Android 系统时间设置

一、自动确定时间

    /**     * Get if the user prefers the date, time and timezone to be automatically fetched from the network      * @param context Context     * @return ture=yes, false=no     */    public static boolean getTimeSettingAuto(Context context) {        //Settings.System.AUTO_TIME was deprecated in API level 17.        //Use Settings.Global.AUTO_TIME instead.        int state = Settings.System.getInt(context.getContentResolver(), Settings.System.AUTO_TIME, 1);        return (state == 1) ? true : false;    }        public static void setTimeSettingAuto(Context context, boolean isAuto) {        Settings.System.putInt(context.getContentResolver(), Settings.System.AUTO_TIME, (isAuto ? 1 : 0));    }

二、自动确定时区（API11开始生效）

    /**     * Get if the user prefers the timezone to be automatically fetched from the network      * @param context Context     * @return ture=yes, false=no     */    public static boolean getTimezoneSettingAuto(Context context) {        //Settings.System.AUTO_TIME_ZONE was useful from API 11.        //Settings.System.AUTO_TIME_ZONE was deprecated in API level 17.        //Use Settings.Global.AUTO_TIME_ZONE instead.        int state = Settings.System.getInt(context.getContentResolver(), Settings.System.AUTO_TIME_ZONE, 1);        return (state == 1) ? true : false;    }        public static void setTimezoneSettingAuto(Context context, boolean isAuto) {        Settings.System.putInt(context.getContentResolver(), Settings.System.AUTO_TIME_ZONE, (isAuto ? 1 : 0));    }

三、时间格式24/12

    /**     * Get Display times style(12 or 24 hours)     * @param context Context     * @return ture=24, false=12     */    public static boolean is24HourFormat(Context context) {        //Can use this to instand        //return DateFormat.is24HourFormat(context);        int state = Settings.System.getInt(context.getContentResolver(), Settings.System.TIME_12_24, 24);        return (state == 24) ? true : false;    }        public static void set24HourFormat(Context context, boolean is24Style) {        Settings.System.putInt(context.getContentResolver(), Settings.System.TIME_12_24, (is24Style ? 24 : 12));        //Do not forget to inform system.        Intent intent = new Intent(Intent.ACTION_TIME_CHANGED);        context.sendBroadcast(intent);    }

四、时区

    public static String getTimezoneId() {        final TimeZone timeZone = TimeZone.getDefault();        String id = timeZone.getID();        return id;    }        public static void setTimezone(Context context, String zoneId) {        final AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);        alarmManager.setTimeZone(zoneId);        //DO not need send Intent.ACTION_TIMEZONE_CHANGED        //Because system will send itself, and we do not have permission    }

设置时区时需要添加权限

<uses-permission android:name="android.permission.SET_TIME_ZONE" />

获取以及设置时区用到的都是TimezoneID，它们以字符串的形式存在。

可以用诸如"GMT+05:00", "GMT+0500", "GMT+5:00","GMT+500","GMT+05", and"GMT+5","GMT-05:00"的ID

Android系统用的ID一般为

<timezone id="Asia/Shanghai">中国标准时间 (北京)</timezone><timezone id="Asia/Hong_Kong">香港时间 (香港)</timezone><timezone id="Asia/Taipei">台北时间 (台北)</timezone><timezone id="Asia/Seoul">首尔</timezone><timezone id="Asia/Tokyo">日本时间 (东京)</timezone>

五、系统时间

        Calendar calendar = Calendar.getInstance();        mTimePicker.setIs24HourView(DateFormat.is24HourFormat(this));        mTimePicker.setCurrentHour(calendar.get(Calendar.HOUR_OF_DAY));        mTimePicker.setCurrentMinute(calendar.get(Calendar.MINUTE));

    public static void setTime(int hour, int minute) {        Calendar calendar = Calendar.getInstance();                //Calendar.HOUR_OF_DAY use 24 hour format        //Calendar.HOUR_OF use 12 hour format, and we have to use calendar.set(Calendar.AM_PM, Calendar.PM);        calendar.set(Calendar.HOUR_OF_DAY, hour);        calendar.set(Calendar.MINUTE, minute);        calendar.set(Calendar.SECOND, 0);                long millis = calendar.getTimeInMillis();        if ((millis / 1000) < Integer.MAX_VALUE) {            SystemClock.setCurrentTimeMillis(millis);        }    }

但是SystemClock.setCurrentTimeMillis(millis);需要系统权限，解决办法请参见 增加修改系统时间权限

或者调出系统时间设置界面 startActivityForResult(new Intent(android.provider.Settings.ACTION_DATE_SETTINGS), 1);

六、日期格式

    public static String getDateFormat(Context context) {        String fromat = Settings.System.getString(context.getContentResolver(), Settings.System.DATE_FORMAT);        return fromat;    }        public static void setDateFormat(Context context, String dateFormat) {        Settings.System.putString(context.getContentResolver(), Settings.System.DATE_FORMAT, dateFormat);    }

日期格式一般的形式为：yyyy/MM/dd、yyyy MMM d、yyyy-MM-dd、yyyyMMdd

七、系统日期

        Calendar calendar = Calendar.getInstance();        mDatePicker.updateDate(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DATE));

    public static void setDate(int year, int month, int day) {        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.YEAR, year);        calendar.set(Calendar.MONTH, month);        calendar.set(Calendar.DATE, day);                long millis = calendar.getTimeInMillis();        if ((millis / 1000) < Integer.MAX_VALUE) {            SystemClock.setCurrentTimeMillis(millis);        }    }

同样的，SystemClock.setCurrentTimeMillis(millis);需要系统权限，解决办法请参见 增加修改系统时间权限