Android latitude longitude with radius

Question

I have an app where the user marks locations such as home, office etc. The latitude and longitude data for these locations are stored in sqlite DB. I am periodically checking the users current location. I want to check if the users current location falls in to a radius of a marked location.

Example, users coordinates for home are (a,b) how to find if the current coordinates (m,n) falls under a radius of 0.5 Km of home.

score 3 · Answer 1 · answered Aug 19 '12 at 06:21

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You can just measure distance between two locations using Location.distanceTo() or Location.distanceBetween() methods. If the calculated distance is less than 500m, than it falls under the required radius. Hope this helps.

answered Aug 19 '12 at 06:21

Egor

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we have a winner, no need for complex solutions if the SDK has these methods available. – slinden77 Aug 19 '12 at 10:47

score 1 · Answer 2 · edited May 23 '17 at 11:56

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For distance measuring between two coordinates you can find a solution here:

Calculating distance between two geographic locations

Also you can make a database query to sort your records by distance: http://forums.phpfreaks.com/index.php?topic=175951.0

edited May 23 '17 at 11:56

Community

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answered Aug 19 '12 at 10:19

Amir

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score 0 · Answer 3 · answered Aug 19 '12 at 10:01

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or, the old fashioned way: radius = sqrt( (m-a)^2 + (n-b)^2 ) assuming flat earth model. Once your distance is very great, this formula no longer applies

answered Aug 19 '12 at 10:01

Martin

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Android latitude longitude with radius

3 Answers3