How to add 2 columns of checkboxes in Spinner dropdown

I have a spinner I want to add two columns of checkboxes in the drop down of spinner.

I have tried this solution android spinner dropdown checkbox but this does not let me show a hint "Please Select..." when no item is selected.

Here is what I want. https://drive.google.com/open?id=11cr0iPgs9vwULeGeTAtllFR-3KW-6YvM