Checkbox inside a spinner validation

I have multiple checkboxes inside a spinner. How to validate it when nothing is selected.

if(spinner_inperson.getSelectedItem()!="select"){
        //Toast.makeText(spinner_crop_sown.this, "Unesite ime", Toast.LENGTH_LONG).show();
        Toast.makeText(getApplicationContext(), "Please select Inperson Spinner Dropdown", Toast.LENGTH_LONG).show();
        return false;
    }

Here is the sample code which I tried