如何放大一个MapView类，因此始终包括两个geopoints？ [英] How to zoom a MapView so it always includes two geopoints?

问题描述

我有两个地理点的变化间歇性，并且希望的MapView来调整和转换，以确保这两点始终可见。我可以很容易地重新中心在两者之间的点中途的地图，但是我怎么设置缩放级别，以确保我的两点是可见的？

I have two geo points that vary intermittently, and want the MapView to resize and translate to make sure both points are always visible. I can easily re-centre the map on the point mid-way between the two, but how do I set the zoom level to ensure my two points are visible?

推荐答案

试试这个，看看：

double latitudeSpan = Math.round(Math.abs(firstLat - 
                secLat));
double longitudeSpan = Math.round(Math.abs(firstLong - 
                secLong));

double currentLatitudeSpan = (double)mapView.getLatitudeSpan();
double currentLongitudeSpan = (double)mapView.getLongitudeSpan();

double ratio = currentLongitudeSpan/currentLatitudeSpan;
if(longitudeSpan < (double)(latitudeSpan+2E7) * ratio){
    longitudeSpan = ((double)(latitudeSpan+2E7) * ratio);
}

mapController.zoomToSpan((int)(latitudeSpan*2), (int)(longitudeSpan*2));                
mapView.invalidate();

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