PickDateDialog.java

package com.realtrackandroid.views.dialogs;

import java.util.Calendar;
import java.util.Date;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.widget.DatePicker;

public class PickDateDialog extends DialogFragment implements DatePickerDialog.OnDateSetListener {

  PickDateDialogListener callingActivity;

  public PickDateDialog() {
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
      callingActivity = (PickDateDialogListener) activity;
    }
    catch (ClassCastException e) {
      throw (new ClassCastException("ERROR: " + activity.toString()
              + " MUST implement the PickDateDialogListener interface!!!"));
    }
  }

  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current date as the default date in the picker
    // get the start date
    final Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);

    DatePickerDialog datePickerDialog = new DatePickerDialog(getActivity(), this, year, month, day);

    if (getArguments().containsKey("displaydate")) {
      Long displayDate = getArguments().getLong("displaydate");
      c.setTime(new Date(displayDate));
      year = c.get(Calendar.YEAR);
      month = c.get(Calendar.MONTH);
      day = c.get(Calendar.DAY_OF_MONTH);
      datePickerDialog = new DatePickerDialog(getActivity(), this, year, month, day);
    }

    if (getArguments().containsKey("mindate")) {
      Long minDate = getArguments().getLong("mindate");
      datePickerDialog.getDatePicker().setMinDate(minDate);
    }

    if (getArguments().containsKey("maxdate")) {
      Long maxDate = getArguments().getLong("maxdate");
      datePickerDialog.getDatePicker().setMaxDate(maxDate);
    }

    datePickerDialog.getDatePicker().setCalendarViewShown(false); // Unpredictable Android crap
                                                                  // again. Workaround for
                                                                  // CalendarView bug that causes
                                                                  // NPE:
                                                                  // http://stackoverflow.com/a/18700331
    return datePickerDialog;
  }

  @Override
  public void onDateSet(DatePicker view, int year, int month, int day) {
    callingActivity.setDate(String.format("%02d/%02d/%4d", (month + 1), day, year));
  }

}