我该如何决定使用requestLocationUpdates什么区间？ [英] How do I decide what interval to use for requestLocationUpdates?

问题描述

<一个href="http://developer.android.com/reference/android/location/LocationManager.html#requestLocationUpdates%28java.lang.String,%20long,%20float,%20android.location.LocationListener%29"><$c$c>LocationManager#requestLocationUpdates可以让你传递一个minTime和minDistance依旧参数。我有一个很难决定什么这些数字应该和可能AP preciate一些指导。

我们的应用程序是不是转由turn导航的应用程序;我只是想告诉关心的10最近点。由于我显示最近的10，就可以得到一点点陈旧，但如果用户在移动的车辆，我想/需要经常更新它们pretty的，以避免过时。

我想很多人都在模糊的要求相同的位置：我不希望数据过于陈旧，但我不想浪费电池。我怎样才能把这些含糊的要求转化为具体的数字？

解决方案

  ***＆LT;编辑＆gt; ***
作为软糖的，所述标准是（minTime＆安培; minDistance依旧），因此它具有
同时满足以返回一个位置。
***＆LT; /编辑＆gt; ***
 

根据您的问题

，我听起来像minTime参数是不相关的。

您真正需要担心的是minDistance依旧，因此，如果用户是在快速移动的车辆，它会保持什么。

如果一个人驾驶60英里，他们移动约27方米秒。

考虑到这一性判据......我要说的使用方法：

minTime = 60000 //每60秒更新
minDistance依旧= 90 //在快速移动的车辆，它会更新一次，大约每3秒

LocationManager#requestLocationUpdates allows you to pass in a minTime and minDistance parameter. I'm having a hard time deciding what these numbers should be, and could appreciate some guidance.

Our app is not a turn-by-turn navigation app; I just want to show the 10 nearest points of interest. Since I'm showing the 10 nearest, they can get a little stale, but if the user is in a moving vehicle, I'd want/need to update them pretty frequently to avoid staleness.

I imagine a lot of people are in the same position of vague requirements: "I don't want the data to be too stale, but I don't want to waste battery." How can I turn these vague requirements into concrete numbers?

解决方案

***<Edit>***
As of JellyBean, the criteria is (minTime & minDistance), so it has 
to satisfy both to return a location.
***</Edit>***

Based on your problem, it sounds to me like the minTime parameter is irrelevant.

What you really need to worry about is minDistance, so that if a user is in a fast moving vehicle, it will keep up.

If a person is driving 60 MPH, they move about 27 meters per second.

Considering this critera... I would say to use:

minTime = 60000 // update every 60 seconds
minDistance = 90 // in a fast moving vehicle, it will update roughly once every 3 seconds

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