Android 根据两点经纬度计算直线距离

//
计算两点距离

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private

final

double

EARTH_RADIUS
= 

6378137.0

; 

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private

double

GetDistance(

double

lat_a, 

double

lng_a, 

double

lat_b, 

double

lng_b)
{

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double

radLat1
= (lat_a * Math.PI / 

180.0

);

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double

radLat2
= (lat_b * Math.PI / 

180.0

);

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double

a
= radLat1 - radLat2;

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double

b
= (lng_a - lng_b) * Math.PI / 

180.0

;

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double

s
= 

2

*
Math.asin(Math.sqrt(Math.pow(Math.sin(a / 

2

), 

2

)

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+
Math.cos(radLat1) * Math.cos(radLat2)

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*
Math.pow(Math.sin(b / 

2

), 

2

)));

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s
= s * EARTH_RADIUS;

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s
= Math.Round(s * 

10000

)
/ 

10000

;

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return

s;

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}