public override Dialog OnCreateDialog(Bundle savedInstanceState)
{
var alert = new AlertDialog.Builder(Activity);
alert.SetTitle(Resource.String.chooseCategories);
alert.SetCancelable(false);
alert.SetPositiveButton(Resource.String.ok, (EventHandler <DialogClickEventArgs>)null);
var view = Activity.LayoutInflater.Inflate(Resource.Layout.dialogChooseCategories, null);
_categoryList = view.FindViewById <RecyclerView>(Resource.Id.dialogChooseCategories_list);
alert.SetView(view);
var dialog = alert.Create();
dialog.Show();
var layout = new LinearLayoutManager(Context);
var decoration = new DividerItemDecoration(Context, layout.Orientation);
_categoryList.AddItemDecoration(decoration);
_categoryList.SetLayoutManager(layout);
_categoryAdapter = new ChooseCategoriesAdapter(_categorySource);
_categoryAdapter.ItemClick += _itemClick;
_categoryList.SetAdapter(_categoryAdapter);
_categoryList.HasFixedSize = true;
_categoryList.SetItemViewCacheSize(20);
var okButton = dialog.GetButton((int)DialogButtonType.Positive);
okButton.Click += _onClose.Invoke;
var emptyText = view.FindViewById <TextView>(Resource.Id.dialogChooseCategories_empty);
if (_categorySource.Count() == 0)
{
emptyText.Visibility = ViewStates.Visible;
_categoryList.Visibility = ViewStates.Gone;
}
foreach (var category in _checkedCategories)
{
var index = _categorySource.Categories.FindIndex(c => c.Id == category);
_categoryAdapter.CheckedStatus[index] = true;
}
return(dialog);
}
private void CheckEmptyState()
{
if (_categorySource.Count() == 0)
{
_emptyState.Visibility = ViewStates.Visible;
_categoryList.Visibility = ViewStates.Gone;
var animation = new AlphaAnimation(0.0f, 1.0f)
{
Duration = 500
};
_emptyState.Animation = animation;
}
else
{
_emptyState.Visibility = ViewStates.Gone;
_categoryList.Visibility = ViewStates.Visible;
}
}
private async Task UpdateCategories(bool updateSource = true)
{
await _categorySource.UpdateTask;
if (updateSource)
{
await _categorySource.Update();
}
_categoriesMenu.Clear();
var allItem = _categoriesMenu.Add(Menu.None, -1, Menu.None, Resource.String.categoryAll);
allItem.SetChecked(true);
for (var i = 0; i < _categorySource.Count(); ++i)
{
_categoriesMenu.Add(0, i, i, _categorySource.Categories[i].Name);
}
}