Android的图形页面自动-setting变焦，直到所有ItemizedOverlay的可见 [英] Android MapView -setting zoom automatically until all ItemizedOverlay's are visible

问题描述

硬编码setZoom（）内的onCreate（）感觉非常陈旧，我想由最初具有的MapView设置缩放，直到所有GeoPoints / OverlayItems都显示在地图上，以提升用户体验。

hard-coding the setZoom() within onCreate() feels very antiquated and I'd like to enhance the user experience by initially having the MapView set the zoom until all GeoPoints / OverlayItems are visible on the map.

如何才能做到这一点自动神奇？

How can this be done auto-magically?

推荐答案

有点像这样

int minLat = Integer.MAX_VALUE;
int maxLat = Integer.MIN_VALUE;
int minLon = Integer.MAX_VALUE;
int maxLon = Integer.MIN_VALUE;

for (GeoPoint item : items) 
{ 

      int lat = item.getLatitudeE6();
      int lon = item.getLongitudeE6();

      maxLat = Math.max(lat, maxLat);
      minLat = Math.min(lat, minLat);
      maxLon = Math.max(lon, maxLon);
      minLon = Math.min(lon, minLon);
 }

mapController.zoomToSpan(Math.abs(maxLat - minLat), Math.abs(maxLon - minLon));
mapController.animateTo(new GeoPoint( (maxLat + minLat)/2, 
(maxLon + minLon)/2 )); 

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编辑：瑞恩给了一个很好的建议：把一个填充，这样一些点不撒谎的边缘（！感谢瑞安）

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edit: Ryan gave a nice suggestion : to put a padding so that some of the point don't lie on the edges (thanks Ryan!)

double fitFactor = 1.5;
mapController.zoomToSpan((int) (Math.abs(maxLat - minLat) * fitFactor), (int)(Math.abs(maxLon - minLon) * fitFactor));

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