Only getting DatePickerDialog's value when Done button is being pressed
<p>By referring <code>DateWidgets1.java</code> in API demo, I tend to show date picker widget through the following way.</p>

<pre><code>private void initDateTextView() {
    dateTextView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            showDialog(DATE_DIALOG_ID);                
        }            
    });
}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
       // set date picker as current date
       return new DatePickerDialog(this, datePickerListener, 
                     this.year, this.month, this.date);
    }
    return null;
}

@Override
protected void onPrepareDialog(int id, Dialog dialog) {
    switch (id) {
    case DATE_DIALOG_ID:
        ((DatePickerDialog)dialog).updateDate(this.year, this.month, this.date);
    }        
}

private static final int DATE_DIALOG_ID = 0;
private final DatePickerDialog.OnDateSetListener datePickerListener = new DatePickerDialog.OnDateSetListener() {
    // When dialog box is closed, below method will be called.
    public void onDateSet(DatePicker view, int selectedYear, int selectedMonth, int selectedDay) {
        Log.i("CHEOK", selectedYear + ", " + selectedMonth + ", " + selectedDay);
    }
};
</code></pre>

<hr>

<p>However, I realize, onDateSet will always be called, with latest spinner selected date, regardless I am pressing dialog's <strong>Done</strong> button, or pressing the phone's soft back button.</p>

<p>I am only interested in getting the selected date, when user pressing <strong>Done</strong> button, but not back button.</p>

<p>Is there any way I can achieve so?</p>
