左上角; Android SDK中MapView的右下经度和纬度值

Question

我正在实施基于地图的Android应用程序。我试图在TopLeft和Bottom右侧显示引脚。以下是我尝试过的代码。但我无法显示它。你能否建议一种方法让这些人坐下来。

public GeoPoint topLeft(GeoPoint mapCenter, int latspan, int langspan) {
 int lat = (mapCenter.getLatitudeE6()) + (latspan/2);
 int lang = (mapCenter.getLongitudeE6()) - (langspan/2);
 return new GeoPoint(lat, lang);
}

public GeoPoint bottomRight(GeoPoint mapCenter, int latspan, int langspan) {
 int lat = (mapCenter.getLatitudeE6()) - (latspan/2);
 int lang = (mapCenter.getLongitudeE6()) + (langspan/2);
 return new GeoPoint(lat, lang);
}

Answer 1

你在找这样的东西吗？

Projection proj = mapView.getProjection();
GeoPoint topLeft = proj.fromPixels(0, 0);

GeoPoint bottomRight = proj.fromPixels(mapView.getWidth()-1, mapView.getHeight()-1);

double topLat = topLeft.getLatitudeE6()/1E6;
double topLon = topLeft.getLongitudeE6()/1E6;
double bottomLat = bottomRight.getLatitudeE6()/1E6;
double bottomLon = bottomRight.getLongitudeE6()/1E6;

希望它有所帮助！