Put both DatePicker and TimePicker in a layout XML.
date_time_picker.xml:
The code:
final View dialogView = View.inflate(activity, R.layout.date_time_picker, null);
final AlertDialog alertDialog = new AlertDialog.Builder(activity).create();
dialogView.findViewById(R.id.date_time_set).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
DatePicker datePicker = (DatePicker) dialogView.findViewById(R.id.date_picker);
TimePicker timePicker = (TimePicker) dialogView.findViewById(R.id.time_picker);
Calendar calendar = new GregorianCalendar(datePicker.getYear(),
datePicker.getMonth(),
datePicker.getDayOfMonth(),
timePicker.getCurrentHour(),
timePicker.getCurrentMinute());
time = calendar.getTimeInMillis();
alertDialog.dismiss();
}});
alertDialog.setView(dialogView);
alertDialog.show();