Multi choice list with advanced features and working sample for Xamarin.Android
Copy adapter_list_multi.cs from main folder and adapter_list_multi.axml from Resources/layout folder and access it with namespace using these functions
MultiAdapter = new Adapter_List_Multi(context, items, SelectAllButton, SelectAll);
list.Adapter = MultiAdapter;
to access selected items use
string SelectedItems = MultiAdapter.SelectedItemsToString(", "); // will output something like "potatoes, onions..."
int[] Positions = MultiAdapter.SelectedPositions; // will put selected items positions in array of integer
Check sample for more details and enjoy!
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