Question

我希望以英里为单位设置Google地图的缩放级别，现在，我正在使用此代码，但我认为这是错误的，需要改进。

map.animateCamera(CameraUpdateFactory.newLatLngZoom(MYLOC, calculateZoomLevel()));

   public byte calculateZoomLevel() {    
    byte zoom = 1;
    // if distance is in KMs
    double E = 40075;
    // if distance is in Miles
    //double E = 21638;
    zoom = (byte) Math.round(Math.log(E / nearByRadius) / Math.log(2) + 1);
    // to avoid exeptions
    if (zoom > 21) {
        zoom = 21;
    }
    if (zoom < 1) {
        zoom = 1;
    }
    Log.v(TAG, "zoom level = " + zoom);
    return zoom;
}

Answer 1

我有类似的任务，我需要显示中心和N km半径的地图。这是我的解决方案

 private CameraUpdate getZoomForDistance(LatLng originalPosition,double distance){
    LatLng rightBottom = SphericalUtil.computeOffset(originalPosition,distance,135);
    LatLng leftTop = SphericalUtil.computeOffset(originalPosition,distance,-45);
    LatLngBounds sBounds = new LatLngBounds(new LatLng(rightBottom.latitude,leftTop.longitude),new LatLng(leftTop.latitude,rightBottom.longitude));
    return CameraUpdateFactory.newLatLngBounds(sBounds,0);

}

它使用此库android-maps-utils 希望这会对你有所帮助

Answer 2

基于@alexandr响应

fun newLatLngOffset(center: LatLng, dist: Int): CameraUpdate {
    return CameraUpdateFactory.newLatLngBounds(
        LatLngBounds.Builder()
            .include(SphericalUtil.computeOffset(center, dist.toDouble(), 0.0))
            .include(SphericalUtil.computeOffset(center, dist.toDouble(), 90.0))
            .include(SphericalUtil.computeOffset(center, dist.toDouble(), 180.0))
            .include(SphericalUtil.computeOffset(center, dist.toDouble(), 270.0))
            .build(), 0
    )
}

主要区别是与他的解决方案圈子是外切的，在我的题词上是

Android Google Maps v2以英里为单位设置缩放级别

2 个答案: