如何获得直线距离之间的两个位置中的Andr​​oid？ [英] How to get straight distance between two location in android?

问题描述

首先阅读问题仔细...

First read Question carefully ...

我需要的直线距离 不走路，汽车，或等。

看看下面这给这一形象，

Take a look to this image which given below,

谷歌提供给我们距离车和驾驶。

Google provide us distance by car and driving.

但我不想要它，我想直线距离之间的两个位置（纬度 - 经度）

But I don't want it, I want straight distance between two location (latitude - longitude).

将显示为为红线。

注意：我不希望把红线在谷歌地图，只是想在单位的远程（英里，公里等）

NOTE : I don't want to put red line on Google map, just want the Distance in Units(mile,km,etc.)

推荐答案

机器人

double distance

Location locationA = new Location("point A")

locationA.setLatitude(latA);

locationA.setLongitude(lngA);

Location locationB = new Location("point B");

locationB.setLatitude(latB);

LocationB.setLongitude(lngB);

distance = locationA.distanceTo(locationB);

MATHEMATICALY

a = distance in degrees //meterConversion = 1609;

b = 90 - latitude of point 1

c = 90 - latitude of point 2

l = longitude of point 1 - longitude of point 2

Cos(a) = Cos(b)Cos(c) + Sin(b)Sin(c)Sin(l)

d = circumference of Earth * a / 360 // circumference of Earth = 3958.7558657440545D km

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