@Override
public boolean onNavigationItemSelected(MenuItem item) {
binding.drawer.closeDrawer(GravityCompat.START);
Page page = Page.forMenuId(item);
toggleToolbarElevation(page.shouldToggleToolbar());
changePage(page.getTitleResId(), page.createFragment());
return true;
}
@Override
public void onBackStackChanged() {
FragmentManager fm = getSupportFragmentManager();
Fragment current = fm.findFragmentById(R.id.content_view);
if (current == null) {
// no more fragments in the stack. finish.
finish();
return;
}
Page page = Page.forName(current);
binding.navView.setCheckedItem(page.getMenuId());
binding.toolbar.setTitle(page.getTitleResId());
toggleToolbarElevation(page.shouldToggleToolbar());
if (current instanceof StackedPageListener) {
StackedPageListener l = (StackedPageListener) current;
l.onTop();
}
}