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copied!<p>If you are talking about Listeners, like <code>OnClickListener</code>, then yes: You can create your own listeners and trigger them. </p> <p>Basically you start by defining an interface for that Listener. For a DaterTimePicker (which has a DaterPicker and TimerPicker) widget I once used</p> <pre><code> public interface OnDateTimeSetListener { public abstract void onDateTimeSet(DatePicker datePicker, TimePicker timePicker); } </code></pre> <p>The interface defines a single Method which has to be implemented by your listeners. </p> <p>Then in your class you do something like</p> <pre><code>public class DateTimePickerDialog extends AlertDialog { private OnDateTimeSetListener onDateTimeSetListener; private DatePicker datePicker; private TimePicker timePicker; public void setOnDateTimeListener(OnDateTimeSetListener l) { this.onDateTimeSetListener = l; } private onDateTimeSet() { if(onDateTimeSetListener!=null) onDateTimeSetListener.onDateTimeSet(this.datePicker, this.timePicker); } private doSomething() { // Do your code here // fire up the event once finished onDateTimeSet(); } } </code></pre> <p><code>setOnDateTimeListener()</code> is used to set listeners from <strong>outside of the class</strong> (i.e. in your main activity).</p> <p><code>onDateTimeSet</code> is used internally (hence declared private) to fire the event and to check if <code>onDateTimeSetListener</code> was set or else we'd get a <code>NullPointerException</code> if it wasn't set. If it was set, call it's <code>onDateTimeSet</code> method. </p> <p>And in your main <code>Activity</code> you simply add an listener to it and add the code you need, like:</p> <pre><code>DateTimePicker dateTimePicker = (DateTimePicker)findViewById(R.id.datetime); dateTimePicker.setOnDateTimeListener(new OnDateTimeSetListener () { void onDateTimeSet(DatePicker datePicker, TimePicker timePicker) { // Date/Time was changed Log.d("OnDateTimeSet", "Date/time was updated"); } }); </code></pre> <p>Here you set up the listener the same way you'd set up an <code>OnClickListener</code>.</p> <p>It's quite a bit of code for a you have to do for a simple event, but as far as I know it's the right way to implement this.</p>

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