src/com/android/settings/DateTimeSettings.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2008 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.settings;

 import android.app.Activity;
 import android.app.AlarmManager;
 import android.app.DatePickerDialog;
 import android.app.Dialog;
 import android.app.TimePickerDialog;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.preference.CheckBoxPreference;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceScreen;
 import android.provider.Settings;
 import android.provider.Settings.SettingNotFoundException;
 import android.text.format.DateFormat;
 import android.widget.DatePicker;
 import android.widget.TimePicker;

 import java.util.Calendar;
 import java.util.Date;
 import java.util.TimeZone;

 public class DateTimeSettings extends SettingsPreferenceFragment
         implements OnSharedPreferenceChangeListener,
                 TimePickerDialog.OnTimeSetListener, DatePickerDialog.OnDateSetListener {

     private static final String HOURS_12 = "12";
     private static final String HOURS_24 = "24";

     // Used for showing the current date format, which looks like "12/31/2010", "2010/12/13", etc.
     // The date value is dummy (independent of actual date).
     private Calendar mDummyDate;

     private static final String KEY_DATE_FORMAT = "date_format";
     private static final String KEY_AUTO_TIME = "auto_time";
     private static final String KEY_AUTO_TIME_ZONE = "auto_zone";

     private static final int DIALOG_DATEPICKER = 0;
     private static final int DIALOG_TIMEPICKER = 1;

     // have we been launched from the setup wizard?
     protected static final String EXTRA_IS_FIRST_RUN = "firstRun";

     private CheckBoxPreference mAutoTimePref;
     private Preference mTimePref;
     private Preference mTime24Pref;
     private CheckBoxPreference mAutoTimeZonePref;
     private Preference mTimeZone;
     private Preference mDatePref;
     private ListPreference mDateFormat;

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

         addPreferencesFromResource(R.xml.date_time_prefs);

         initUI();
     }

     private void initUI() {
         boolean autoTimeEnabled = getAutoState(Settings.Global.AUTO_TIME);
         boolean autoTimeZoneEnabled = getAutoState(Settings.Global.AUTO_TIME_ZONE);

         Intent intent = getActivity().getIntent();
         boolean isFirstRun = intent.getBooleanExtra(EXTRA_IS_FIRST_RUN, false);

         mDummyDate = Calendar.getInstance();

         mAutoTimePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME);
         mAutoTimePref.setChecked(autoTimeEnabled);
         mAutoTimeZonePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME_ZONE);
         // Override auto-timezone if it's a wifi-only device or if we're still in setup wizard.
         // TODO: Remove the wifiOnly test when auto-timezone is implemented based on wifi-location.
         if (Utils.isWifiOnly(getActivity()) || isFirstRun) {
             getPreferenceScreen().removePreference(mAutoTimeZonePref);
             autoTimeZoneEnabled = false;
         }
         mAutoTimeZonePref.setChecked(autoTimeZoneEnabled);

         mTimePref = findPreference("time");
         mTime24Pref = findPreference("24 hour");
         mTimeZone = findPreference("timezone");
         mDatePref = findPreference("date");
         mDateFormat = (ListPreference) findPreference(KEY_DATE_FORMAT);
         if (isFirstRun) {
             getPreferenceScreen().removePreference(mTime24Pref);
             getPreferenceScreen().removePreference(mDateFormat);
         }

         String [] dateFormats = getResources().getStringArray(R.array.date_format_values);
         String [] formattedDates = new String[dateFormats.length];
         String currentFormat = getDateFormat();
         // Initialize if DATE_FORMAT is not set in the system settings
         // This can happen after a factory reset (or data wipe)
         if (currentFormat == null) {
             currentFormat = "";
         }

         // Prevents duplicated values on date format selector.
         mDummyDate.set(mDummyDate.get(Calendar.YEAR), mDummyDate.DECEMBER, 31, 13, 0, 0);

         for (int i = 0; i < formattedDates.length; i++) {
             String formatted =
                     DateFormat.getDateFormatForSetting(getActivity(), dateFormats[i])
                     .format(mDummyDate.getTime());

             if (dateFormats[i].length() == 0) {
                 formattedDates[i] = getResources().
                     getString(R.string.normal_date_format, formatted);
             } else {
                 formattedDates[i] = formatted;
             }
         }

         mDateFormat.setEntries(formattedDates);
         mDateFormat.setEntryValues(R.array.date_format_values);
         mDateFormat.setValue(currentFormat);

         mTimePref.setEnabled(!autoTimeEnabled);
         mDatePref.setEnabled(!autoTimeEnabled);
         mTimeZone.setEnabled(!autoTimeZoneEnabled);
     }

     @Override
     public void onResume() {
         super.onResume();

         getPreferenceScreen().getSharedPreferences()
                 .registerOnSharedPreferenceChangeListener(this);

         ((CheckBoxPreference)mTime24Pref).setChecked(is24Hour());

         // Register for time ticks and other reasons for time change
         IntentFilter filter = new IntentFilter();
         filter.addAction(Intent.ACTION_TIME_TICK);
         filter.addAction(Intent.ACTION_TIME_CHANGED);
         filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
         getActivity().registerReceiver(mIntentReceiver, filter, null, null);

         updateTimeAndDateDisplay(getActivity());
     }

     @Override
     public void onPause() {
         super.onPause();
         getActivity().unregisterReceiver(mIntentReceiver);
         getPreferenceScreen().getSharedPreferences()
                 .unregisterOnSharedPreferenceChangeListener(this);
     }

     public void updateTimeAndDateDisplay(Context context) {
         java.text.DateFormat shortDateFormat = DateFormat.getDateFormat(context);
         final Calendar now = Calendar.getInstance();
         mDummyDate.setTimeZone(now.getTimeZone());
         // We use December 31st because it's unambiguous when demonstrating the date format.
         // We use 13:00 so we can demonstrate the 12/24 hour options.
         mDummyDate.set(now.get(Calendar.YEAR), 11, 31, 13, 0, 0);
         Date dummyDate = mDummyDate.getTime();
         mTimePref.setSummary(DateFormat.getTimeFormat(getActivity()).format(now.getTime()));
         mTimeZone.setSummary(getTimeZoneText(now.getTimeZone()));
         mDatePref.setSummary(shortDateFormat.format(now.getTime()));
         mDateFormat.setSummary(shortDateFormat.format(dummyDate));
         mTime24Pref.setSummary(DateFormat.getTimeFormat(getActivity()).format(dummyDate));
     }

     @Override
     public void onDateSet(DatePicker view, int year, int month, int day) {
         final Activity activity = getActivity();
         if (activity != null) {
             setDate(activity, year, month, day);
             updateTimeAndDateDisplay(activity);
         }
     }

     @Override
     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
         final Activity activity = getActivity();
         if (activity != null) {
             setTime(activity, hourOfDay, minute);
             updateTimeAndDateDisplay(activity);
         }

         // We don't need to call timeUpdated() here because the TIME_CHANGED
         // broadcast is sent by the AlarmManager as a side effect of setting the
         // SystemClock time.
     }

     @Override
     public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
         if (key.equals(KEY_DATE_FORMAT)) {
             String format = preferences.getString(key,
                     getResources().getString(R.string.default_date_format));
             Settings.System.putString(getContentResolver(),
                     Settings.System.DATE_FORMAT, format);
             updateTimeAndDateDisplay(getActivity());
         } else if (key.equals(KEY_AUTO_TIME)) {
             boolean autoEnabled = preferences.getBoolean(key, true);
             Settings.Global.putInt(getContentResolver(), Settings.Global.AUTO_TIME,
                     autoEnabled ? 1 : 0);
             mTimePref.setEnabled(!autoEnabled);
             mDatePref.setEnabled(!autoEnabled);
         } else if (key.equals(KEY_AUTO_TIME_ZONE)) {
             boolean autoZoneEnabled = preferences.getBoolean(key, true);
             Settings.Global.putInt(
                     getContentResolver(), Settings.Global.AUTO_TIME_ZONE, autoZoneEnabled ? 1 : 0);
             mTimeZone.setEnabled(!autoZoneEnabled);
         }
     }

     @Override
     public Dialog onCreateDialog(int id) {
         Dialog d;

         switch (id) {
         case DIALOG_DATEPICKER: {
             final Calendar calendar = Calendar.getInstance();
             d = new DatePickerDialog(
                 getActivity(),
                 this,
                 calendar.get(Calendar.YEAR),
                 calendar.get(Calendar.MONTH),
                 calendar.get(Calendar.DAY_OF_MONTH));
             // The system clock can't represent dates outside this range.
             DatePickerDialog datePicker = (DatePickerDialog)d;
             Calendar t = Calendar.getInstance();
             t.clear();
             t.set(1970, Calendar.JANUARY, 1);
             datePicker.getDatePicker().setMinDate(t.getTimeInMillis());
             t.clear();
             t.set(2037, Calendar.DECEMBER, 31);
             datePicker.getDatePicker().setMaxDate(t.getTimeInMillis());
             break;
         }
         case DIALOG_TIMEPICKER: {
             final Calendar calendar = Calendar.getInstance();
             d = new TimePickerDialog(
                     getActivity(),
                     this,
                     calendar.get(Calendar.HOUR_OF_DAY),
                     calendar.get(Calendar.MINUTE),
                     DateFormat.is24HourFormat(getActivity()));
             break;
         }
         default:
             d = null;
             break;
         }

         return d;
     }

     /*
     @Override
     public void onPrepareDialog(int id, Dialog d) {
         switch (id) {
         case DIALOG_DATEPICKER: {
             DatePickerDialog datePicker = (DatePickerDialog)d;
             final Calendar calendar = Calendar.getInstance();
             datePicker.updateDate(
                     calendar.get(Calendar.YEAR),
                     calendar.get(Calendar.MONTH),
                     calendar.get(Calendar.DAY_OF_MONTH));
             break;
         }
         case DIALOG_TIMEPICKER: {
             TimePickerDialog timePicker = (TimePickerDialog)d;
             final Calendar calendar = Calendar.getInstance();
             timePicker.updateTime(
                     calendar.get(Calendar.HOUR_OF_DAY),
                     calendar.get(Calendar.MINUTE));
             break;
         }
         default:
             break;
         }
     }
     */
     @Override
     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
         if (preference == mDatePref) {
             showDialog(DIALOG_DATEPICKER);
         } else if (preference == mTimePref) {
             // The 24-hour mode may have changed, so recreate the dialog
             removeDialog(DIALOG_TIMEPICKER);
             showDialog(DIALOG_TIMEPICKER);
         } else if (preference == mTime24Pref) {
             set24Hour(((CheckBoxPreference)mTime24Pref).isChecked());
             updateTimeAndDateDisplay(getActivity());
             timeUpdated();
         }
         return super.onPreferenceTreeClick(preferenceScreen, preference);
     }

     @Override
     public void onActivityResult(int requestCode, int resultCode,
             Intent data) {
         updateTimeAndDateDisplay(getActivity());
     }

     private void timeUpdated() {
         Intent timeChanged = new Intent(Intent.ACTION_TIME_CHANGED);
         getActivity().sendBroadcast(timeChanged);
     }

     /*  Get & Set values from the system settings  */

     private boolean is24Hour() {
         return DateFormat.is24HourFormat(getActivity());
     }

     private void set24Hour(boolean is24Hour) {
         Settings.System.putString(getContentResolver(),
                 Settings.System.TIME_12_24,
                 is24Hour? HOURS_24 : HOURS_12);
     }

     private String getDateFormat() {
         return Settings.System.getString(getContentResolver(),
                 Settings.System.DATE_FORMAT);
     }

     private boolean getAutoState(String name) {
         try {
             return Settings.Global.getInt(getContentResolver(), name) > 0;
         } catch (SettingNotFoundException snfe) {
             return false;
         }
     }

     /* package */ static void setDate(Context context, int year, int month, int day) {
         Calendar c = Calendar.getInstance();

         c.set(Calendar.YEAR, year);
         c.set(Calendar.MONTH, month);
         c.set(Calendar.DAY_OF_MONTH, day);
         long when = c.getTimeInMillis();

         if (when / 1000 < Integer.MAX_VALUE) {
             ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
         }
     }

     /* package */ static void setTime(Context context, int hourOfDay, int minute) {
         Calendar c = Calendar.getInstance();

         c.set(Calendar.HOUR_OF_DAY, hourOfDay);
         c.set(Calendar.MINUTE, minute);
         c.set(Calendar.SECOND, 0);
         c.set(Calendar.MILLISECOND, 0);
         long when = c.getTimeInMillis();

         if (when / 1000 < Integer.MAX_VALUE) {
             ((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
         }
     }

     /*  Helper routines to format timezone */

     /* package */ static String getTimeZoneText(TimeZone tz) {
         // Similar to new SimpleDateFormat("'GMT'Z, zzzz").format(new Date()), but
         // we want "GMT-03:00" rather than "GMT-0300".
         Date now = new Date();
         return formatOffset(new StringBuilder(), tz, now).
             append(", ").
             append(tz.getDisplayName(tz.inDaylightTime(now), TimeZone.LONG)).toString();
     }

     private static StringBuilder formatOffset(StringBuilder sb, TimeZone tz, Date d) {
         int off = tz.getOffset(d.getTime()) / 1000 / 60;

         sb.append("GMT");
         if (off < 0) {
             sb.append('-');
             off = -off;
         } else {
             sb.append('+');
         }

         int hours = off / 60;
         int minutes = off % 60;

         sb.append((char) ('0' + hours / 10));
         sb.append((char) ('0' + hours % 10));

         sb.append(':');

         sb.append((char) ('0' + minutes / 10));
         sb.append((char) ('0' + minutes % 10));

         return sb;
     }

     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             final Activity activity = getActivity();
             if (activity != null) {
                 updateTimeAndDateDisplay(activity);
             }
         }
     };
 }
	/*
	* Copyright (C) 2008 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.settings;

	import android.app.Activity;
	import android.app.AlarmManager;
	import android.app.DatePickerDialog;
	import android.app.Dialog;
	import android.app.TimePickerDialog;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.content.SharedPreferences;
	import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
	import android.os.Bundle;
	import android.os.SystemClock;
	import android.preference.CheckBoxPreference;
	import android.preference.ListPreference;
	import android.preference.Preference;
	import android.preference.PreferenceScreen;
	import android.provider.Settings;
	import android.provider.Settings.SettingNotFoundException;
	import android.text.format.DateFormat;
	import android.widget.DatePicker;
	import android.widget.TimePicker;

	import java.util.Calendar;
	import java.util.Date;
	import java.util.TimeZone;

	public class DateTimeSettings extends SettingsPreferenceFragment
	implements OnSharedPreferenceChangeListener,
	TimePickerDialog.OnTimeSetListener, DatePickerDialog.OnDateSetListener {

	private static final String HOURS_12 = "12";
	private static final String HOURS_24 = "24";

	// Used for showing the current date format, which looks like "12/31/2010", "2010/12/13", etc.
	// The date value is dummy (independent of actual date).
	private Calendar mDummyDate;

	private static final String KEY_DATE_FORMAT = "date_format";
	private static final String KEY_AUTO_TIME = "auto_time";
	private static final String KEY_AUTO_TIME_ZONE = "auto_zone";

	private static final int DIALOG_DATEPICKER = 0;
	private static final int DIALOG_TIMEPICKER = 1;

	// have we been launched from the setup wizard?
	protected static final String EXTRA_IS_FIRST_RUN = "firstRun";

	private CheckBoxPreference mAutoTimePref;
	private Preference mTimePref;
	private Preference mTime24Pref;
	private CheckBoxPreference mAutoTimeZonePref;
	private Preference mTimeZone;
	private Preference mDatePref;
	private ListPreference mDateFormat;

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

	addPreferencesFromResource(R.xml.date_time_prefs);

	initUI();
	}

	private void initUI() {
	boolean autoTimeEnabled = getAutoState(Settings.Global.AUTO_TIME);
	boolean autoTimeZoneEnabled = getAutoState(Settings.Global.AUTO_TIME_ZONE);

	Intent intent = getActivity().getIntent();
	boolean isFirstRun = intent.getBooleanExtra(EXTRA_IS_FIRST_RUN, false);

	mDummyDate = Calendar.getInstance();

	mAutoTimePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME);
	mAutoTimePref.setChecked(autoTimeEnabled);
	mAutoTimeZonePref = (CheckBoxPreference) findPreference(KEY_AUTO_TIME_ZONE);
	// Override auto-timezone if it's a wifi-only device or if we're still in setup wizard.
	// TODO: Remove the wifiOnly test when auto-timezone is implemented based on wifi-location.
	if (Utils.isWifiOnly(getActivity()) \|\| isFirstRun) {
	getPreferenceScreen().removePreference(mAutoTimeZonePref);
	autoTimeZoneEnabled = false;
	}
	mAutoTimeZonePref.setChecked(autoTimeZoneEnabled);

	mTimePref = findPreference("time");
	mTime24Pref = findPreference("24 hour");
	mTimeZone = findPreference("timezone");
	mDatePref = findPreference("date");
	mDateFormat = (ListPreference) findPreference(KEY_DATE_FORMAT);
	if (isFirstRun) {
	getPreferenceScreen().removePreference(mTime24Pref);
	getPreferenceScreen().removePreference(mDateFormat);
	}

	String [] dateFormats = getResources().getStringArray(R.array.date_format_values);
	String [] formattedDates = new String[dateFormats.length];
	String currentFormat = getDateFormat();
	// Initialize if DATE_FORMAT is not set in the system settings
	// This can happen after a factory reset (or data wipe)
	if (currentFormat == null) {
	currentFormat = "";
	}

	// Prevents duplicated values on date format selector.
	mDummyDate.set(mDummyDate.get(Calendar.YEAR), mDummyDate.DECEMBER, 31, 13, 0, 0);

	for (int i = 0; i < formattedDates.length; i++) {
	String formatted =
	DateFormat.getDateFormatForSetting(getActivity(), dateFormats[i])
	.format(mDummyDate.getTime());

	if (dateFormats[i].length() == 0) {
	formattedDates[i] = getResources().
	getString(R.string.normal_date_format, formatted);
	} else {
	formattedDates[i] = formatted;
	}
	}

	mDateFormat.setEntries(formattedDates);
	mDateFormat.setEntryValues(R.array.date_format_values);
	mDateFormat.setValue(currentFormat);

	mTimePref.setEnabled(!autoTimeEnabled);
	mDatePref.setEnabled(!autoTimeEnabled);
	mTimeZone.setEnabled(!autoTimeZoneEnabled);
	}

	@Override
	public void onResume() {
	super.onResume();

	getPreferenceScreen().getSharedPreferences()
	.registerOnSharedPreferenceChangeListener(this);

	((CheckBoxPreference)mTime24Pref).setChecked(is24Hour());

	// Register for time ticks and other reasons for time change
	IntentFilter filter = new IntentFilter();
	filter.addAction(Intent.ACTION_TIME_TICK);
	filter.addAction(Intent.ACTION_TIME_CHANGED);
	filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
	getActivity().registerReceiver(mIntentReceiver, filter, null, null);

	updateTimeAndDateDisplay(getActivity());
	}

	@Override
	public void onPause() {
	super.onPause();
	getActivity().unregisterReceiver(mIntentReceiver);
	getPreferenceScreen().getSharedPreferences()
	.unregisterOnSharedPreferenceChangeListener(this);
	}

	public void updateTimeAndDateDisplay(Context context) {
	java.text.DateFormat shortDateFormat = DateFormat.getDateFormat(context);
	final Calendar now = Calendar.getInstance();
	mDummyDate.setTimeZone(now.getTimeZone());
	// We use December 31st because it's unambiguous when demonstrating the date format.
	// We use 13:00 so we can demonstrate the 12/24 hour options.
	mDummyDate.set(now.get(Calendar.YEAR), 11, 31, 13, 0, 0);
	Date dummyDate = mDummyDate.getTime();
	mTimePref.setSummary(DateFormat.getTimeFormat(getActivity()).format(now.getTime()));
	mTimeZone.setSummary(getTimeZoneText(now.getTimeZone()));
	mDatePref.setSummary(shortDateFormat.format(now.getTime()));
	mDateFormat.setSummary(shortDateFormat.format(dummyDate));
	mTime24Pref.setSummary(DateFormat.getTimeFormat(getActivity()).format(dummyDate));
	}

	@Override
	public void onDateSet(DatePicker view, int year, int month, int day) {
	final Activity activity = getActivity();
	if (activity != null) {
	setDate(activity, year, month, day);
	updateTimeAndDateDisplay(activity);
	}
	}

	@Override
	public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
	final Activity activity = getActivity();
	if (activity != null) {
	setTime(activity, hourOfDay, minute);
	updateTimeAndDateDisplay(activity);
	}

	// We don't need to call timeUpdated() here because the TIME_CHANGED
	// broadcast is sent by the AlarmManager as a side effect of setting the
	// SystemClock time.
	}

	@Override
	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
	if (key.equals(KEY_DATE_FORMAT)) {
	String format = preferences.getString(key,
	getResources().getString(R.string.default_date_format));
	Settings.System.putString(getContentResolver(),
	Settings.System.DATE_FORMAT, format);
	updateTimeAndDateDisplay(getActivity());
	} else if (key.equals(KEY_AUTO_TIME)) {
	boolean autoEnabled = preferences.getBoolean(key, true);
	Settings.Global.putInt(getContentResolver(), Settings.Global.AUTO_TIME,
	autoEnabled ? 1 : 0);
	mTimePref.setEnabled(!autoEnabled);
	mDatePref.setEnabled(!autoEnabled);
	} else if (key.equals(KEY_AUTO_TIME_ZONE)) {
	boolean autoZoneEnabled = preferences.getBoolean(key, true);
	Settings.Global.putInt(
	getContentResolver(), Settings.Global.AUTO_TIME_ZONE, autoZoneEnabled ? 1 : 0);
	mTimeZone.setEnabled(!autoZoneEnabled);
	}
	}

	@Override
	public Dialog onCreateDialog(int id) {
	Dialog d;

	switch (id) {
	case DIALOG_DATEPICKER: {
	final Calendar calendar = Calendar.getInstance();
	d = new DatePickerDialog(
	getActivity(),
	this,
	calendar.get(Calendar.YEAR),
	calendar.get(Calendar.MONTH),
	calendar.get(Calendar.DAY_OF_MONTH));
	// The system clock can't represent dates outside this range.
	DatePickerDialog datePicker = (DatePickerDialog)d;
	Calendar t = Calendar.getInstance();
	t.clear();
	t.set(1970, Calendar.JANUARY, 1);
	datePicker.getDatePicker().setMinDate(t.getTimeInMillis());
	t.clear();
	t.set(2037, Calendar.DECEMBER, 31);
	datePicker.getDatePicker().setMaxDate(t.getTimeInMillis());
	break;
	}
	case DIALOG_TIMEPICKER: {
	final Calendar calendar = Calendar.getInstance();
	d = new TimePickerDialog(
	getActivity(),
	this,
	calendar.get(Calendar.HOUR_OF_DAY),
	calendar.get(Calendar.MINUTE),
	DateFormat.is24HourFormat(getActivity()));
	break;
	}
	default:
	d = null;
	break;
	}

	return d;
	}

	/*
	@Override
	public void onPrepareDialog(int id, Dialog d) {
	switch (id) {
	case DIALOG_DATEPICKER: {
	DatePickerDialog datePicker = (DatePickerDialog)d;
	final Calendar calendar = Calendar.getInstance();
	datePicker.updateDate(
	calendar.get(Calendar.YEAR),
	calendar.get(Calendar.MONTH),
	calendar.get(Calendar.DAY_OF_MONTH));
	break;
	}
	case DIALOG_TIMEPICKER: {
	TimePickerDialog timePicker = (TimePickerDialog)d;
	final Calendar calendar = Calendar.getInstance();
	timePicker.updateTime(
	calendar.get(Calendar.HOUR_OF_DAY),
	calendar.get(Calendar.MINUTE));
	break;
	}
	default:
	break;
	}
	}
	*/
	@Override
	public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
	if (preference == mDatePref) {
	showDialog(DIALOG_DATEPICKER);
	} else if (preference == mTimePref) {
	// The 24-hour mode may have changed, so recreate the dialog
	removeDialog(DIALOG_TIMEPICKER);
	showDialog(DIALOG_TIMEPICKER);
	} else if (preference == mTime24Pref) {
	set24Hour(((CheckBoxPreference)mTime24Pref).isChecked());
	updateTimeAndDateDisplay(getActivity());
	timeUpdated();
	}
	return super.onPreferenceTreeClick(preferenceScreen, preference);
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode,
	Intent data) {
	updateTimeAndDateDisplay(getActivity());
	}

	private void timeUpdated() {
	Intent timeChanged = new Intent(Intent.ACTION_TIME_CHANGED);
	getActivity().sendBroadcast(timeChanged);
	}

	/* Get & Set values from the system settings */

	private boolean is24Hour() {
	return DateFormat.is24HourFormat(getActivity());
	}

	private void set24Hour(boolean is24Hour) {
	Settings.System.putString(getContentResolver(),
	Settings.System.TIME_12_24,
	is24Hour? HOURS_24 : HOURS_12);
	}

	private String getDateFormat() {
	return Settings.System.getString(getContentResolver(),
	Settings.System.DATE_FORMAT);
	}

	private boolean getAutoState(String name) {
	try {
	return Settings.Global.getInt(getContentResolver(), name) > 0;
	} catch (SettingNotFoundException snfe) {
	return false;
	}
	}

	/* package */ static void setDate(Context context, int year, int month, int day) {
	Calendar c = Calendar.getInstance();

	c.set(Calendar.YEAR, year);
	c.set(Calendar.MONTH, month);
	c.set(Calendar.DAY_OF_MONTH, day);
	long when = c.getTimeInMillis();

	if (when / 1000 < Integer.MAX_VALUE) {
	((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
	}
	}

	/* package */ static void setTime(Context context, int hourOfDay, int minute) {
	Calendar c = Calendar.getInstance();

	c.set(Calendar.HOUR_OF_DAY, hourOfDay);
	c.set(Calendar.MINUTE, minute);
	c.set(Calendar.SECOND, 0);
	c.set(Calendar.MILLISECOND, 0);
	long when = c.getTimeInMillis();

	if (when / 1000 < Integer.MAX_VALUE) {
	((AlarmManager) context.getSystemService(Context.ALARM_SERVICE)).setTime(when);
	}
	}

	/* Helper routines to format timezone */

	/* package */ static String getTimeZoneText(TimeZone tz) {
	// Similar to new SimpleDateFormat("'GMT'Z, zzzz").format(new Date()), but
	// we want "GMT-03:00" rather than "GMT-0300".
	Date now = new Date();
	return formatOffset(new StringBuilder(), tz, now).
	append(", ").
	append(tz.getDisplayName(tz.inDaylightTime(now), TimeZone.LONG)).toString();
	}

	private static StringBuilder formatOffset(StringBuilder sb, TimeZone tz, Date d) {
	int off = tz.getOffset(d.getTime()) / 1000 / 60;

	sb.append("GMT");
	if (off < 0) {
	sb.append('-');
	off = -off;
	} else {
	sb.append('+');
	}

	int hours = off / 60;
	int minutes = off % 60;

	sb.append((char) ('0' + hours / 10));
	sb.append((char) ('0' + hours % 10));

	sb.append(':');

	sb.append((char) ('0' + minutes / 10));
	sb.append((char) ('0' + minutes % 10));

	return sb;
	}

	private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	final Activity activity = getActivity();
	if (activity != null) {
	updateTimeAndDateDisplay(activity);
	}
	}
	};
	}