android - 如何在android中获取确切的当前移动时间？

Question

我想从手机中获取确切的当前时间并将其发送到服务器。但它在 25 分钟附近变化并不完全......它的变化

我无法获得正确的系统时间

在这里我展示了代码，我尝试过的

final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+5:30"));
int hr = cal.get(Calendar.HOUR_OF_DAY);
int min = cal.get(Calendar.MINUTE);
int sec = cal.get(Calendar.SECOND);

int day = cal.get(Calendar.DAY_OF_MONTH);
int month = cal.get(Calendar.MONTH);
int year = cal.get(Calendar.YEAR);
String date;
SimpleDateFormat sdf = new SimpleDateFormat("dd:mm:yyyy HH:mm:ss z");
String test = sdf.format(cal.getTime());
String months = String.valueOf(month + 1);
String days = String.valueOf(day);
String years = String.valueOf(year);
String time = hr+":"+min+":"+sec;

请帮我解决这个问题。

Answer 1

long millis =System.currentTimeMillis;
String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
    TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
    TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));    
Log.i("Time H:M:s",hms);

Answer 2

long timeInMillis = System.currentTimeMillis();

      Calendar cal = Calendar.getInstance();
      cal.setTimeInMillis(timeInMillis);

现在使用其余代码获取数据

Answer 3

以特定模式获取日期和时间：

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
String currentDateandTime = sdf.format(new Date());