显示用户位置附近的位置

Question

我正在开发一个应用，并且正在尝试使用android mapbox SDK实现一种列出靠近用户当前位置的商店的方法。谁能帮我该怎么实现？

Answer 1

您可以使用the Mapbox Tilequery API在Mapbox Streets样式的POI标签层中查询Point。过滤商店而不是咖啡馆，沙龙等的结果。使用LocationComponent的{​​{1}}作为查询坐标。

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

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

如果您想收听设备位置更改：https://docs.mapbox.com/help/tutorials/android-location-listening/

或者您可以在特定图层上查询渲染的getLastKnownLocation：

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

您应该计算用户位置和商店位置之间的距离，可以使用以下方法进行操作：

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);
    }
}