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