If user doesn't change date, set variable
<p>If the user clicks on a button, I set myVar = true, then show a date picker dialog. In the date set listener, onDateSet, I check to see if myVar = true. If so, I do a little extra then set myVar = false.</p>

<p>Problem is, if somebody clicks the button then doesn't continue to set a date. They click back or they click cancel... myVar still = true. If they fail to change the date, I need myVar = false. What's the best way to go about this?</p>
