Show locations near user's location

Question

I'm developing an app and I'm trying to implement a means of listing stores close to the user's current location using the android mapbox SDK. Can anyone give a help how can I implement this?

Answer 1

You could use the Mapbox Tilequery API to query Points in the building layer of the Mapbox Streets style. Check the type property for each Feature that is in the API response's FeatureCollection. Check that the type is a store, rather than coffee shops, salons, etc. Use the LocationComponent's getLastKnownLocation as the query coordinate.

https://docs.mapbox.com/android/java/examples/tilequery

https://docs.mapbox.com/android/maps/examples/show-a-users-location

If you want to listen to device location changes: https://docs.mapbox.com/help/tutorials/android-location-listening/

Or you could query rendered Features on a specific layer:

https://docs.mapbox.com/android/maps/overview/query/

https://github.com/mapbox/mapbox-android-demo/search?utf8=%E2%9C%93&q=queryRenderedFeatures&type=

https://github.com/mapbox/mapbox-android-demo/blob/master/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/examples/styles/BasicSymbolLayerActivity.java

https://docs.mapbox.com/android/maps/examples/count-features-in-a-selected-area/

Answer 2

you should calculate the distance between the user position and store position , you can do this using this method :

private static double distance(double lat1, double lon1, double lat2, double lon2, String unit) {
    if ((lat1 == lat2) && (lon1 == lon2)) {
        return 0;
    }
    else {
        double theta = lon1 - lon2;
        double dist = Math.sin(Math.toRadians(lat1)) * Math.sin(Math.toRadians(lat2)) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.cos(Math.toRadians(theta));
        dist = Math.acos(dist);
        dist = Math.toDegrees(dist);
        dist = dist * 60 * 1.1515;
        if (unit == "K") {
            dist = dist * 1.609344;
        } else if (unit == "N") {
            dist = dist * 0.8684;
        }
        return (dist);
    }
}