protected override async void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.activityManageCategories);
_preferences = new PreferenceWrapper(this);
var toolbar = FindViewById <Toolbar>(Resource.Id.toolbar);
SetSupportActionBar(toolbar);
SupportActionBar.SetTitle(Resource.String.categories);
SupportActionBar.SetDisplayHomeAsUpEnabled(true);
SupportActionBar.SetDisplayShowHomeEnabled(true);
SupportActionBar.SetHomeAsUpIndicator(Resource.Drawable.ic_action_arrow_back);
_rootLayout = FindViewById <RelativeLayout>(Resource.Id.layoutRoot);
_addButton = FindViewById <FloatingActionButton>(Resource.Id.buttonAdd);
_addButton.Click += OnAddClick;
var connection = await Database.GetSharedConnection();
_categorySource = new CategorySource(connection);
_categoryListAdapter = new ManageCategoriesListAdapter(_categorySource);
_categoryListAdapter.MenuClick += OnMenuClick;
_categoryListAdapter.HasStableIds = true;
_categoryListAdapter.DefaultId = _preferences.DefaultCategory;
_categoryList = FindViewById <RecyclerView>(Resource.Id.list);
_emptyStateLayout = FindViewById <LinearLayout>(Resource.Id.layoutEmptyState);
_categoryList.SetAdapter(_categoryListAdapter);
_categoryList.HasFixedSize = true;
var layout = new FixedGridLayoutManager(this, 1);
_categoryList.SetLayoutManager(layout);
var callback = new ReorderableListTouchHelperCallback(this, _categoryListAdapter, layout);
var touchHelper = new ItemTouchHelper(callback);
touchHelper.AttachToRecyclerView(_categoryList);
var decoration = new DividerItemDecoration(this, layout.Orientation);
_categoryList.AddItemDecoration(decoration);
var layoutAnimation = AnimationUtils.LoadLayoutAnimation(this, Resource.Animation.layout_animation_fade_in);
_categoryList.LayoutAnimation = layoutAnimation;
await Refresh();
}
