenter.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
final Menu menu = mNavigationView.getMenu();
for (int i = 0; i < 4; i++) {
menu.add("Menu Item " + (i + 1));
}
final SubMenu subMenu = menu.addSubMenu("SubMenu Title");
for (int i = 0; i < 2; i++) {
subMenu.add("SubMenu Item " + (i + 1));
}
for (int i = 0, count = mNavigationView.getChildCount(); i < count; i++) {
final View child = mNavigationView.getChildAt(i);
if (child != null && child instanceof ListView) {
final ListView menuView = (ListView) child;
final HeaderViewListAdapter adapter = (HeaderViewListAdapter) menuView.getAdapter();
final BaseAdapter wrapped = (BaseAdapter) adapter.getWrappedAdapter();
wrapped.notifyDataSetChanged();
}
}
}
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