message: Added onDateChange callback support  for datePicker android.
diff: @@ -52,7 +52,9 @@ export class DatePicker extends React.Component {
  });
  const { action, year, month, day } = newDate;
  if (action === "dateSetAction") {
  - this.setState({ chosenDate: new Date(year, month, day) });
  + let selectedDate = new Date(year, month, day);
  + this.setState({ chosenDate: selectedDate });
  + this.props.onDateChange(selectedDate);
  }
  } catch ({ code, message }) {
  console.warn("Cannot open date picker", message);
  