how to use OnDateChangedListener
<p>How to use <code>OnDateChangedListener</code></p>

<p>I have <code>datepicker</code> dialog it shows well. But I want to use <code>OnDateChangedListener</code> using <code>datepicker</code> programmatically like <code>DatePicker picker = new DatePicker(this);</code></p>
