protected override void OnPrepareDialogBuilder(AlertDialog.Builder builder)
{
base.OnPrepareDialogBuilder(builder);
var preference = GetPreference();
if (preference.GetEntries() == null || preference.GetEntryValues() == null)
{
throw new Java.Lang.IllegalStateException(
"MultiSelectListPreference requires an entries array and an entryValues array.");
}
var checkedItems = preference.GetSelectedItems();
var values = preference.GetEntryValues();
var entries = preference.GetEntries();
builder.SetMultiChoiceItems(entries, checkedItems, (s, e) =>
{
if (_readOnlyEntriesPosition?.Count > 0 && _listView != null && _readOnlyEntriesPosition.Contains(e.Which))
{
_listView.SetItemChecked(e.Which, !e.IsChecked);
return;
}
_preferenceChanged = true;
if (e.IsChecked)
{
_newValues.Add(values[e.Which]);
}
else
{
_newValues.Remove(values[e.Which]);
}
});
if (preference.ReadOnlyEntries?.Count > 0)
{
var entriesList = preference.GetEntries().ToList();
if (entriesList.Count > 0)
{
var readOnlyEntries = (from entry in entriesList
from readOnlyEntry in preference.ReadOnlyEntries
where string.Equals(entry, readOnlyEntry, StringComparison.OrdinalIgnoreCase)
select entry).ToArray();
if (readOnlyEntries.Length > 0)
{
_readOnlyEntriesPosition = readOnlyEntries.Select(p => entriesList.IndexOf(p)).ToArray();
}
}
}
_newValues.Clear();
for (var i = 0; i < checkedItems.Length; i++)
{
if (!checkedItems[i])
{
continue;
}
_newValues.Add(values[i]);
}
}