core/java/android/widget/DateTimeView.java - platform/frameworks/base - 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 android.widget;

 import static android.text.format.DateUtils.DAY_IN_MILLIS;
 import static android.text.format.DateUtils.HOUR_IN_MILLIS;
 import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
 import static android.text.format.DateUtils.YEAR_IN_MILLIS;
 import static android.text.format.Time.getJulianDay;

 import android.app.ActivityThread;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.res.Configuration;
 import android.content.res.TypedArray;
 import android.database.ContentObserver;
 import android.icu.util.Calendar;
 import android.os.Handler;
 import android.text.format.Time;
 import android.util.AttributeSet;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.RemoteViews.RemoteView;

 import com.android.internal.R;

 import java.text.DateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.TimeZone;

 //
 // TODO
 // - listen for the next threshold time to update the view.
 // - listen for date format pref changed
 // - put the AM/PM in a smaller font
 //

 /**
  * Displays a given time in a convenient human-readable foramt.
  *
  * @hide
  */
 @RemoteView
 public class DateTimeView extends TextView {
     private static final int SHOW_TIME = 0;
     private static final int SHOW_MONTH_DAY_YEAR = 1;

     Date mTime;
     long mTimeMillis;

     int mLastDisplay = -1;
     DateFormat mLastFormat;

     private long mUpdateTimeMillis;
     private static final ThreadLocal<ReceiverInfo> sReceiverInfo = new ThreadLocal<ReceiverInfo>();
     private String mNowText;
     private boolean mShowRelativeTime;

     public DateTimeView(Context context) {
         this(context, null);
     }

     public DateTimeView(Context context, AttributeSet attrs) {
         super(context, attrs);
         final TypedArray a = context.obtainStyledAttributes(attrs,
                 com.android.internal.R.styleable.DateTimeView, 0,
                 0);

         final int N = a.getIndexCount();
         for (int i = 0; i < N; i++) {
             int attr = a.getIndex(i);
             switch (attr) {
                 case R.styleable.DateTimeView_showRelative:
                     boolean relative = a.getBoolean(i, false);
                     setShowRelativeTime(relative);
                     break;
             }
         }
         a.recycle();
     }

     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();
         ReceiverInfo ri = sReceiverInfo.get();
         if (ri == null) {
             ri = new ReceiverInfo();
             sReceiverInfo.set(ri);
         }
         ri.addView(this);
     }

     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         final ReceiverInfo ri = sReceiverInfo.get();
         if (ri != null) {
             ri.removeView(this);
         }
     }

     @android.view.RemotableViewMethod
     public void setTime(long time) {
         Time t = new Time();
         t.set(time);
         mTimeMillis = t.toMillis(false);
         mTime = new Date(t.year-1900, t.month, t.monthDay, t.hour, t.minute, 0);
         update();
     }

     @android.view.RemotableViewMethod
     public void setShowRelativeTime(boolean showRelativeTime) {
         mShowRelativeTime = showRelativeTime;
         updateNowText();
         update();
     }

     @Override
     @android.view.RemotableViewMethod
     public void setVisibility(@Visibility int visibility) {
         boolean gotVisible = visibility != GONE && getVisibility() == GONE;
         super.setVisibility(visibility);
         if (gotVisible) {
             update();
         }
     }

     void update() {
         if (mTime == null || getVisibility() == GONE) {
             return;
         }
         if (mShowRelativeTime) {
             updateRelativeTime();
             return;
         }

         int display;
         Date time = mTime;

         Time t = new Time();
         t.set(mTimeMillis);
         t.second = 0;

         t.hour -= 12;
         long twelveHoursBefore = t.toMillis(false);
         t.hour += 12;
         long twelveHoursAfter = t.toMillis(false);
         t.hour = 0;
         t.minute = 0;
         long midnightBefore = t.toMillis(false);
         t.monthDay++;
         long midnightAfter = t.toMillis(false);

         long nowMillis = System.currentTimeMillis();
         t.set(nowMillis);
         t.second = 0;
         nowMillis = t.normalize(false);

         // Choose the display mode
         choose_display: {
             if ((nowMillis >= midnightBefore && nowMillis < midnightAfter)
                     || (nowMillis >= twelveHoursBefore && nowMillis < twelveHoursAfter)) {
                 display = SHOW_TIME;
                 break choose_display;
             }
             // Else, show month day and year.
             display = SHOW_MONTH_DAY_YEAR;
             break choose_display;
         }

         // Choose the format
         DateFormat format;
         if (display == mLastDisplay && mLastFormat != null) {
             // use cached format
             format = mLastFormat;
         } else {
             switch (display) {
                 case SHOW_TIME:
                     format = getTimeFormat();
                     break;
                 case SHOW_MONTH_DAY_YEAR:
                     format = DateFormat.getDateInstance(DateFormat.SHORT);
                     break;
                 default:
                     throw new RuntimeException("unknown display value: " + display);
             }
             mLastFormat = format;
         }

         // Set the text
         String text = format.format(mTime);
         setText(text);

         // Schedule the next update
         if (display == SHOW_TIME) {
             // Currently showing the time, update at the later of twelve hours after or midnight.
             mUpdateTimeMillis = twelveHoursAfter > midnightAfter ? twelveHoursAfter : midnightAfter;
         } else {
             // Currently showing the date
             if (mTimeMillis < nowMillis) {
                 // If the time is in the past, don't schedule an update
                 mUpdateTimeMillis = 0;
             } else {
                 // If hte time is in the future, schedule one at the earlier of twelve hours
                 // before or midnight before.
                 mUpdateTimeMillis = twelveHoursBefore < midnightBefore
                         ? twelveHoursBefore : midnightBefore;
             }
         }
     }

     private void updateRelativeTime() {
         long now = System.currentTimeMillis();
         long duration = Math.abs(now - mTimeMillis);
         int count;
         long millisIncrease;
         boolean past = (now >= mTimeMillis);
         String result;
         if (duration < MINUTE_IN_MILLIS) {
             setText(mNowText);
             mUpdateTimeMillis = mTimeMillis + MINUTE_IN_MILLIS + 1;
             return;
         } else if (duration < HOUR_IN_MILLIS) {
             count = (int)(duration / MINUTE_IN_MILLIS);
             result = String.format(getContext().getResources().getQuantityString(past
                             ? com.android.internal.R.plurals.duration_minutes_shortest
                             : com.android.internal.R.plurals.duration_minutes_shortest_future,
                             count),
                     count);
             millisIncrease = MINUTE_IN_MILLIS;
         } else if (duration < DAY_IN_MILLIS) {
             count = (int)(duration / HOUR_IN_MILLIS);
             result = String.format(getContext().getResources().getQuantityString(past
                             ? com.android.internal.R.plurals.duration_hours_shortest
                             : com.android.internal.R.plurals.duration_hours_shortest_future,
                             count),
                     count);
             millisIncrease = HOUR_IN_MILLIS;
         } else if (duration < YEAR_IN_MILLIS) {
             // In weird cases it can become 0 because of daylight savings
             TimeZone timeZone = TimeZone.getDefault();
             count = Math.max(Math.abs(dayDistance(timeZone, mTimeMillis, now)), 1);
             result = String.format(getContext().getResources().getQuantityString(past
                             ? com.android.internal.R.plurals.duration_days_shortest
                             : com.android.internal.R.plurals.duration_days_shortest_future,
                             count),
                     count);
             if (past || count != 1) {
                 mUpdateTimeMillis = computeNextMidnight(timeZone);
                 millisIncrease = -1;
             } else {
                 millisIncrease = DAY_IN_MILLIS;
             }

         } else {
             count = (int)(duration / YEAR_IN_MILLIS);
             result = String.format(getContext().getResources().getQuantityString(past
                             ? com.android.internal.R.plurals.duration_years_shortest
                             : com.android.internal.R.plurals.duration_years_shortest_future,
                             count),
                     count);
             millisIncrease = YEAR_IN_MILLIS;
         }
         if (millisIncrease != -1) {
             if (past) {
                 mUpdateTimeMillis = mTimeMillis + millisIncrease * (count + 1) + 1;
             } else {
                 mUpdateTimeMillis = mTimeMillis - millisIncrease * count + 1;
             }
         }
         setText(result);
     }

     /**
      * @param timeZone the timezone we are in
      * @return the timepoint in millis at UTC at midnight in the current timezone
      */
     private long computeNextMidnight(TimeZone timeZone) {
         Calendar c = Calendar.getInstance();
         c.setTimeZone(libcore.icu.DateUtilsBridge.icuTimeZone(timeZone));
         c.add(Calendar.DAY_OF_MONTH, 1);
         c.set(Calendar.HOUR_OF_DAY, 0);
         c.set(Calendar.MINUTE, 0);
         c.set(Calendar.SECOND, 0);
         c.set(Calendar.MILLISECOND, 0);
         return c.getTimeInMillis();
     }

     @Override
     protected void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
         updateNowText();
         update();
     }

     private void updateNowText() {
         if (!mShowRelativeTime) {
             return;
         }
         mNowText = getContext().getResources().getString(
                 com.android.internal.R.string.now_string_shortest);
     }

     // Return the date difference for the two times in a given timezone.
     private static int dayDistance(TimeZone timeZone, long startTime,
             long endTime) {
         return getJulianDay(endTime, timeZone.getOffset(endTime) / 1000)
                 - getJulianDay(startTime, timeZone.getOffset(startTime) / 1000);
     }

     private DateFormat getTimeFormat() {
         return android.text.format.DateFormat.getTimeFormat(getContext());
     }

     void clearFormatAndUpdate() {
         mLastFormat = null;
         update();
     }

     @Override
     public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfoInternal(info);
         if (mShowRelativeTime) {
             // The short version of the time might not be completely understandable and for
             // accessibility we rather have a longer version.
             long now = System.currentTimeMillis();
             long duration = Math.abs(now - mTimeMillis);
             int count;
             boolean past = (now >= mTimeMillis);
             String result;
             if (duration < MINUTE_IN_MILLIS) {
                 result = mNowText;
             } else if (duration < HOUR_IN_MILLIS) {
                 count = (int)(duration / MINUTE_IN_MILLIS);
                 result = String.format(getContext().getResources().getQuantityString(past
                                 ? com.android.internal.
                                         R.plurals.duration_minutes_relative
                                 : com.android.internal.
                                         R.plurals.duration_minutes_relative_future,
                         count),
                         count);
             } else if (duration < DAY_IN_MILLIS) {
                 count = (int)(duration / HOUR_IN_MILLIS);
                 result = String.format(getContext().getResources().getQuantityString(past
                                 ? com.android.internal.
                                         R.plurals.duration_hours_relative
                                 : com.android.internal.
                                         R.plurals.duration_hours_relative_future,
                         count),
                         count);
             } else if (duration < YEAR_IN_MILLIS) {
                 // In weird cases it can become 0 because of daylight savings
                 TimeZone timeZone = TimeZone.getDefault();
                 count = Math.max(Math.abs(dayDistance(timeZone, mTimeMillis, now)), 1);
                 result = String.format(getContext().getResources().getQuantityString(past
                                 ? com.android.internal.
                                         R.plurals.duration_days_relative
                                 : com.android.internal.
                                         R.plurals.duration_days_relative_future,
                         count),
                         count);

             } else {
                 count = (int)(duration / YEAR_IN_MILLIS);
                 result = String.format(getContext().getResources().getQuantityString(past
                                 ? com.android.internal.
                                         R.plurals.duration_years_relative
                                 : com.android.internal.
                                         R.plurals.duration_years_relative_future,
                         count),
                         count);
             }
             info.setText(result);
         }
     }

     /**
      * @hide
      */
     public static void setReceiverHandler(Handler handler) {
         ReceiverInfo ri = sReceiverInfo.get();
         if (ri == null) {
             ri = new ReceiverInfo();
             sReceiverInfo.set(ri);
         }
         ri.setHandler(handler);
     }

     private static class ReceiverInfo {
         private final ArrayList<DateTimeView> mAttachedViews = new ArrayList<DateTimeView>();
         private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
                 String action = intent.getAction();
                 if (Intent.ACTION_TIME_TICK.equals(action)) {
                     if (System.currentTimeMillis() < getSoonestUpdateTime()) {
                         // The update() function takes a few milliseconds to run because of
                         // all of the time conversions it needs to do, so we can't do that
                         // every minute.
                         return;
                     }
                 }
                 // ACTION_TIME_CHANGED can also signal a change of 12/24 hr. format.
                 updateAll();
             }
         };

         private final ContentObserver mObserver = new ContentObserver(new Handler()) {
             @Override
             public void onChange(boolean selfChange) {
                 updateAll();
             }
         };

         private Handler mHandler = new Handler();

         public void addView(DateTimeView v) {
             synchronized (mAttachedViews) {
                 final boolean register = mAttachedViews.isEmpty();
                 mAttachedViews.add(v);
                 if (register) {
                     register(getApplicationContextIfAvailable(v.getContext()));
                 }
             }
         }

         public void removeView(DateTimeView v) {
             synchronized (mAttachedViews) {
                 mAttachedViews.remove(v);
                 if (mAttachedViews.isEmpty()) {
                     unregister(getApplicationContextIfAvailable(v.getContext()));
                 }
             }
         }

         void updateAll() {
             synchronized (mAttachedViews) {
                 final int count = mAttachedViews.size();
                 for (int i = 0; i < count; i++) {
                     DateTimeView view = mAttachedViews.get(i);
                     view.post(() -> view.clearFormatAndUpdate());
                 }
             }
         }

         long getSoonestUpdateTime() {
             long result = Long.MAX_VALUE;
             synchronized (mAttachedViews) {
                 final int count = mAttachedViews.size();
                 for (int i = 0; i < count; i++) {
                     final long time = mAttachedViews.get(i).mUpdateTimeMillis;
                     if (time < result) {
                         result = time;
                     }
                 }
             }
             return result;
         }

         static final Context getApplicationContextIfAvailable(Context context) {
             final Context ac = context.getApplicationContext();
             return ac != null ? ac : ActivityThread.currentApplication().getApplicationContext();
         }

         void register(Context context) {
             final IntentFilter filter = new IntentFilter();
             filter.addAction(Intent.ACTION_TIME_TICK);
             filter.addAction(Intent.ACTION_TIME_CHANGED);
             filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
             filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
             context.registerReceiver(mReceiver, filter, null, mHandler);
         }

         void unregister(Context context) {
             context.unregisterReceiver(mReceiver);
         }

         public void setHandler(Handler handler) {
             mHandler = handler;
             synchronized (mAttachedViews) {
                 if (!mAttachedViews.isEmpty()) {
                     unregister(mAttachedViews.get(0).getContext());
                     register(mAttachedViews.get(0).getContext());
                 }
             }
         }
     }
 }
	/*
	* 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 android.widget;

	import static android.text.format.DateUtils.DAY_IN_MILLIS;
	import static android.text.format.DateUtils.HOUR_IN_MILLIS;
	import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
	import static android.text.format.DateUtils.YEAR_IN_MILLIS;
	import static android.text.format.Time.getJulianDay;

	import android.app.ActivityThread;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.content.res.Configuration;
	import android.content.res.TypedArray;
	import android.database.ContentObserver;
	import android.icu.util.Calendar;
	import android.os.Handler;
	import android.text.format.Time;
	import android.util.AttributeSet;
	import android.view.accessibility.AccessibilityNodeInfo;
	import android.widget.RemoteViews.RemoteView;

	import com.android.internal.R;

	import java.text.DateFormat;
	import java.util.ArrayList;
	import java.util.Date;
	import java.util.TimeZone;

	//
	// TODO
	// - listen for the next threshold time to update the view.
	// - listen for date format pref changed
	// - put the AM/PM in a smaller font
	//

	/**
	* Displays a given time in a convenient human-readable foramt.
	*
	* @hide
	*/
	@RemoteView
	public class DateTimeView extends TextView {
	private static final int SHOW_TIME = 0;
	private static final int SHOW_MONTH_DAY_YEAR = 1;

	Date mTime;
	long mTimeMillis;

	int mLastDisplay = -1;
	DateFormat mLastFormat;

	private long mUpdateTimeMillis;
	private static final ThreadLocal<ReceiverInfo> sReceiverInfo = new ThreadLocal<ReceiverInfo>();
	private String mNowText;
	private boolean mShowRelativeTime;

	public DateTimeView(Context context) {
	this(context, null);
	}

	public DateTimeView(Context context, AttributeSet attrs) {
	super(context, attrs);
	final TypedArray a = context.obtainStyledAttributes(attrs,
	com.android.internal.R.styleable.DateTimeView, 0,
	0);

	final int N = a.getIndexCount();
	for (int i = 0; i < N; i++) {
	int attr = a.getIndex(i);
	switch (attr) {
	case R.styleable.DateTimeView_showRelative:
	boolean relative = a.getBoolean(i, false);
	setShowRelativeTime(relative);
	break;
	}
	}
	a.recycle();
	}

	@Override
	protected void onAttachedToWindow() {
	super.onAttachedToWindow();
	ReceiverInfo ri = sReceiverInfo.get();
	if (ri == null) {
	ri = new ReceiverInfo();
	sReceiverInfo.set(ri);
	}
	ri.addView(this);
	}

	@Override
	protected void onDetachedFromWindow() {
	super.onDetachedFromWindow();
	final ReceiverInfo ri = sReceiverInfo.get();
	if (ri != null) {
	ri.removeView(this);
	}
	}

	@android.view.RemotableViewMethod
	public void setTime(long time) {
	Time t = new Time();
	t.set(time);
	mTimeMillis = t.toMillis(false);
	mTime = new Date(t.year-1900, t.month, t.monthDay, t.hour, t.minute, 0);
	update();
	}

	@android.view.RemotableViewMethod
	public void setShowRelativeTime(boolean showRelativeTime) {
	mShowRelativeTime = showRelativeTime;
	updateNowText();
	update();
	}

	@Override
	@android.view.RemotableViewMethod
	public void setVisibility(@Visibility int visibility) {
	boolean gotVisible = visibility != GONE && getVisibility() == GONE;
	super.setVisibility(visibility);
	if (gotVisible) {
	update();
	}
	}

	void update() {
	if (mTime == null \|\| getVisibility() == GONE) {
	return;
	}
	if (mShowRelativeTime) {
	updateRelativeTime();
	return;
	}

	int display;
	Date time = mTime;

	Time t = new Time();
	t.set(mTimeMillis);
	t.second = 0;

	t.hour -= 12;
	long twelveHoursBefore = t.toMillis(false);
	t.hour += 12;
	long twelveHoursAfter = t.toMillis(false);
	t.hour = 0;
	t.minute = 0;
	long midnightBefore = t.toMillis(false);
	t.monthDay++;
	long midnightAfter = t.toMillis(false);

	long nowMillis = System.currentTimeMillis();
	t.set(nowMillis);
	t.second = 0;
	nowMillis = t.normalize(false);

	// Choose the display mode
	choose_display: {
	if ((nowMillis >= midnightBefore && nowMillis < midnightAfter)
	\|\| (nowMillis >= twelveHoursBefore && nowMillis < twelveHoursAfter)) {
	display = SHOW_TIME;
	break choose_display;
	}
	// Else, show month day and year.
	display = SHOW_MONTH_DAY_YEAR;
	break choose_display;
	}

	// Choose the format
	DateFormat format;
	if (display == mLastDisplay && mLastFormat != null) {
	// use cached format
	format = mLastFormat;
	} else {
	switch (display) {
	case SHOW_TIME:
	format = getTimeFormat();
	break;
	case SHOW_MONTH_DAY_YEAR:
	format = DateFormat.getDateInstance(DateFormat.SHORT);
	break;
	default:
	throw new RuntimeException("unknown display value: " + display);
	}
	mLastFormat = format;
	}

	// Set the text
	String text = format.format(mTime);
	setText(text);

	// Schedule the next update
	if (display == SHOW_TIME) {
	// Currently showing the time, update at the later of twelve hours after or midnight.
	mUpdateTimeMillis = twelveHoursAfter > midnightAfter ? twelveHoursAfter : midnightAfter;
	} else {
	// Currently showing the date
	if (mTimeMillis < nowMillis) {
	// If the time is in the past, don't schedule an update
	mUpdateTimeMillis = 0;
	} else {
	// If hte time is in the future, schedule one at the earlier of twelve hours
	// before or midnight before.
	mUpdateTimeMillis = twelveHoursBefore < midnightBefore
	? twelveHoursBefore : midnightBefore;
	}
	}
	}

	private void updateRelativeTime() {
	long now = System.currentTimeMillis();
	long duration = Math.abs(now - mTimeMillis);
	int count;
	long millisIncrease;
	boolean past = (now >= mTimeMillis);
	String result;
	if (duration < MINUTE_IN_MILLIS) {
	setText(mNowText);
	mUpdateTimeMillis = mTimeMillis + MINUTE_IN_MILLIS + 1;
	return;
	} else if (duration < HOUR_IN_MILLIS) {
	count = (int)(duration / MINUTE_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.R.plurals.duration_minutes_shortest
	: com.android.internal.R.plurals.duration_minutes_shortest_future,
	count),
	count);
	millisIncrease = MINUTE_IN_MILLIS;
	} else if (duration < DAY_IN_MILLIS) {
	count = (int)(duration / HOUR_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.R.plurals.duration_hours_shortest
	: com.android.internal.R.plurals.duration_hours_shortest_future,
	count),
	count);
	millisIncrease = HOUR_IN_MILLIS;
	} else if (duration < YEAR_IN_MILLIS) {
	// In weird cases it can become 0 because of daylight savings
	TimeZone timeZone = TimeZone.getDefault();
	count = Math.max(Math.abs(dayDistance(timeZone, mTimeMillis, now)), 1);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.R.plurals.duration_days_shortest
	: com.android.internal.R.plurals.duration_days_shortest_future,
	count),
	count);
	if (past \|\| count != 1) {
	mUpdateTimeMillis = computeNextMidnight(timeZone);
	millisIncrease = -1;
	} else {
	millisIncrease = DAY_IN_MILLIS;
	}

	} else {
	count = (int)(duration / YEAR_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.R.plurals.duration_years_shortest
	: com.android.internal.R.plurals.duration_years_shortest_future,
	count),
	count);
	millisIncrease = YEAR_IN_MILLIS;
	}
	if (millisIncrease != -1) {
	if (past) {
	mUpdateTimeMillis = mTimeMillis + millisIncrease * (count + 1) + 1;
	} else {
	mUpdateTimeMillis = mTimeMillis - millisIncrease * count + 1;
	}
	}
	setText(result);
	}

	/**
	* @param timeZone the timezone we are in
	* @return the timepoint in millis at UTC at midnight in the current timezone
	*/
	private long computeNextMidnight(TimeZone timeZone) {
	Calendar c = Calendar.getInstance();
	c.setTimeZone(libcore.icu.DateUtilsBridge.icuTimeZone(timeZone));
	c.add(Calendar.DAY_OF_MONTH, 1);
	c.set(Calendar.HOUR_OF_DAY, 0);
	c.set(Calendar.MINUTE, 0);
	c.set(Calendar.SECOND, 0);
	c.set(Calendar.MILLISECOND, 0);
	return c.getTimeInMillis();
	}

	@Override
	protected void onConfigurationChanged(Configuration newConfig) {
	super.onConfigurationChanged(newConfig);
	updateNowText();
	update();
	}

	private void updateNowText() {
	if (!mShowRelativeTime) {
	return;
	}
	mNowText = getContext().getResources().getString(
	com.android.internal.R.string.now_string_shortest);
	}

	// Return the date difference for the two times in a given timezone.
	private static int dayDistance(TimeZone timeZone, long startTime,
	long endTime) {
	return getJulianDay(endTime, timeZone.getOffset(endTime) / 1000)
	- getJulianDay(startTime, timeZone.getOffset(startTime) / 1000);
	}

	private DateFormat getTimeFormat() {
	return android.text.format.DateFormat.getTimeFormat(getContext());
	}

	void clearFormatAndUpdate() {
	mLastFormat = null;
	update();
	}

	@Override
	public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
	super.onInitializeAccessibilityNodeInfoInternal(info);
	if (mShowRelativeTime) {
	// The short version of the time might not be completely understandable and for
	// accessibility we rather have a longer version.
	long now = System.currentTimeMillis();
	long duration = Math.abs(now - mTimeMillis);
	int count;
	boolean past = (now >= mTimeMillis);
	String result;
	if (duration < MINUTE_IN_MILLIS) {
	result = mNowText;
	} else if (duration < HOUR_IN_MILLIS) {
	count = (int)(duration / MINUTE_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.
	R.plurals.duration_minutes_relative
	: com.android.internal.
	R.plurals.duration_minutes_relative_future,
	count),
	count);
	} else if (duration < DAY_IN_MILLIS) {
	count = (int)(duration / HOUR_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.
	R.plurals.duration_hours_relative
	: com.android.internal.
	R.plurals.duration_hours_relative_future,
	count),
	count);
	} else if (duration < YEAR_IN_MILLIS) {
	// In weird cases it can become 0 because of daylight savings
	TimeZone timeZone = TimeZone.getDefault();
	count = Math.max(Math.abs(dayDistance(timeZone, mTimeMillis, now)), 1);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.
	R.plurals.duration_days_relative
	: com.android.internal.
	R.plurals.duration_days_relative_future,
	count),
	count);

	} else {
	count = (int)(duration / YEAR_IN_MILLIS);
	result = String.format(getContext().getResources().getQuantityString(past
	? com.android.internal.
	R.plurals.duration_years_relative
	: com.android.internal.
	R.plurals.duration_years_relative_future,
	count),
	count);
	}
	info.setText(result);
	}
	}

	/**
	* @hide
	*/
	public static void setReceiverHandler(Handler handler) {
	ReceiverInfo ri = sReceiverInfo.get();
	if (ri == null) {
	ri = new ReceiverInfo();
	sReceiverInfo.set(ri);
	}
	ri.setHandler(handler);
	}

	private static class ReceiverInfo {
	private final ArrayList<DateTimeView> mAttachedViews = new ArrayList<DateTimeView>();
	private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	String action = intent.getAction();
	if (Intent.ACTION_TIME_TICK.equals(action)) {
	if (System.currentTimeMillis() < getSoonestUpdateTime()) {
	// The update() function takes a few milliseconds to run because of
	// all of the time conversions it needs to do, so we can't do that
	// every minute.
	return;
	}
	}
	// ACTION_TIME_CHANGED can also signal a change of 12/24 hr. format.
	updateAll();
	}
	};

	private final ContentObserver mObserver = new ContentObserver(new Handler()) {
	@Override
	public void onChange(boolean selfChange) {
	updateAll();
	}
	};

	private Handler mHandler = new Handler();

	public void addView(DateTimeView v) {
	synchronized (mAttachedViews) {
	final boolean register = mAttachedViews.isEmpty();
	mAttachedViews.add(v);
	if (register) {
	register(getApplicationContextIfAvailable(v.getContext()));
	}
	}
	}

	public void removeView(DateTimeView v) {
	synchronized (mAttachedViews) {
	mAttachedViews.remove(v);
	if (mAttachedViews.isEmpty()) {
	unregister(getApplicationContextIfAvailable(v.getContext()));
	}
	}
	}

	void updateAll() {
	synchronized (mAttachedViews) {
	final int count = mAttachedViews.size();
	for (int i = 0; i < count; i++) {
	DateTimeView view = mAttachedViews.get(i);
	view.post(() -> view.clearFormatAndUpdate());
	}
	}
	}

	long getSoonestUpdateTime() {
	long result = Long.MAX_VALUE;
	synchronized (mAttachedViews) {
	final int count = mAttachedViews.size();
	for (int i = 0; i < count; i++) {
	final long time = mAttachedViews.get(i).mUpdateTimeMillis;
	if (time < result) {
	result = time;
	}
	}
	}
	return result;
	}

	static final Context getApplicationContextIfAvailable(Context context) {
	final Context ac = context.getApplicationContext();
	return ac != null ? ac : ActivityThread.currentApplication().getApplicationContext();
	}

	void register(Context context) {
	final IntentFilter filter = new IntentFilter();
	filter.addAction(Intent.ACTION_TIME_TICK);
	filter.addAction(Intent.ACTION_TIME_CHANGED);
	filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
	filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
	context.registerReceiver(mReceiver, filter, null, mHandler);
	}

	void unregister(Context context) {
	context.unregisterReceiver(mReceiver);
	}

	public void setHandler(Handler handler) {
	mHandler = handler;
	synchronized (mAttachedViews) {
	if (!mAttachedViews.isEmpty()) {
	unregister(mAttachedViews.get(0).getContext());
	register(mAttachedViews.get(0).getContext());
	}
	}
	}
	}
	}