Question

android怎么计算两个坐标点之间的距离

Answer 1

千 锋扣丁学堂android开发为您解答：
public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)

Java code?

Parameters
startLatitude the starting latitude
startLongitude the starting longitude
endLatitude the ending latitude
endLongitude the ending longitude
results an array of floats to hold the results
详细解释见这里： distanceBetween(double, double, double, double, float[])
在大量坐标之间找最近距离的坐标
如果你用Mongodb，获取最近的坐标很简单，Mongodb自带geoNearCommand,可以参照这里：GeospatialIndexing-geoNearCommand

Java code?
> db.runCommand( { geoNear : "places" , near : [50,50], num : 10 } );
> db.runCommand({geoNear:"asdf", near:[50,50]})
{
"ns" : "test.places",
"near" : "1100110000001111110000001111110000001111110000001111",
"results" : [
{
"dis" : 69.29646421910687,
"obj" : {
"_id" : ObjectId("4b8bd6b93b83c574d8760280"),
"y" : [
1,
1
],
"category" : "Coffee"
}
},
{
"dis" : 69.29646421910687,
"obj" : {
"_id" : ObjectId("4b8bd6b03b83c574d876027f"),
"y" : [
1,
1
]
}
}
],
"stats" : {
"time" : 0,
"btreelocs" : 1,
"btreelocs" : 1,
"nscanned" : 2,
"nscanned" : 2,
"objectsLoaded" : 2,
"objectsLoaded" : 2,
"avgDistance" : 69.29646421910687
},
"ok" : 1
}