Question

我知道如何按级别缩放谷歌地图但我想要的是在谷歌地图上显示一个特定的区域

我的意思是我只想显示Lat = 24.453＆amp;的区域。长= 35.547＆amp;半径= 200km

如何实现？

Answer 1

 CameraUpdate center=
    CameraUpdateFactory.newLatLng(new LatLng( 24.453,
                                             35.547));
CameraUpdate zoom=CameraUpdateFactory.zoomTo(15);

map.moveCamera(center);
map.animateCamera(zoom);

使用此功能，希望这对您有所帮助。

StringBuilder sb = new StringBuilder(
                "https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
        sb.append("location=" + mLatitude + "," + mLongitude);
        sb.append("&radius=" + radius);
        sb.append("&types=" + type);
        sb.append("&sensor=true");
        sb.append("&key=YOUR_API_KEY");

使用此api服务使用radius

Answer 2

感谢@Ken和How does this Google Maps zoom level calculation work?，我找到了解决方案。

private fun getZoomLevel(radius: Double): Float {
    return if (radius > 0) {
        // val scale = radius / 300 // This constant depends on screen size.
        // Calculate scale depending on screen dpi.
        val scale = radius * resources.displayMetrics.densityDpi / 100000
        (16 - Math.log(scale) / Math.log(2.0)).toFloat()
    } else 16f
}

我不知道它如何取决于屏幕尺寸（dpi，宽度，高度），所以这是另一个变体：

private fun getZoomLevel(radius: Double): Float {
    return if (radius > 0) {
        val metrics = resources.displayMetrics
        val size = if (metrics.widthPixels < metrics.heightPixels) metrics.widthPixels
        else metrics.heightPixels
        val scale = radius * size / 300000
        (16 - Math.log(scale) / Math.log(2.0)).toFloat()
    } else 16f
}

用法：

private fun zoomMapToRadius(latitude: Double, longitude: Double, radius: Double) {
    val position = LatLng(latitude, longitude)
    val center = CameraUpdateFactory.newLatLngZoom(position, getZoomLevel(radius))
    googleMap?.animateCamera(center)
}

或

private fun zoomMapToRadius(/*latitude: Double, longitude: Double,*/ radius: Double) {
    //val position = LatLng(latitude, longitude)
    //val center = CameraUpdateFactory.newLatLng(position)
    //googleMap?.moveCamera(center)
    val zoom = CameraUpdateFactory.zoomTo(getZoomLevel(radius))
    googleMap?.animateCamera(zoom)
}

android谷歌地图通过lat和long缩放到特定区域

2 个答案: