Android Location Promixity Query
I'm working on an app, where I need to determine which sqlite rows are closest to me given my current lat/long. I have a table with lat and long columns, I'm just having a bit of trouble working out how to get ones that are closest based on my dev开发者_如何学编程ices current location. Any help would be appreciated.
In this kind of situations you can use the Manhatten Distance. Let's suppose your current position is:
myPosition_Lat = XX
myPosition_Long = YY
And, that you have an array with the all the coordinates (all_stops[]
). You just have to go over all items in all_stops[]
and calculate the distance to myPosition
, and save the minimum distance this way:
distance = Math.abs(myPosition_Lat - the_Lat) + Math.abs(myPosition_Long – the_Long);
Here the_Lat
and the_Long
contain the latitude and longitud you are calculating with.
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