问题描述
我正在通过 LocationManager.requestLocationUpdates() 使用 LocationManager.GPS_PROVIDER 跟踪 GPS 位置并注册 LocationListener.
I'm tracking GPS locations with LocationManager.requestLocationUpdates() using LocationManager.GPS_PROVIDER and registering a LocationListener.
我的问题:
所有经过测试的设备(Sony neo、Sony active、Moto G)都会生成 Location 对象，这些对象在其 getTime() 中没有几分之一秒:
All tested devices (Sony neo, Sony active, Moto G) produce Location objects which do not have fractions of a second in their getTime():
<trkpt ...><time>2014-05-24T10:24:59.000Z</time></trkpt>
<trkpt ...><time>2014-05-24T10:25:00.000Z</time></trkpt>
<trkpt ...><time>2014-05-24T10:25:01.000Z</time></trkpt>
<trkpt ...><time>2014-05-24T10:25:02.000Z</time></trkpt>
<trkpt ...><time>2014-05-24T10:25:03.000Z</time></trkpt>
当我计算速度、倾斜和与气压高度合并时，1 秒(1000 毫秒)的分辨率太不精确了.而且我不相信所有的修复都是完全在.000.
As I'm calculating speed, incline and merge with barometic altitude, 1s (1000ms) resolution is way too imprecise. And I do not believe, that the fixes are all exactly at .000.
我的问题:
最好将 System.currentTimeMillis() 作为我的跟踪点的时间戳，或者 GPS 定位通常远远落后于实时"，并且计算出的位置实际上是来自过去(落后几秒)?
Is is better to take System.currentTimeMillis() as the timestamp for my track-points, or is the GPS fix generally far behind "real time" and the calculated positions are actually those from the past (several seconds behind)?
备注:
- 我知道在使用 GPS 数据时速度计算并不精确且相当复杂
- 这不是 Matching Location.getTime() 毫秒到 NMEA 语句 的副本
推荐答案
根据我的经验，System.currentTimeMillis() 是一种更好的获取时间戳的方法，这就是我正在做的事情我的应用程序.但是，请注意，如 android 开发者网站所述，System.currentTimeMillis() 返回自 1970 年 1 月 1 日 00:00:00.0 UTC 以来的当前时间(以毫秒为单位) 所以它真的取决于什么你想用它.正如我所提到的，我发现它比其他形式的时间戳更可靠，它可能最适合您的情况.
In my experience, System.currentTimeMillis() is a much better way to take timestamps, and it is what I am doing in my app. However, please be advised that, as stated on the android developer site, System.currentTimeMillis() Returns the current time in milliseconds since January 1, 1970 00:00:00.0 UTC so it really depends on what you want to use it for. As I mentioned though, I found it to be more reliable than other forms of timestamps and it is probably best suited for your case.
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