Android实践 -- 设置系统日期时间和时区

转自：https://www.cnblogs.com/Free-Thinker/p/6627813.html

设置系统日期时间和时区

设置系统的日期时间和时区，需要 系统权限和系统签名，

android:sharedUserId="android.uid.system"

需要在manifest文件中添加相应的权限

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

判断系统使用的是24小时制还是12小时制

boolean is24Hour =  DateFormat.is24HourFormat(mContext);

设置系统的小时制

24小时制

android.provider.Settings.System.putString(mContext.getContentResolver(),
android.provider.Settings.System.TIME_12_24, "24");

12小时制

android.provider.Settings.System.putString(mContext.getContentResolver(),
android.provider.Settings.System.TIME_12_24, "12");

判断系统的时区是否是自动获取的

public boolean isTimeZoneAuto(){
try {
return  android.provider.Settings.Global.getInt(mContext.getContentResolver(),
android.provider.Settings.Global.AUTO_TIME_ZONE) > 0;
} catch (SettingNotFoundException e) {
e.printStackTrace();
return false;
}
}

设置系统的时区是否自动获取

public void setAutoTimeZone(int checked){
android.provider.Settings.Global.putInt(mContext.getContentResolver(),
android.provider.Settings.Global.AUTO_TIME_ZONE, checked);
}

判断系统的时间是否自动获取的

public boolean isDateTimeAuto(){
try {
return android.provider.Settings.Global.getInt(mContext.getContentResolver(),
android.provider.Settings.Global.AUTO_TIME) > 0;
} catch (SettingNotFoundException e) {
e.printStackTrace();
return false;
}
}

设置系统的时间是否需要自动获取

public void setAutoDateTime(int checked){
android.provider.Settings.Global.putInt(mContext.getContentResolver(),
android.provider.Settings.Global.AUTO_TIME, checked);
}

设置系统日期
参考系统Settings中的源码

public void setSysDate(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)mContext.getSystemService(Context.ALARM_SERVICE)).setTime(when);
}
}

设置系统时间
参考系统Settings中的源码

public void setSysTime(int hour,int minute){
Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, hour);
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)mContext.getSystemService(Context.ALARM_SERVICE)).setTime(when);
}
}

设置系统时区

public void setTimeZone(String timeZone){
final Calendar now = Calendar.getInstance();
TimeZone tz = TimeZone.getTimeZone(timeZone);
now.setTimeZone(tz);
}

获取系统当前的时区

public String getDefaultTimeZone(){
return TimeZone.getDefault().getDisplayName();
}