如何更新系统时间和时区? [英] How to update system time and time zone?

问题描述

我正在尝试更新系统时间和时区.这是系统应用程序.因此，我授予了系统应用程序权限.我的代码是

I am trying to update the system time and time zone. This is system application. So I gave system application permissions. My code is

    try {

        AlarmManager alarmManager =
                (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(getSelectedDateFormat(mSelectedDateFormat)
                .parse(mEtDate.getText() +" "+ mEtTime.getText()));
        alarmManager.setTimeZone(mSpTimeZone.getSelectedItem().toString());
        alarmManager.setTime(calendar.getTimeInMillis());

    } catch (ParseException e) {
        e.printStackTrace();
    }
}

在这里，当我立即更新TimeZone和Time时，Time错误地更新了.如果我一个人更新时间，它会完美更新.知道我做错了什么吗?

Here when I update TimeZone and Time at a moment, Time is update wrongly. If I update time alone it update perfectly. Any idea what I am did wrong?

推荐答案

不允许所有系统应用程序更改时区.

All system apps are not permitted to change the time zone.

在您的应用程序的make文件中，确保您具有以下标记

In your application make file make sure that you have following tag

LOCAL_PRIVILEGED_MODULE := true

仅允许system/priv-app设置时区.

Only the system/priv-app are permitted to set the time zone.

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