The URLs you link to show how to pop up a dialog with a time picker and another dialog with a date picker. However you need to be aware that you can use those UI widgets directly in your own layout. You could build your own dialog that includes both a TimePicker and DatePicker in the same view, thus accomplishing what I think you are looking for.
In other words, instead of using TimePickerDialog and DatePickerDialog, just use the UI widgets TimePicker and DatePicker directly in your own dialog or activity.
