void CreateDialog()
{
_listView = new AListView(_context);
_listView.Focusable = false;
_listView.DescendantFocusability = Android.Views.DescendantFocusability.AfterDescendants;
_listView.SetPadding(
(int)_context.ToPixels(_PickerCell.Padding.Left),
(int)_context.ToPixels(_PickerCell.Padding.Top),
(int)_context.ToPixels(_PickerCell.Padding.Right),
(int)_context.ToPixels(_PickerCell.Padding.Bottom)
);
_listView.SetDrawSelectorOnTop(true);
_listView.ChoiceMode = _PickerCell.MaxSelectedNumber == 1 ? Android.Widget.ChoiceMode.Single : Android.Widget.ChoiceMode.Multiple;
_adapter = new PickerAdapter(_context, _PickerCell, _listView);
_listView.OnItemClickListener = _adapter;
_listView.Adapter = _adapter;
_adapter.CloseAction = () =>
{
_dialog.GetButton((int)DialogButtonType.Positive).PerformClick();
};
if (_dialog == null)
{
using (var builder = new AlertDialog.Builder(_context)) {
builder.SetTitle(_PickerCell.PageTitle);
builder.SetView(_listView);
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (o, args) =>
{
ClearFocus();
});
builder.SetPositiveButton(global::Android.Resource.String.Ok, (o, args) =>
{
_adapter.DoneSelect();
UpdateSelectedItems();
_PickerCell.InvokeCommand();
ClearFocus();
});
_dialog = builder.Create();
}
_dialog.SetCanceledOnTouchOutside(true);
_dialog.SetOnDismissListener(this);
_dialog.SetOnShowListener(this);
_dialog.Show();
// Pending
//var buttonTextColor = _PickerCell.AccentColor.IsDefault ? Xamarin.Forms.Color.Accent.ToAndroid() : _PickerCell.AccentColor.ToAndroid();
//_dialog.GetButton((int)DialogButtonType.Positive).SetTextColor(buttonTextColor);
//_dialog.GetButton((int)DialogButtonType.Negative).SetTextColor(buttonTextColor);
}
}
/// <summary>
/// Displays a searchable list dialog.
/// </summary>
/// <typeparam name="T">The type of the list and object in the callback</typeparam>
/// <param name="input">The list of objects to choose from</param>
/// <param name="title">The title of the dialog</param>
/// <param name="cancel">The text for the cancel button, can be null</param>
/// <param name="hint">The text for the hint, can be null</param>
/// <param name="callback">The method to be called when an item from the list is chosen or cancel have been pressed.
/// The first parameter is true if an item have been selected or false if cancel has been pressed
/// The second parameter is the item if selected or null if cancel have been pressed </param>
public void ShowSearchListDialog <T>(List <T> input, string title, string cancel, string hint, Action <bool, T> callback) where T : class
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.Context);
LinearLayout layout = new LinearLayout(MainActivity.Context); //Creates a linearlayout to hold the edittext and listview
layout.Focusable = true; //Sets such that this layout can be focused
layout.FocusableInTouchMode = true; //Needed for the layout to get focus before edittext
layout.DescendantFocusability = DescendantFocusability.BeforeDescendants; //Needed for the layout to get focus before edittext
layout.SetGravity(GravityFlags.Center); //Sets such that the edittext and listview should be centered in the layout
layout.Orientation = Orientation.Vertical; //Such that the edittext and listview is stacked vertical.
layout.SetPadding(64, 0, 64, 32); //Sets the padding for the content
EditText userInput = new EditText(MainActivity.Context);
userInput.SetMinimumWidth(500); //Sets the minimum width of the edittext field
userInput.Gravity = GravityFlags.CenterHorizontal; //Sets such that the text is centered horizontal
Android.Widget.ListView listView = new Android.Widget.ListView(MainActivity.Context);
ArrayAdapter <T> adapter = new ArrayAdapter <T>(MainActivity.Context, Android.Resource.Layout.SimpleListItem1, input);
listView.Adapter = adapter;
listView.ItemClick += (sender, args) => { DismissSearchListDialog(); HideKeyboard(userInput); callback(true, adapter.GetItem(args.Position)); }; //When an item is clicked return it to the caller
userInput.TextChanged += (sender, args) => { adapter.Filter.InvokeFilter(userInput.Text); }; //When the edittext text changes filter the listview
listView.SetPadding(0, 16, 0, 0); //Adds some padding between the edittext and listview
if (!string.IsNullOrWhiteSpace(hint))
{
userInput.Hint = hint;
}
userInput.InputType = Android.Text.InputTypes.ClassText;
layout.AddView(userInput); //Adds the edittext to the layout
layout.AddView(listView);
if (!string.IsNullOrWhiteSpace(title))
{
builder.SetTitle(title);
}
builder.SetView(layout); //Sets the layout to be the view of the dialog
layout.LayoutParameters = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.WrapContent); //Sets the hight and width of the layout
if (!string.IsNullOrWhiteSpace(cancel))
{
builder.SetNegativeButton(cancel, ((sender, args) => { DismissSearchListDialog(); HideKeyboard(userInput); callback(false, null); }));
}
searchList = builder.Create();
searchList.Show();
}