src/com/android/calendar/month/SimpleDayPickerFragment.java - platform/packages/apps/Calendar - Git at Google

 /*
  * Copyright (C) 2010 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.calendar.month;

 import com.android.calendar.R;
 import com.android.calendar.Utils;

 import android.app.Activity;
 import android.app.ListFragment;
 import android.content.Context;
 import android.content.res.Resources;
 import android.database.DataSetObserver;
 import android.os.Bundle;
 import android.os.Handler;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
 import android.text.format.Time;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.ViewGroup;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.AbsListView;
 import android.widget.AbsListView.OnScrollListener;
 import android.widget.ListView;
 import android.widget.TextView;

 import java.util.Calendar;
 import java.util.HashMap;
 import java.util.Locale;

 /**
  * <p>
  * This displays a titled list of weeks with selectable days. It can be
  * configured to display the week number, start the week on a given day, show a
  * reduced number of days, or display an arbitrary number of weeks at a time. By
  * overriding methods and changing variables this fragment can be customized to
  * easily display a month selection component in a given style.
  * </p>
  */
 public class SimpleDayPickerFragment extends ListFragment implements OnScrollListener {

     private static final String TAG = "MonthFragment";
     private static final String KEY_CURRENT_TIME = "current_time";

     // Affects when the month selection will change while scrolling up
     protected static final int SCROLL_HYST_WEEKS = 2;
     // How long the GoTo fling animation should last
     protected static final int GOTO_SCROLL_DURATION = 500;
     // How long to wait after receiving an onScrollStateChanged notification
     // before acting on it
     protected static final int SCROLL_CHANGE_DELAY = 40;
     // The number of days to display in each week
     public static final int DAYS_PER_WEEK = 7;
     // The size of the month name displayed above the week list
     protected static final int MINI_MONTH_NAME_TEXT_SIZE = 18;
     public static int LIST_TOP_OFFSET = -1;  // so that the top line will be under the separator
     protected int WEEK_MIN_VISIBLE_HEIGHT = 12;
     protected int BOTTOM_BUFFER = 20;
     protected int mSaturdayColor = 0;
     protected int mSundayColor = 0;
     protected int mDayNameColor = 0;

     // You can override these numbers to get a different appearance
     protected int mNumWeeks = 6;
     protected boolean mShowWeekNumber = false;
     protected int mDaysPerWeek = 7;

     // These affect the scroll speed and feel
     protected float mFriction = 1.0f;

     protected Context mContext;
     protected Handler mHandler;

     protected float mMinimumFlingVelocity;

     // highlighted time
     protected Time mSelectedDay = new Time();
     protected SimpleWeeksAdapter mAdapter;
     protected ListView mListView;
     protected ViewGroup mDayNamesHeader;
     protected String[] mDayLabels;

     // disposable variable used for time calculations
     protected Time mTempTime = new Time();

     private static float mScale = 0;
     // When the week starts; numbered like Time.<WEEKDAY> (e.g. SUNDAY=0).
     protected int mFirstDayOfWeek;
     // The first day of the focus month
     protected Time mFirstDayOfMonth = new Time();
     // The first day that is visible in the view
     protected Time mFirstVisibleDay = new Time();
     // The name of the month to display
     protected TextView mMonthName;
     // The last name announced by accessibility
     protected CharSequence mPrevMonthName;
     // which month should be displayed/highlighted [0-11]
     protected int mCurrentMonthDisplayed;
     // used for tracking during a scroll
     protected long mPreviousScrollPosition;
     // used for tracking which direction the view is scrolling
     protected boolean mIsScrollingUp = false;
     // used for tracking what state listview is in
     protected int mPreviousScrollState = OnScrollListener.SCROLL_STATE_IDLE;
     // used for tracking what state listview is in
     protected int mCurrentScrollState = OnScrollListener.SCROLL_STATE_IDLE;

     // This causes an update of the view at midnight
     protected Runnable mTodayUpdater = new Runnable() {
         @Override
         public void run() {
             Time midnight = new Time(mFirstVisibleDay.timezone);
             midnight.setToNow();
             long currentMillis = midnight.toMillis(true);

             midnight.hour = 0;
             midnight.minute = 0;
             midnight.second = 0;
             midnight.monthDay++;
             long millisToMidnight = midnight.normalize(true) - currentMillis;
             mHandler.postDelayed(this, millisToMidnight);

             if (mAdapter != null) {
                 mAdapter.notifyDataSetChanged();
             }
         }
     };

     // This allows us to update our position when a day is tapped
     protected DataSetObserver mObserver = new DataSetObserver() {
         @Override
         public void onChanged() {
             Time day = mAdapter.getSelectedDay();
             if (day.year != mSelectedDay.year || day.yearDay != mSelectedDay.yearDay) {
                 goTo(day.toMillis(true), true, true, false);
             }
         }
     };

     public SimpleDayPickerFragment(long initialTime) {
         goTo(initialTime, false, true, true);
         mHandler = new Handler();
     }

     @Override
     public void onAttach(Activity activity) {
         super.onAttach(activity);
         mContext = activity;
         String tz = Time.getCurrentTimezone();
         ViewConfiguration viewConfig = ViewConfiguration.get(activity);
         mMinimumFlingVelocity = viewConfig.getScaledMinimumFlingVelocity();

         // Ensure we're in the correct time zone
         mSelectedDay.switchTimezone(tz);
         mSelectedDay.normalize(true);
         mFirstDayOfMonth.timezone = tz;
         mFirstDayOfMonth.normalize(true);
         mFirstVisibleDay.timezone = tz;
         mFirstVisibleDay.normalize(true);
         mTempTime.timezone = tz;

         Resources res = activity.getResources();
         mSaturdayColor = res.getColor(R.color.month_saturday);
         mSundayColor = res.getColor(R.color.month_sunday);
         mDayNameColor = res.getColor(R.color.month_day_names_color);

         // Adjust sizes for screen density
         if (mScale == 0) {
             mScale = activity.getResources().getDisplayMetrics().density;
             if (mScale != 1) {
                 WEEK_MIN_VISIBLE_HEIGHT *= mScale;
                 BOTTOM_BUFFER *= mScale;
                 LIST_TOP_OFFSET *= mScale;
             }
         }
         setUpAdapter();
         setListAdapter(mAdapter);
     }

     /**
      * Creates a new adapter if necessary and sets up its parameters. Override
      * this method to provide a custom adapter.
      */
     protected void setUpAdapter() {
         HashMap<String, Integer> weekParams = new HashMap<String, Integer>();
         weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_NUM_WEEKS, mNumWeeks);
         weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_SHOW_WEEK, mShowWeekNumber ? 1 : 0);
         weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_WEEK_START, mFirstDayOfWeek);
         weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_JULIAN_DAY,
                 Time.getJulianDay(mSelectedDay.toMillis(false), mSelectedDay.gmtoff));
         if (mAdapter == null) {
             mAdapter = new SimpleWeeksAdapter(getActivity(), weekParams);
             mAdapter.registerDataSetObserver(mObserver);
         } else {
             mAdapter.updateParams(weekParams);
         }
         // refresh the view with the new parameters
         mAdapter.notifyDataSetChanged();
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
     }

     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);

         setUpListView();
         setUpHeader();

         mMonthName = (TextView) getView().findViewById(R.id.month_name);
         SimpleWeekView child = (SimpleWeekView) mListView.getChildAt(0);
         if (child == null) {
             return;
         }
         int julianDay = child.getFirstJulianDay();
         mFirstVisibleDay.setJulianDay(julianDay);
         // set the title to the month of the second week
         mTempTime.setJulianDay(julianDay + DAYS_PER_WEEK);
         setMonthDisplayed(mTempTime, true);
     }

     /**
      * Sets up the strings to be used by the header. Override this method to use
      * different strings or modify the view params.
      */
     protected void setUpHeader() {
         mDayLabels = new String[7];
         for (int i = Calendar.SUNDAY; i <= Calendar.SATURDAY; i++) {
             mDayLabels[i - Calendar.SUNDAY] = DateUtils.getDayOfWeekString(i,
                     DateUtils.LENGTH_SHORTEST).toUpperCase();
         }
     }

     /**
      * Sets all the required fields for the list view. Override this method to
      * set a different list view behavior.
      */
     protected void setUpListView() {
         // Configure the listview
         mListView = getListView();
         // Transparent background on scroll
         mListView.setCacheColorHint(0);
         // No dividers
         mListView.setDivider(null);
         // Items are clickable
         mListView.setItemsCanFocus(true);
         // The thumb gets in the way, so disable it
         mListView.setFastScrollEnabled(false);
         mListView.setVerticalScrollBarEnabled(false);
         mListView.setOnScrollListener(this);
         mListView.setFadingEdgeLength(0);
         // Make the scrolling behavior nicer
         mListView.setFriction(ViewConfiguration.getScrollFriction() * mFriction);
     }

     @Override
     public void onResume() {
         super.onResume();
         setUpAdapter();
         doResumeUpdates();
     }

     @Override
     public void onPause() {
         super.onPause();
         mHandler.removeCallbacks(mTodayUpdater);
     }

     @Override
     public void onSaveInstanceState(Bundle outState) {
         outState.putLong(KEY_CURRENT_TIME, mSelectedDay.toMillis(true));
     }

     /**
      * Updates the user preference fields. Override this to use a different
      * preference space.
      */
     protected void doResumeUpdates() {
         // Get default week start based on locale, subtracting one for use with android Time.
         Calendar cal = Calendar.getInstance(Locale.getDefault());
         mFirstDayOfWeek = cal.getFirstDayOfWeek() - 1;

         mShowWeekNumber = false;

         updateHeader();
         goTo(mSelectedDay.toMillis(true), false, false, false);
         mAdapter.setSelectedDay(mSelectedDay);
         mTodayUpdater.run();
     }

     /**
      * Fixes the day names header to provide correct spacing and updates the
      * label text. Override this to set up a custom header.
      */
     protected void updateHeader() {
         TextView label = (TextView) mDayNamesHeader.findViewById(R.id.wk_label);
         if (mShowWeekNumber) {
             label.setVisibility(View.VISIBLE);
         } else {
             label.setVisibility(View.GONE);
         }
         int offset = mFirstDayOfWeek - 1;
         for (int i = 1; i < 8; i++) {
             label = (TextView) mDayNamesHeader.getChildAt(i);
             if (i < mDaysPerWeek + 1) {
                 int position = (offset + i) % 7;
                 label.setText(mDayLabels[position]);
                 label.setVisibility(View.VISIBLE);
                 if (position == Time.SATURDAY) {
                     label.setTextColor(mSaturdayColor);
                 } else if (position == Time.SUNDAY) {
                     label.setTextColor(mSundayColor);
                 } else {
                     label.setTextColor(mDayNameColor);
                 }
             } else {
                 label.setVisibility(View.GONE);
             }
         }
         mDayNamesHeader.invalidate();
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.month_by_week,
                 container, false);
         mDayNamesHeader = (ViewGroup) v.findViewById(R.id.day_names);
         return v;
     }

     /**
      * Returns the UTC millis since epoch representation of the currently
      * selected time.
      *
      * @return
      */
     public long getSelectedTime() {
         return mSelectedDay.toMillis(true);
     }

     /**
      * This moves to the specified time in the view. If the time is not already
      * in range it will move the list so that the first of the month containing
      * the time is at the top of the view. If the new time is already in view
      * the list will not be scrolled unless forceScroll is true. This time may
      * optionally be highlighted as selected as well.
      *
      * @param time The time to move to
      * @param animate Whether to scroll to the given time or just redraw at the
      *            new location
      * @param setSelected Whether to set the given time as selected
      * @param forceScroll Whether to recenter even if the time is already
      *            visible
      * @return Whether or not the view animated to the new location
      */
     public boolean goTo(long time, boolean animate, boolean setSelected, boolean forceScroll) {
         if (time == -1) {
             Log.e(TAG, "time is invalid");
             return false;
         }

         // Set the selected day
         if (setSelected) {
             mSelectedDay.set(time);
             mSelectedDay.normalize(true);
         }

         // If this view isn't returned yet we won't be able to load the lists
         // current position, so return after setting the selected day.
         if (!isResumed()) {
             if (Log.isLoggable(TAG, Log.DEBUG)) {
                 Log.d(TAG, "We're not visible yet");
             }
             return false;
         }

         mTempTime.set(time);
         long millis = mTempTime.normalize(true);
         // Get the week we're going to
         // TODO push Util function into Calendar public api.
         int position = Utils.getWeeksSinceEpochFromJulianDay(
                 Time.getJulianDay(millis, mTempTime.gmtoff), mFirstDayOfWeek);

         View child;
         int i = 0;
         int top = 0;
         // Find a child that's completely in the view
         do {
             child = mListView.getChildAt(i++);
             if (child == null) {
                 break;
             }
             top = child.getTop();
             if (Log.isLoggable(TAG, Log.DEBUG)) {
                 Log.d(TAG, "child at " + (i-1) + " has top " + top);
             }
         } while (top < 0);

         // Compute the first and last position visible
         int firstPosition;
         if (child != null) {
             firstPosition = mListView.getPositionForView(child);
         } else {
             firstPosition = 0;
         }
         int lastPosition = firstPosition + mNumWeeks - 1;
         if (top > BOTTOM_BUFFER) {
             lastPosition--;
         }

         if (setSelected) {
             mAdapter.setSelectedDay(mSelectedDay);
         }

         if (Log.isLoggable(TAG, Log.DEBUG)) {
             Log.d(TAG, "GoTo position " + position);
         }
         // Check if the selected day is now outside of our visible range
         // and if so scroll to the month that contains it
         if (position < firstPosition || position > lastPosition || forceScroll) {
             mFirstDayOfMonth.set(mTempTime);
             mFirstDayOfMonth.monthDay = 1;
             millis = mFirstDayOfMonth.normalize(true);
             setMonthDisplayed(mFirstDayOfMonth, true);
             position = Utils.getWeeksSinceEpochFromJulianDay(
                     Time.getJulianDay(millis, mFirstDayOfMonth.gmtoff), mFirstDayOfWeek);

             mPreviousScrollState = OnScrollListener.SCROLL_STATE_FLING;
             if (animate) {
                 mListView.smoothScrollToPositionFromTop(
                         position, LIST_TOP_OFFSET, GOTO_SCROLL_DURATION);
                 return true;
             } else {
                 mListView.setSelectionFromTop(position, LIST_TOP_OFFSET);
                 // Perform any after scroll operations that are needed
                 onScrollStateChanged(mListView, OnScrollListener.SCROLL_STATE_IDLE);
             }
         } else if (setSelected) {
             // Otherwise just set the selection
             setMonthDisplayed(mSelectedDay, true);
         }
         return false;
     }

      /**
      * Updates the title and selected month if the view has moved to a new
      * month.
      */
     @Override
     public void onScroll(
             AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
         SimpleWeekView child = (SimpleWeekView)view.getChildAt(0);
         if (child == null) {
             return;
         }

         // Figure out where we are
         long currScroll = view.getFirstVisiblePosition() * child.getHeight() - child.getBottom();
         mFirstVisibleDay.setJulianDay(child.getFirstJulianDay());

         // If we have moved since our last call update the direction
         if (currScroll < mPreviousScrollPosition) {
             mIsScrollingUp = true;
         } else if (currScroll > mPreviousScrollPosition) {
             mIsScrollingUp = false;
         } else {
             return;
         }

         mPreviousScrollPosition = currScroll;
         mPreviousScrollState = mCurrentScrollState;

         updateMonthHighlight(mListView);
     }

     /**
      * Figures out if the month being shown has changed and updates the
      * highlight if needed
      *
      * @param view The ListView containing the weeks
      */
     private void updateMonthHighlight(AbsListView view) {
         SimpleWeekView child = (SimpleWeekView) view.getChildAt(0);
         if (child == null) {
             return;
         }

         // Figure out where we are
         int offset = child.getBottom() < WEEK_MIN_VISIBLE_HEIGHT ? 1 : 0;
         // Use some hysteresis for checking which month to highlight. This
         // causes the month to transition when two full weeks of a month are
         // visible.
         child = (SimpleWeekView) view.getChildAt(SCROLL_HYST_WEEKS + offset);

         if (child == null) {
             return;
         }

         // Find out which month we're moving into
         int month;
         if (mIsScrollingUp) {
             month = child.getFirstMonth();
         } else {
             month = child.getLastMonth();
         }

         // And how it relates to our current highlighted month
         int monthDiff;
         if (mCurrentMonthDisplayed == 11 && month == 0) {
             monthDiff = 1;
         } else if (mCurrentMonthDisplayed == 0 && month == 11) {
             monthDiff = -1;
         } else {
             monthDiff = month - mCurrentMonthDisplayed;
         }

         // Only switch months if we're scrolling away from the currently
         // selected month
         if (monthDiff != 0) {
             int julianDay = child.getFirstJulianDay();
             if (mIsScrollingUp) {
                 // Takes the start of the week
             } else {
                 // Takes the start of the following week
                 julianDay += DAYS_PER_WEEK;
             }
             mTempTime.setJulianDay(julianDay);
             setMonthDisplayed(mTempTime, false);
         }
     }

     /**
      * Sets the month displayed at the top of this view based on time. Override
      * to add custom events when the title is changed.
      *
      * @param time A day in the new focus month.
      * @param updateHighlight TODO(epastern):
      */
     protected void setMonthDisplayed(Time time, boolean updateHighlight) {
         CharSequence oldMonth = mMonthName.getText();
         mMonthName.setText(Utils.formatMonthYear(mContext, time));
         mMonthName.invalidate();
         if (!TextUtils.equals(oldMonth, mMonthName.getText())) {
             mMonthName.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
         }
         mCurrentMonthDisplayed = time.month;
         if (updateHighlight) {
             mAdapter.updateFocusMonth(mCurrentMonthDisplayed);
         }
     }

     @Override
     public void onScrollStateChanged(AbsListView view, int scrollState) {
         // use a post to prevent re-entering onScrollStateChanged before it
         // exits
         mScrollStateChangedRunnable.doScrollStateChange(view, scrollState);
     }

     protected ScrollStateRunnable mScrollStateChangedRunnable = new ScrollStateRunnable();

     protected class ScrollStateRunnable implements Runnable {
         private int mNewState;

         /**
          * Sets up the runnable with a short delay in case the scroll state
          * immediately changes again.
          *
          * @param view The list view that changed state
          * @param scrollState The new state it changed to
          */
         public void doScrollStateChange(AbsListView view, int scrollState) {
             mHandler.removeCallbacks(this);
             mNewState = scrollState;
             mHandler.postDelayed(this, SCROLL_CHANGE_DELAY);
         }

         public void run() {
             mCurrentScrollState = mNewState;
             if (Log.isLoggable(TAG, Log.DEBUG)) {
                 Log.d(TAG,
                         "new scroll state: " + mNewState + " old state: " + mPreviousScrollState);
             }
             // Fix the position after a scroll or a fling ends
             if (mNewState == OnScrollListener.SCROLL_STATE_IDLE
                     && mPreviousScrollState != OnScrollListener.SCROLL_STATE_IDLE) {
                 mPreviousScrollState = mNewState;
                 mAdapter.updateFocusMonth(mCurrentMonthDisplayed);
             } else {
                 mPreviousScrollState = mNewState;
             }
         }
     }
 }
	/*
	* Copyright (C) 2010 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.calendar.month;

	import com.android.calendar.R;
	import com.android.calendar.Utils;

	import android.app.Activity;
	import android.app.ListFragment;
	import android.content.Context;
	import android.content.res.Resources;
	import android.database.DataSetObserver;
	import android.os.Bundle;
	import android.os.Handler;
	import android.text.TextUtils;
	import android.text.format.DateUtils;
	import android.text.format.Time;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewConfiguration;
	import android.view.ViewGroup;
	import android.view.accessibility.AccessibilityEvent;
	import android.widget.AbsListView;
	import android.widget.AbsListView.OnScrollListener;
	import android.widget.ListView;
	import android.widget.TextView;

	import java.util.Calendar;
	import java.util.HashMap;
	import java.util.Locale;

	/**
	* <p>
	* This displays a titled list of weeks with selectable days. It can be
	* configured to display the week number, start the week on a given day, show a
	* reduced number of days, or display an arbitrary number of weeks at a time. By
	* overriding methods and changing variables this fragment can be customized to
	* easily display a month selection component in a given style.
	* </p>
	*/
	public class SimpleDayPickerFragment extends ListFragment implements OnScrollListener {

	private static final String TAG = "MonthFragment";
	private static final String KEY_CURRENT_TIME = "current_time";

	// Affects when the month selection will change while scrolling up
	protected static final int SCROLL_HYST_WEEKS = 2;
	// How long the GoTo fling animation should last
	protected static final int GOTO_SCROLL_DURATION = 500;
	// How long to wait after receiving an onScrollStateChanged notification
	// before acting on it
	protected static final int SCROLL_CHANGE_DELAY = 40;
	// The number of days to display in each week
	public static final int DAYS_PER_WEEK = 7;
	// The size of the month name displayed above the week list
	protected static final int MINI_MONTH_NAME_TEXT_SIZE = 18;
	public static int LIST_TOP_OFFSET = -1; // so that the top line will be under the separator
	protected int WEEK_MIN_VISIBLE_HEIGHT = 12;
	protected int BOTTOM_BUFFER = 20;
	protected int mSaturdayColor = 0;
	protected int mSundayColor = 0;
	protected int mDayNameColor = 0;

	// You can override these numbers to get a different appearance
	protected int mNumWeeks = 6;
	protected boolean mShowWeekNumber = false;
	protected int mDaysPerWeek = 7;

	// These affect the scroll speed and feel
	protected float mFriction = 1.0f;

	protected Context mContext;
	protected Handler mHandler;

	protected float mMinimumFlingVelocity;

	// highlighted time
	protected Time mSelectedDay = new Time();
	protected SimpleWeeksAdapter mAdapter;
	protected ListView mListView;
	protected ViewGroup mDayNamesHeader;
	protected String[] mDayLabels;

	// disposable variable used for time calculations
	protected Time mTempTime = new Time();

	private static float mScale = 0;
	// When the week starts; numbered like Time.<WEEKDAY> (e.g. SUNDAY=0).
	protected int mFirstDayOfWeek;
	// The first day of the focus month
	protected Time mFirstDayOfMonth = new Time();
	// The first day that is visible in the view
	protected Time mFirstVisibleDay = new Time();
	// The name of the month to display
	protected TextView mMonthName;
	// The last name announced by accessibility
	protected CharSequence mPrevMonthName;
	// which month should be displayed/highlighted [0-11]
	protected int mCurrentMonthDisplayed;
	// used for tracking during a scroll
	protected long mPreviousScrollPosition;
	// used for tracking which direction the view is scrolling
	protected boolean mIsScrollingUp = false;
	// used for tracking what state listview is in
	protected int mPreviousScrollState = OnScrollListener.SCROLL_STATE_IDLE;
	// used for tracking what state listview is in
	protected int mCurrentScrollState = OnScrollListener.SCROLL_STATE_IDLE;

	// This causes an update of the view at midnight
	protected Runnable mTodayUpdater = new Runnable() {
	@Override
	public void run() {
	Time midnight = new Time(mFirstVisibleDay.timezone);
	midnight.setToNow();
	long currentMillis = midnight.toMillis(true);

	midnight.hour = 0;
	midnight.minute = 0;
	midnight.second = 0;
	midnight.monthDay++;
	long millisToMidnight = midnight.normalize(true) - currentMillis;
	mHandler.postDelayed(this, millisToMidnight);

	if (mAdapter != null) {
	mAdapter.notifyDataSetChanged();
	}
	}
	};

	// This allows us to update our position when a day is tapped
	protected DataSetObserver mObserver = new DataSetObserver() {
	@Override
	public void onChanged() {
	Time day = mAdapter.getSelectedDay();
	if (day.year != mSelectedDay.year \|\| day.yearDay != mSelectedDay.yearDay) {
	goTo(day.toMillis(true), true, true, false);
	}
	}
	};

	public SimpleDayPickerFragment(long initialTime) {
	goTo(initialTime, false, true, true);
	mHandler = new Handler();
	}

	@Override
	public void onAttach(Activity activity) {
	super.onAttach(activity);
	mContext = activity;
	String tz = Time.getCurrentTimezone();
	ViewConfiguration viewConfig = ViewConfiguration.get(activity);
	mMinimumFlingVelocity = viewConfig.getScaledMinimumFlingVelocity();

	// Ensure we're in the correct time zone
	mSelectedDay.switchTimezone(tz);
	mSelectedDay.normalize(true);
	mFirstDayOfMonth.timezone = tz;
	mFirstDayOfMonth.normalize(true);
	mFirstVisibleDay.timezone = tz;
	mFirstVisibleDay.normalize(true);
	mTempTime.timezone = tz;

	Resources res = activity.getResources();
	mSaturdayColor = res.getColor(R.color.month_saturday);
	mSundayColor = res.getColor(R.color.month_sunday);
	mDayNameColor = res.getColor(R.color.month_day_names_color);

	// Adjust sizes for screen density
	if (mScale == 0) {
	mScale = activity.getResources().getDisplayMetrics().density;
	if (mScale != 1) {
	WEEK_MIN_VISIBLE_HEIGHT *= mScale;
	BOTTOM_BUFFER *= mScale;
	LIST_TOP_OFFSET *= mScale;
	}
	}
	setUpAdapter();
	setListAdapter(mAdapter);
	}

	/**
	* Creates a new adapter if necessary and sets up its parameters. Override
	* this method to provide a custom adapter.
	*/
	protected void setUpAdapter() {
	HashMap<String, Integer> weekParams = new HashMap<String, Integer>();
	weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_NUM_WEEKS, mNumWeeks);
	weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_SHOW_WEEK, mShowWeekNumber ? 1 : 0);
	weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_WEEK_START, mFirstDayOfWeek);
	weekParams.put(SimpleWeeksAdapter.WEEK_PARAMS_JULIAN_DAY,
	Time.getJulianDay(mSelectedDay.toMillis(false), mSelectedDay.gmtoff));
	if (mAdapter == null) {
	mAdapter = new SimpleWeeksAdapter(getActivity(), weekParams);
	mAdapter.registerDataSetObserver(mObserver);
	} else {
	mAdapter.updateParams(weekParams);
	}
	// refresh the view with the new parameters
	mAdapter.notifyDataSetChanged();
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);

	setUpListView();
	setUpHeader();

	mMonthName = (TextView) getView().findViewById(R.id.month_name);
	SimpleWeekView child = (SimpleWeekView) mListView.getChildAt(0);
	if (child == null) {
	return;
	}
	int julianDay = child.getFirstJulianDay();
	mFirstVisibleDay.setJulianDay(julianDay);
	// set the title to the month of the second week
	mTempTime.setJulianDay(julianDay + DAYS_PER_WEEK);
	setMonthDisplayed(mTempTime, true);
	}

	/**
	* Sets up the strings to be used by the header. Override this method to use
	* different strings or modify the view params.
	*/
	protected void setUpHeader() {
	mDayLabels = new String[7];
	for (int i = Calendar.SUNDAY; i <= Calendar.SATURDAY; i++) {
	mDayLabels[i - Calendar.SUNDAY] = DateUtils.getDayOfWeekString(i,
	DateUtils.LENGTH_SHORTEST).toUpperCase();
	}
	}

	/**
	* Sets all the required fields for the list view. Override this method to
	* set a different list view behavior.
	*/
	protected void setUpListView() {
	// Configure the listview
	mListView = getListView();
	// Transparent background on scroll
	mListView.setCacheColorHint(0);
	// No dividers
	mListView.setDivider(null);
	// Items are clickable
	mListView.setItemsCanFocus(true);
	// The thumb gets in the way, so disable it
	mListView.setFastScrollEnabled(false);
	mListView.setVerticalScrollBarEnabled(false);
	mListView.setOnScrollListener(this);
	mListView.setFadingEdgeLength(0);
	// Make the scrolling behavior nicer
	mListView.setFriction(ViewConfiguration.getScrollFriction() * mFriction);
	}

	@Override
	public void onResume() {
	super.onResume();
	setUpAdapter();
	doResumeUpdates();
	}

	@Override
	public void onPause() {
	super.onPause();
	mHandler.removeCallbacks(mTodayUpdater);
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	outState.putLong(KEY_CURRENT_TIME, mSelectedDay.toMillis(true));
	}

	/**
	* Updates the user preference fields. Override this to use a different
	* preference space.
	*/
	protected void doResumeUpdates() {
	// Get default week start based on locale, subtracting one for use with android Time.
	Calendar cal = Calendar.getInstance(Locale.getDefault());
	mFirstDayOfWeek = cal.getFirstDayOfWeek() - 1;

	mShowWeekNumber = false;

	updateHeader();
	goTo(mSelectedDay.toMillis(true), false, false, false);
	mAdapter.setSelectedDay(mSelectedDay);
	mTodayUpdater.run();
	}

	/**
	* Fixes the day names header to provide correct spacing and updates the
	* label text. Override this to set up a custom header.
	*/
	protected void updateHeader() {
	TextView label = (TextView) mDayNamesHeader.findViewById(R.id.wk_label);
	if (mShowWeekNumber) {
	label.setVisibility(View.VISIBLE);
	} else {
	label.setVisibility(View.GONE);
	}
	int offset = mFirstDayOfWeek - 1;
	for (int i = 1; i < 8; i++) {
	label = (TextView) mDayNamesHeader.getChildAt(i);
	if (i < mDaysPerWeek + 1) {
	int position = (offset + i) % 7;
	label.setText(mDayLabels[position]);
	label.setVisibility(View.VISIBLE);
	if (position == Time.SATURDAY) {
	label.setTextColor(mSaturdayColor);
	} else if (position == Time.SUNDAY) {
	label.setTextColor(mSundayColor);
	} else {
	label.setTextColor(mDayNameColor);
	}
	} else {
	label.setVisibility(View.GONE);
	}
	}
	mDayNamesHeader.invalidate();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
	View v = inflater.inflate(R.layout.month_by_week,
	container, false);
	mDayNamesHeader = (ViewGroup) v.findViewById(R.id.day_names);
	return v;
	}

	/**
	* Returns the UTC millis since epoch representation of the currently
	* selected time.
	*
	* @return
	*/
	public long getSelectedTime() {
	return mSelectedDay.toMillis(true);
	}

	/**
	* This moves to the specified time in the view. If the time is not already
	* in range it will move the list so that the first of the month containing
	* the time is at the top of the view. If the new time is already in view
	* the list will not be scrolled unless forceScroll is true. This time may
	* optionally be highlighted as selected as well.
	*
	* @param time The time to move to
	* @param animate Whether to scroll to the given time or just redraw at the
	* new location
	* @param setSelected Whether to set the given time as selected
	* @param forceScroll Whether to recenter even if the time is already
	* visible
	* @return Whether or not the view animated to the new location
	*/
	public boolean goTo(long time, boolean animate, boolean setSelected, boolean forceScroll) {
	if (time == -1) {
	Log.e(TAG, "time is invalid");
	return false;
	}

	// Set the selected day
	if (setSelected) {
	mSelectedDay.set(time);
	mSelectedDay.normalize(true);
	}

	// If this view isn't returned yet we won't be able to load the lists
	// current position, so return after setting the selected day.
	if (!isResumed()) {
	if (Log.isLoggable(TAG, Log.DEBUG)) {
	Log.d(TAG, "We're not visible yet");
	}
	return false;
	}

	mTempTime.set(time);
	long millis = mTempTime.normalize(true);
	// Get the week we're going to
	// TODO push Util function into Calendar public api.
	int position = Utils.getWeeksSinceEpochFromJulianDay(
	Time.getJulianDay(millis, mTempTime.gmtoff), mFirstDayOfWeek);

	View child;
	int i = 0;
	int top = 0;
	// Find a child that's completely in the view
	do {
	child = mListView.getChildAt(i++);
	if (child == null) {
	break;
	}
	top = child.getTop();
	if (Log.isLoggable(TAG, Log.DEBUG)) {
	Log.d(TAG, "child at " + (i-1) + " has top " + top);
	}
	} while (top < 0);

	// Compute the first and last position visible
	int firstPosition;
	if (child != null) {
	firstPosition = mListView.getPositionForView(child);
	} else {
	firstPosition = 0;
	}
	int lastPosition = firstPosition + mNumWeeks - 1;
	if (top > BOTTOM_BUFFER) {
	lastPosition--;
	}

	if (setSelected) {
	mAdapter.setSelectedDay(mSelectedDay);
	}

	if (Log.isLoggable(TAG, Log.DEBUG)) {
	Log.d(TAG, "GoTo position " + position);
	}
	// Check if the selected day is now outside of our visible range
	// and if so scroll to the month that contains it
	if (position < firstPosition \|\| position > lastPosition \|\| forceScroll) {
	mFirstDayOfMonth.set(mTempTime);
	mFirstDayOfMonth.monthDay = 1;
	millis = mFirstDayOfMonth.normalize(true);
	setMonthDisplayed(mFirstDayOfMonth, true);
	position = Utils.getWeeksSinceEpochFromJulianDay(
	Time.getJulianDay(millis, mFirstDayOfMonth.gmtoff), mFirstDayOfWeek);

	mPreviousScrollState = OnScrollListener.SCROLL_STATE_FLING;
	if (animate) {
	mListView.smoothScrollToPositionFromTop(
	position, LIST_TOP_OFFSET, GOTO_SCROLL_DURATION);
	return true;
	} else {
	mListView.setSelectionFromTop(position, LIST_TOP_OFFSET);
	// Perform any after scroll operations that are needed
	onScrollStateChanged(mListView, OnScrollListener.SCROLL_STATE_IDLE);
	}
	} else if (setSelected) {
	// Otherwise just set the selection
	setMonthDisplayed(mSelectedDay, true);
	}
	return false;
	}

	/**
	* Updates the title and selected month if the view has moved to a new
	* month.
	*/
	@Override
	public void onScroll(
	AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
	SimpleWeekView child = (SimpleWeekView)view.getChildAt(0);
	if (child == null) {
	return;
	}

	// Figure out where we are
	long currScroll = view.getFirstVisiblePosition() * child.getHeight() - child.getBottom();
	mFirstVisibleDay.setJulianDay(child.getFirstJulianDay());

	// If we have moved since our last call update the direction
	if (currScroll < mPreviousScrollPosition) {
	mIsScrollingUp = true;
	} else if (currScroll > mPreviousScrollPosition) {
	mIsScrollingUp = false;
	} else {
	return;
	}

	mPreviousScrollPosition = currScroll;
	mPreviousScrollState = mCurrentScrollState;

	updateMonthHighlight(mListView);
	}

	/**
	* Figures out if the month being shown has changed and updates the
	* highlight if needed
	*
	* @param view The ListView containing the weeks
	*/
	private void updateMonthHighlight(AbsListView view) {
	SimpleWeekView child = (SimpleWeekView) view.getChildAt(0);
	if (child == null) {
	return;
	}

	// Figure out where we are
	int offset = child.getBottom() < WEEK_MIN_VISIBLE_HEIGHT ? 1 : 0;
	// Use some hysteresis for checking which month to highlight. This
	// causes the month to transition when two full weeks of a month are
	// visible.
	child = (SimpleWeekView) view.getChildAt(SCROLL_HYST_WEEKS + offset);

	if (child == null) {
	return;
	}

	// Find out which month we're moving into
	int month;
	if (mIsScrollingUp) {
	month = child.getFirstMonth();
	} else {
	month = child.getLastMonth();
	}

	// And how it relates to our current highlighted month
	int monthDiff;
	if (mCurrentMonthDisplayed == 11 && month == 0) {
	monthDiff = 1;
	} else if (mCurrentMonthDisplayed == 0 && month == 11) {
	monthDiff = -1;
	} else {
	monthDiff = month - mCurrentMonthDisplayed;
	}

	// Only switch months if we're scrolling away from the currently
	// selected month
	if (monthDiff != 0) {
	int julianDay = child.getFirstJulianDay();
	if (mIsScrollingUp) {
	// Takes the start of the week
	} else {
	// Takes the start of the following week
	julianDay += DAYS_PER_WEEK;
	}
	mTempTime.setJulianDay(julianDay);
	setMonthDisplayed(mTempTime, false);
	}
	}

	/**
	* Sets the month displayed at the top of this view based on time. Override
	* to add custom events when the title is changed.
	*
	* @param time A day in the new focus month.
	* @param updateHighlight TODO(epastern):
	*/
	protected void setMonthDisplayed(Time time, boolean updateHighlight) {
	CharSequence oldMonth = mMonthName.getText();
	mMonthName.setText(Utils.formatMonthYear(mContext, time));
	mMonthName.invalidate();
	if (!TextUtils.equals(oldMonth, mMonthName.getText())) {
	mMonthName.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
	}
	mCurrentMonthDisplayed = time.month;
	if (updateHighlight) {
	mAdapter.updateFocusMonth(mCurrentMonthDisplayed);
	}
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
	// use a post to prevent re-entering onScrollStateChanged before it
	// exits
	mScrollStateChangedRunnable.doScrollStateChange(view, scrollState);
	}

	protected ScrollStateRunnable mScrollStateChangedRunnable = new ScrollStateRunnable();

	protected class ScrollStateRunnable implements Runnable {
	private int mNewState;

	/**
	* Sets up the runnable with a short delay in case the scroll state
	* immediately changes again.
	*
	* @param view The list view that changed state
	* @param scrollState The new state it changed to
	*/
	public void doScrollStateChange(AbsListView view, int scrollState) {
	mHandler.removeCallbacks(this);
	mNewState = scrollState;
	mHandler.postDelayed(this, SCROLL_CHANGE_DELAY);
	}

	public void run() {
	mCurrentScrollState = mNewState;
	if (Log.isLoggable(TAG, Log.DEBUG)) {
	Log.d(TAG,
	"new scroll state: " + mNewState + " old state: " + mPreviousScrollState);
	}
	// Fix the position after a scroll or a fling ends
	if (mNewState == OnScrollListener.SCROLL_STATE_IDLE
	&& mPreviousScrollState != OnScrollListener.SCROLL_STATE_IDLE) {
	mPreviousScrollState = mNewState;
	mAdapter.updateFocusMonth(mCurrentMonthDisplayed);
	} else {
	mPreviousScrollState = mNewState;
	}
	}
	}
	}