src/com/android/datetimepicker/date/DatePickerDialog.java - platform/frameworks/opt/datetimepicker - Git at Google

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.datetimepicker.date;

 import android.animation.ObjectAnimator;
 import android.app.Activity;
 import android.app.DialogFragment;
 import android.content.Context;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.os.Vibrator;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.ViewAnimator;

 import com.android.datetimepicker.R;
 import com.android.datetimepicker.Utils;
 import com.android.datetimepicker.date.SimpleMonthAdapter.CalendarDay;

 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Locale;

 /**
  * Dialog allowing users to select a date.
  */
 public class DatePickerDialog extends DialogFragment implements
         OnClickListener, DatePickerController {

     private static final String TAG = "DatePickerDialog";

     private static final int UNINITIALIZED = -1;
     private static final int MONTH_AND_DAY_VIEW = 0;
     private static final int YEAR_VIEW = 1;

     private static final String KEY_SELECTED_YEAR = "year";
     private static final String KEY_SELECTED_MONTH = "month";
     private static final String KEY_SELECTED_DAY = "day";
     private static final String KEY_LIST_POSITION = "list_position";
     private static final String KEY_WEEK_START = "week_start";
     private static final String KEY_YEAR_START = "year_start";
     private static final String KEY_YEAR_END = "year_end";
     private static final String KEY_CURRENT_VIEW = "current_view";
     private static final String KEY_LIST_POSITION_OFFSET = "list_position_offset";

     private static final int DEFAULT_START_YEAR = 1900;
     private static final int DEFAULT_END_YEAR = 2100;

     private static final int ANIMATION_DURATION = 300;
     private static final int ANIMATION_DELAY = 500;

     private static SimpleDateFormat YEAR_FORMAT = new SimpleDateFormat("yyyy", Locale.getDefault());
     private static SimpleDateFormat DAY_FORMAT = new SimpleDateFormat("dd", Locale.getDefault());

     private final Calendar mCalendar = Calendar.getInstance();
     private OnDateSetListener mCallBack;
     private HashSet<OnDateChangedListener> mListeners = new HashSet<OnDateChangedListener>();

     private ViewAnimator mAnimator;

     private TextView mDayOfWeekView;
     private LinearLayout mMonthAndDayView;
     private TextView mSelectedMonthTextView;
     private TextView mSelectedDayTextView;
     private TextView mYearView;
     private DayPickerView mDayPickerView;
     private YearPickerView mYearPickerView;
     private Button mDoneButton;

     private int mCurrentView = UNINITIALIZED;

     private int mWeekStart = mCalendar.getFirstDayOfWeek();
     private int mMinYear = DEFAULT_START_YEAR;
     private int mMaxYear = DEFAULT_END_YEAR;

     private Vibrator mVibrator;
     private long mLastVibrate;

     private boolean mDelayAnimation = true;

     /**
      * The callback used to indicate the user is done filling in the date.
      */
     public interface OnDateSetListener {

         /**
          * @param view The view associated with this listener.
          * @param year The year that was set.
          * @param monthOfYear The month that was set (0-11) for compatibility
          *            with {@link java.util.Calendar}.
          * @param dayOfMonth The day of the month that was set.
          */
         void onDateSet(DatePickerDialog dialog, int year, int monthOfYear, int dayOfMonth);
     }

     /**
      * The callback used to notify other date picker components of a change in selected date.
      */
     interface OnDateChangedListener {

         public void onDateChanged();
     }


     public DatePickerDialog() {
         // Empty constructor required for dialog fragment.
     }

     /**
      * @param callBack How the parent is notified that the date is set.
      * @param year The initial year of the dialog.
      * @param monthOfYear The initial month of the dialog.
      * @param dayOfMonth The initial day of the dialog.
      */
     public static DatePickerDialog newInstance(OnDateSetListener callBack, int year,
             int monthOfYear,
             int dayOfMonth) {
         DatePickerDialog ret = new DatePickerDialog();
         ret.initialize(callBack, year, monthOfYear, dayOfMonth);
         return ret;
     }

     public void initialize(OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
         mCallBack = callBack;
         mCalendar.set(Calendar.YEAR, year);
         mCalendar.set(Calendar.MONTH, monthOfYear);
         mCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         final Activity activity = getActivity();
         activity.getWindow().setSoftInputMode(
                 WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
         mVibrator = (Vibrator) activity.getSystemService(Context.VIBRATOR_SERVICE);
         if (savedInstanceState != null) {
             mCalendar.set(Calendar.YEAR, savedInstanceState.getInt(KEY_SELECTED_YEAR));
             mCalendar.set(Calendar.MONTH, savedInstanceState.getInt(KEY_SELECTED_MONTH));
             mCalendar.set(Calendar.DAY_OF_MONTH, savedInstanceState.getInt(KEY_SELECTED_DAY));
         }
     }

     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putInt(KEY_SELECTED_YEAR, mCalendar.get(Calendar.YEAR));
         outState.putInt(KEY_SELECTED_MONTH, mCalendar.get(Calendar.MONTH));
         outState.putInt(KEY_SELECTED_DAY, mCalendar.get(Calendar.DAY_OF_MONTH));
         outState.putInt(KEY_WEEK_START, mWeekStart);
         outState.putInt(KEY_YEAR_START, mMinYear);
         outState.putInt(KEY_YEAR_END, mMaxYear);
         outState.putInt(KEY_CURRENT_VIEW, mCurrentView);
         int listPosition = -1;
         if (mCurrentView == MONTH_AND_DAY_VIEW) {
             listPosition = mDayPickerView.getMostVisiblePosition();
         } else if (mCurrentView == YEAR_VIEW) {
             listPosition = mYearPickerView.getFirstVisiblePosition();
             outState.putInt(KEY_LIST_POSITION_OFFSET, mYearPickerView.getFirstPositionOffset());
         }
         outState.putInt(KEY_LIST_POSITION, listPosition);
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         Log.d(TAG, "onCreateView: ");
         getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);

         View view = inflater.inflate(R.layout.date_picker_dialog, null);

         mDayOfWeekView = (TextView) view.findViewById(R.id.date_picker_header);
         mMonthAndDayView = (LinearLayout) view.findViewById(R.id.date_picker_month_and_day);
         mMonthAndDayView.setOnClickListener(this);
         mSelectedMonthTextView = (TextView) view.findViewById(R.id.date_picker_month);
         mSelectedDayTextView = (TextView) view.findViewById(R.id.date_picker_day);
         mYearView = (TextView) view.findViewById(R.id.date_picker_year);
         mYearView.setOnClickListener(this);

         int listPosition = -1;
         int listPositionOffset = 0;
         int currentView = MONTH_AND_DAY_VIEW;
         if (savedInstanceState != null) {
             mWeekStart = savedInstanceState.getInt(KEY_WEEK_START);
             mMinYear = savedInstanceState.getInt(KEY_YEAR_START);
             mMaxYear = savedInstanceState.getInt(KEY_YEAR_END);
             currentView = savedInstanceState.getInt(KEY_CURRENT_VIEW);
             listPosition = savedInstanceState.getInt(KEY_LIST_POSITION);
             listPositionOffset = savedInstanceState.getInt(KEY_LIST_POSITION_OFFSET);
         }

         final Activity activity = getActivity();
         mDayPickerView = new DayPickerView(activity, this);
         mYearPickerView = new YearPickerView(activity, this);

         mAnimator = (ViewAnimator) view.findViewById(R.id.animator);
         mAnimator.addView(mDayPickerView);
         mAnimator.addView(mYearPickerView);
         // TODO: Replace with animation decided upon by the design team.
         Animation animation = new AlphaAnimation(0.0f, 1.0f);
         animation.setDuration(ANIMATION_DURATION);
         mAnimator.setInAnimation(animation);
         // TODO: Replace with animation decided upon by the design team.
         Animation animation2 = new AlphaAnimation(1.0f, 0.0f);
         animation2.setDuration(ANIMATION_DURATION);
         mAnimator.setOutAnimation(animation2);

         mDoneButton = (Button) view.findViewById(R.id.done);
         mDoneButton.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 tryVibrate();
                 if (mCallBack != null) {
                     mCallBack.onDateSet(DatePickerDialog.this, mCalendar.get(Calendar.YEAR),
                             mCalendar.get(Calendar.MONTH), mCalendar.get(Calendar.DAY_OF_MONTH));
                 }
                 dismiss();
             }
         });

         updateDisplay();
         setCurrentView(currentView);

         if (listPosition != -1) {
             if (currentView == MONTH_AND_DAY_VIEW) {
                 mDayPickerView.postSetSelection(listPosition);
             } else if (currentView == YEAR_VIEW) {
                 mYearPickerView.postSetSelectionFromTop(listPosition, listPositionOffset);
             }
         }
         return view;
     }

     private void setCurrentView(final int viewIndex) {
         switch (viewIndex) {
             case MONTH_AND_DAY_VIEW:
                 ObjectAnimator pulseAnimator = Utils.getPulseAnimator(mMonthAndDayView, 0.9f,
                         1.05f);
                 if (mDelayAnimation) {
                     pulseAnimator.setStartDelay(ANIMATION_DELAY);
                     mDelayAnimation = false;
                 }
                 mDayPickerView.onDateChanged();
                 if (mCurrentView != viewIndex) {
                     mMonthAndDayView.setSelected(true);
                     mYearView.setSelected(false);
                     mAnimator.setDisplayedChild(MONTH_AND_DAY_VIEW);
                     mCurrentView = viewIndex;
                 }
                 pulseAnimator.start();
                 break;
             case YEAR_VIEW:
                 pulseAnimator = Utils.getPulseAnimator(mYearView, 0.85f, 1.1f);
                 if (mDelayAnimation) {
                     pulseAnimator.setStartDelay(ANIMATION_DELAY);
                     mDelayAnimation = false;
                 }
                 mYearPickerView.onDateChanged();
                 if (mCurrentView != viewIndex) {
                     mMonthAndDayView.setSelected(false);
                     mYearView.setSelected(true);
                     mAnimator.setDisplayedChild(YEAR_VIEW);
                     mCurrentView = viewIndex;
                 }
                 pulseAnimator.start();
                 break;
         }
     }

     private void updateDisplay() {
         if (mDayOfWeekView != null) {
             mDayOfWeekView.setText(mCalendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG,
                     Locale.getDefault()).toUpperCase(Locale.getDefault()));
         }
         mSelectedMonthTextView.setText(mCalendar.getDisplayName(Calendar.MONTH, Calendar.SHORT,
                 Locale.getDefault()).toUpperCase(Locale.getDefault()));
         mSelectedDayTextView.setText(DAY_FORMAT.format(mCalendar.getTime()));
         mYearView.setText(YEAR_FORMAT.format(mCalendar.getTime()));
     }

     public void setFirstDayOfWeek(int startOfWeek) {
         if (startOfWeek < Calendar.SUNDAY || startOfWeek > Calendar.SATURDAY) {
             throw new IllegalArgumentException("Value must be between Calendar.SUNDAY and " +
                     "Calendar.SATURDAY");
         }
         mWeekStart = startOfWeek;
         if (mDayPickerView != null) {
             mDayPickerView.onChange();
         }
     }

     public void setYearRange(int startYear, int endYear) {
         if (endYear <= startYear) {
             throw new IllegalArgumentException("Year end must be larger than year start");
         }
         mMinYear = startYear;
         mMaxYear = endYear;
         if (mDayPickerView != null) {
             mDayPickerView.onChange();
         }
     }

     public void setOnDateSetListener(OnDateSetListener listener) {
         mCallBack = listener;
     }

     // If the newly selected month / year does not contain the currently selected day number,
     // change the selected day number to the last day of the selected month or year.
     //      e.g. Switching from Mar to Apr when Mar 31 is selected -> Apr 30
     //      e.g. Switching from 2012 to 2013 when Feb 29, 2012 is selected -> Feb 28, 2013
     private void adjustDayInMonthIfNeeded(int month, int year) {
         int day = mCalendar.get(Calendar.DAY_OF_MONTH);
         int daysInMonth = Utils.getDaysInMonth(month, year);
         if (day > daysInMonth) {
             mCalendar.set(Calendar.DAY_OF_MONTH, daysInMonth);
         }
     }

     @Override
     public void onClick(View v) {
         tryVibrate();
         if (v.getId() == R.id.date_picker_year) {
             setCurrentView(YEAR_VIEW);
         } else if (v.getId() == R.id.date_picker_month_and_day) {
             setCurrentView(MONTH_AND_DAY_VIEW);
         }
     }

     @Override
     public void onYearSelected(int year) {
         adjustDayInMonthIfNeeded(mCalendar.get(Calendar.MONTH), year);
         mCalendar.set(Calendar.YEAR, year);
         updatePickers();
         setCurrentView(MONTH_AND_DAY_VIEW);
         updateDisplay();
     }

     @Override
     public void onDayOfMonthSelected(int year, int month, int day) {
         mCalendar.set(Calendar.YEAR, year);
         mCalendar.set(Calendar.MONTH, month);
         mCalendar.set(Calendar.DAY_OF_MONTH, day);
         updatePickers();
         updateDisplay();
     }

     private void updatePickers() {
         Iterator<OnDateChangedListener> iterator = mListeners.iterator();
         while (iterator.hasNext()) {
             iterator.next().onDateChanged();
         }
     }


     @Override
     public CalendarDay getSelectedDay() {
         return new CalendarDay(mCalendar);
     }

     @Override
     public int getMinYear() {
         return mMinYear;
     }

     @Override
     public int getMaxYear() {
         return mMaxYear;
     }

     @Override
     public int getFirstDayOfWeek() {
         return mWeekStart;
     }

     @Override
     public void registerOnDateChangedListener(OnDateChangedListener listener) {
         mListeners.add(listener);
     }

     @Override
     public void unregisterOnDateChangedListener(OnDateChangedListener listener) {
         mListeners.remove(listener);
     }

     /**
      * Try to vibrate. To prevent this becoming a single continuous vibration, nothing will
      * happen if we have vibrated very recently.
      */
     @Override
     public void tryVibrate() {
         if (mVibrator != null) {
             long now = SystemClock.uptimeMillis();
             // We want to try to vibrate each individual tick discretely.
             if (now - mLastVibrate >= 125) {
                 mVibrator.vibrate(5);
                 mLastVibrate = now;
             }
         }
     }
 }
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.datetimepicker.date;

	import android.animation.ObjectAnimator;
	import android.app.Activity;
	import android.app.DialogFragment;
	import android.content.Context;
	import android.os.Bundle;
	import android.os.SystemClock;
	import android.os.Vibrator;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.view.ViewGroup;
	import android.view.Window;
	import android.view.WindowManager;
	import android.view.animation.AlphaAnimation;
	import android.view.animation.Animation;
	import android.widget.Button;
	import android.widget.LinearLayout;
	import android.widget.TextView;
	import android.widget.ViewAnimator;

	import com.android.datetimepicker.R;
	import com.android.datetimepicker.Utils;
	import com.android.datetimepicker.date.SimpleMonthAdapter.CalendarDay;

	import java.text.SimpleDateFormat;
	import java.util.Calendar;
	import java.util.HashSet;
	import java.util.Iterator;
	import java.util.Locale;

	/**
	* Dialog allowing users to select a date.
	*/
	public class DatePickerDialog extends DialogFragment implements
	OnClickListener, DatePickerController {

	private static final String TAG = "DatePickerDialog";

	private static final int UNINITIALIZED = -1;
	private static final int MONTH_AND_DAY_VIEW = 0;
	private static final int YEAR_VIEW = 1;

	private static final String KEY_SELECTED_YEAR = "year";
	private static final String KEY_SELECTED_MONTH = "month";
	private static final String KEY_SELECTED_DAY = "day";
	private static final String KEY_LIST_POSITION = "list_position";
	private static final String KEY_WEEK_START = "week_start";
	private static final String KEY_YEAR_START = "year_start";
	private static final String KEY_YEAR_END = "year_end";
	private static final String KEY_CURRENT_VIEW = "current_view";
	private static final String KEY_LIST_POSITION_OFFSET = "list_position_offset";

	private static final int DEFAULT_START_YEAR = 1900;
	private static final int DEFAULT_END_YEAR = 2100;

	private static final int ANIMATION_DURATION = 300;
	private static final int ANIMATION_DELAY = 500;

	private static SimpleDateFormat YEAR_FORMAT = new SimpleDateFormat("yyyy", Locale.getDefault());
	private static SimpleDateFormat DAY_FORMAT = new SimpleDateFormat("dd", Locale.getDefault());

	private final Calendar mCalendar = Calendar.getInstance();
	private OnDateSetListener mCallBack;
	private HashSet<OnDateChangedListener> mListeners = new HashSet<OnDateChangedListener>();

	private ViewAnimator mAnimator;

	private TextView mDayOfWeekView;
	private LinearLayout mMonthAndDayView;
	private TextView mSelectedMonthTextView;
	private TextView mSelectedDayTextView;
	private TextView mYearView;
	private DayPickerView mDayPickerView;
	private YearPickerView mYearPickerView;
	private Button mDoneButton;

	private int mCurrentView = UNINITIALIZED;

	private int mWeekStart = mCalendar.getFirstDayOfWeek();
	private int mMinYear = DEFAULT_START_YEAR;
	private int mMaxYear = DEFAULT_END_YEAR;

	private Vibrator mVibrator;
	private long mLastVibrate;

	private boolean mDelayAnimation = true;

	/**
	* The callback used to indicate the user is done filling in the date.
	*/
	public interface OnDateSetListener {

	/**
	* @param view The view associated with this listener.
	* @param year The year that was set.
	* @param monthOfYear The month that was set (0-11) for compatibility
	* with {@link java.util.Calendar}.
	* @param dayOfMonth The day of the month that was set.
	*/
	void onDateSet(DatePickerDialog dialog, int year, int monthOfYear, int dayOfMonth);
	}

	/**
	* The callback used to notify other date picker components of a change in selected date.
	*/
	interface OnDateChangedListener {

	public void onDateChanged();
	}


	public DatePickerDialog() {
	// Empty constructor required for dialog fragment.
	}

	/**
	* @param callBack How the parent is notified that the date is set.
	* @param year The initial year of the dialog.
	* @param monthOfYear The initial month of the dialog.
	* @param dayOfMonth The initial day of the dialog.
	*/
	public static DatePickerDialog newInstance(OnDateSetListener callBack, int year,
	int monthOfYear,
	int dayOfMonth) {
	DatePickerDialog ret = new DatePickerDialog();
	ret.initialize(callBack, year, monthOfYear, dayOfMonth);
	return ret;
	}

	public void initialize(OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
	mCallBack = callBack;
	mCalendar.set(Calendar.YEAR, year);
	mCalendar.set(Calendar.MONTH, monthOfYear);
	mCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	final Activity activity = getActivity();
	activity.getWindow().setSoftInputMode(
	WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
	mVibrator = (Vibrator) activity.getSystemService(Context.VIBRATOR_SERVICE);
	if (savedInstanceState != null) {
	mCalendar.set(Calendar.YEAR, savedInstanceState.getInt(KEY_SELECTED_YEAR));
	mCalendar.set(Calendar.MONTH, savedInstanceState.getInt(KEY_SELECTED_MONTH));
	mCalendar.set(Calendar.DAY_OF_MONTH, savedInstanceState.getInt(KEY_SELECTED_DAY));
	}
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	super.onSaveInstanceState(outState);
	outState.putInt(KEY_SELECTED_YEAR, mCalendar.get(Calendar.YEAR));
	outState.putInt(KEY_SELECTED_MONTH, mCalendar.get(Calendar.MONTH));
	outState.putInt(KEY_SELECTED_DAY, mCalendar.get(Calendar.DAY_OF_MONTH));
	outState.putInt(KEY_WEEK_START, mWeekStart);
	outState.putInt(KEY_YEAR_START, mMinYear);
	outState.putInt(KEY_YEAR_END, mMaxYear);
	outState.putInt(KEY_CURRENT_VIEW, mCurrentView);
	int listPosition = -1;
	if (mCurrentView == MONTH_AND_DAY_VIEW) {
	listPosition = mDayPickerView.getMostVisiblePosition();
	} else if (mCurrentView == YEAR_VIEW) {
	listPosition = mYearPickerView.getFirstVisiblePosition();
	outState.putInt(KEY_LIST_POSITION_OFFSET, mYearPickerView.getFirstPositionOffset());
	}
	outState.putInt(KEY_LIST_POSITION, listPosition);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	Log.d(TAG, "onCreateView: ");
	getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);

	View view = inflater.inflate(R.layout.date_picker_dialog, null);

	mDayOfWeekView = (TextView) view.findViewById(R.id.date_picker_header);
	mMonthAndDayView = (LinearLayout) view.findViewById(R.id.date_picker_month_and_day);
	mMonthAndDayView.setOnClickListener(this);
	mSelectedMonthTextView = (TextView) view.findViewById(R.id.date_picker_month);
	mSelectedDayTextView = (TextView) view.findViewById(R.id.date_picker_day);
	mYearView = (TextView) view.findViewById(R.id.date_picker_year);
	mYearView.setOnClickListener(this);

	int listPosition = -1;
	int listPositionOffset = 0;
	int currentView = MONTH_AND_DAY_VIEW;
	if (savedInstanceState != null) {
	mWeekStart = savedInstanceState.getInt(KEY_WEEK_START);
	mMinYear = savedInstanceState.getInt(KEY_YEAR_START);
	mMaxYear = savedInstanceState.getInt(KEY_YEAR_END);
	currentView = savedInstanceState.getInt(KEY_CURRENT_VIEW);
	listPosition = savedInstanceState.getInt(KEY_LIST_POSITION);
	listPositionOffset = savedInstanceState.getInt(KEY_LIST_POSITION_OFFSET);
	}

	final Activity activity = getActivity();
	mDayPickerView = new DayPickerView(activity, this);
	mYearPickerView = new YearPickerView(activity, this);

	mAnimator = (ViewAnimator) view.findViewById(R.id.animator);
	mAnimator.addView(mDayPickerView);
	mAnimator.addView(mYearPickerView);
	// TODO: Replace with animation decided upon by the design team.
	Animation animation = new AlphaAnimation(0.0f, 1.0f);
	animation.setDuration(ANIMATION_DURATION);
	mAnimator.setInAnimation(animation);
	// TODO: Replace with animation decided upon by the design team.
	Animation animation2 = new AlphaAnimation(1.0f, 0.0f);
	animation2.setDuration(ANIMATION_DURATION);
	mAnimator.setOutAnimation(animation2);

	mDoneButton = (Button) view.findViewById(R.id.done);
	mDoneButton.setOnClickListener(new OnClickListener() {

	@Override
	public void onClick(View v) {
	tryVibrate();
	if (mCallBack != null) {
	mCallBack.onDateSet(DatePickerDialog.this, mCalendar.get(Calendar.YEAR),
	mCalendar.get(Calendar.MONTH), mCalendar.get(Calendar.DAY_OF_MONTH));
	}
	dismiss();
	}
	});

	updateDisplay();
	setCurrentView(currentView);

	if (listPosition != -1) {
	if (currentView == MONTH_AND_DAY_VIEW) {
	mDayPickerView.postSetSelection(listPosition);
	} else if (currentView == YEAR_VIEW) {
	mYearPickerView.postSetSelectionFromTop(listPosition, listPositionOffset);
	}
	}
	return view;
	}

	private void setCurrentView(final int viewIndex) {
	switch (viewIndex) {
	case MONTH_AND_DAY_VIEW:
	ObjectAnimator pulseAnimator = Utils.getPulseAnimator(mMonthAndDayView, 0.9f,
	1.05f);
	if (mDelayAnimation) {
	pulseAnimator.setStartDelay(ANIMATION_DELAY);
	mDelayAnimation = false;
	}
	mDayPickerView.onDateChanged();
	if (mCurrentView != viewIndex) {
	mMonthAndDayView.setSelected(true);
	mYearView.setSelected(false);
	mAnimator.setDisplayedChild(MONTH_AND_DAY_VIEW);
	mCurrentView = viewIndex;
	}
	pulseAnimator.start();
	break;
	case YEAR_VIEW:
	pulseAnimator = Utils.getPulseAnimator(mYearView, 0.85f, 1.1f);
	if (mDelayAnimation) {
	pulseAnimator.setStartDelay(ANIMATION_DELAY);
	mDelayAnimation = false;
	}
	mYearPickerView.onDateChanged();
	if (mCurrentView != viewIndex) {
	mMonthAndDayView.setSelected(false);
	mYearView.setSelected(true);
	mAnimator.setDisplayedChild(YEAR_VIEW);
	mCurrentView = viewIndex;
	}
	pulseAnimator.start();
	break;
	}
	}

	private void updateDisplay() {
	if (mDayOfWeekView != null) {
	mDayOfWeekView.setText(mCalendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG,
	Locale.getDefault()).toUpperCase(Locale.getDefault()));
	}
	mSelectedMonthTextView.setText(mCalendar.getDisplayName(Calendar.MONTH, Calendar.SHORT,
	Locale.getDefault()).toUpperCase(Locale.getDefault()));
	mSelectedDayTextView.setText(DAY_FORMAT.format(mCalendar.getTime()));
	mYearView.setText(YEAR_FORMAT.format(mCalendar.getTime()));
	}

	public void setFirstDayOfWeek(int startOfWeek) {
	if (startOfWeek < Calendar.SUNDAY \|\| startOfWeek > Calendar.SATURDAY) {
	throw new IllegalArgumentException("Value must be between Calendar.SUNDAY and " +
	"Calendar.SATURDAY");
	}
	mWeekStart = startOfWeek;
	if (mDayPickerView != null) {
	mDayPickerView.onChange();
	}
	}

	public void setYearRange(int startYear, int endYear) {
	if (endYear <= startYear) {
	throw new IllegalArgumentException("Year end must be larger than year start");
	}
	mMinYear = startYear;
	mMaxYear = endYear;
	if (mDayPickerView != null) {
	mDayPickerView.onChange();
	}
	}

	public void setOnDateSetListener(OnDateSetListener listener) {
	mCallBack = listener;
	}

	// If the newly selected month / year does not contain the currently selected day number,
	// change the selected day number to the last day of the selected month or year.
	// e.g. Switching from Mar to Apr when Mar 31 is selected -> Apr 30
	// e.g. Switching from 2012 to 2013 when Feb 29, 2012 is selected -> Feb 28, 2013
	private void adjustDayInMonthIfNeeded(int month, int year) {
	int day = mCalendar.get(Calendar.DAY_OF_MONTH);
	int daysInMonth = Utils.getDaysInMonth(month, year);
	if (day > daysInMonth) {
	mCalendar.set(Calendar.DAY_OF_MONTH, daysInMonth);
	}
	}

	@Override
	public void onClick(View v) {
	tryVibrate();
	if (v.getId() == R.id.date_picker_year) {
	setCurrentView(YEAR_VIEW);
	} else if (v.getId() == R.id.date_picker_month_and_day) {
	setCurrentView(MONTH_AND_DAY_VIEW);
	}
	}

	@Override
	public void onYearSelected(int year) {
	adjustDayInMonthIfNeeded(mCalendar.get(Calendar.MONTH), year);
	mCalendar.set(Calendar.YEAR, year);
	updatePickers();
	setCurrentView(MONTH_AND_DAY_VIEW);
	updateDisplay();
	}

	@Override
	public void onDayOfMonthSelected(int year, int month, int day) {
	mCalendar.set(Calendar.YEAR, year);
	mCalendar.set(Calendar.MONTH, month);
	mCalendar.set(Calendar.DAY_OF_MONTH, day);
	updatePickers();
	updateDisplay();
	}

	private void updatePickers() {
	Iterator<OnDateChangedListener> iterator = mListeners.iterator();
	while (iterator.hasNext()) {
	iterator.next().onDateChanged();
	}
	}


	@Override
	public CalendarDay getSelectedDay() {
	return new CalendarDay(mCalendar);
	}

	@Override
	public int getMinYear() {
	return mMinYear;
	}

	@Override
	public int getMaxYear() {
	return mMaxYear;
	}

	@Override
	public int getFirstDayOfWeek() {
	return mWeekStart;
	}

	@Override
	public void registerOnDateChangedListener(OnDateChangedListener listener) {
	mListeners.add(listener);
	}

	@Override
	public void unregisterOnDateChangedListener(OnDateChangedListener listener) {
	mListeners.remove(listener);
	}

	/**
	* Try to vibrate. To prevent this becoming a single continuous vibration, nothing will
	* happen if we have vibrated very recently.
	*/
	@Override
	public void tryVibrate() {
	if (mVibrator != null) {
	long now = SystemClock.uptimeMillis();
	// We want to try to vibrate each individual tick discretely.
	if (now - mLastVibrate >= 125) {
	mVibrator.vibrate(5);
	mLastVibrate = now;
	}
	}
	}
	}