围绕一组标记中心和缩放Android MapView？

Question

我有一个mapView,其中几个点用标记绘制,每个标记具有不同的纬度和经度,可能在附近可能相邻也可能不相近.有没有办法让MapView打开到最深的缩放级别,将屏幕上的所有点集中在一起？

我知道mapController有一个setZoom和setCenter属性,但是如何确定这些方法的值呢？或者还有另一种更简单的方法来实现这一目标吗？

Answer 1

在MapView中,在ImtemizedOverlay中添加了overlayItem后,如下所示:

GeoPoint aGeoPoint = new GeoPoint((int)(latitude * 1E6), (int)(longitude * 1E6));
OverlayItem aOverlayItem = new OverlayItem(aGeoPoint, "Auto", "Auto");
locationsItemizedOverlay.addOverlay(aOverlayItem);

试试这个:

    // Center map in geopoints
    GeoPoint point = locationsItemizedOverlay.getCenterPoint();

    int latSpan = locationsItemizedOverlay.getLatSpanE6();
    int longSpan = locationsItemizedOverlay.getLonSpanE6();

    mapView.getController().setCenter(point);
    mapView.getController().zoomToSpan((int)(latSpan * Constants.MAP_ZOOM_FACTOR), (int)(longSpan * Constants.MAP_ZOOM_FACTOR));

在您的重写ItemizedOverlay中:

public GeoPoint getCenterPoint() {
    if(center == null) {
        int northEdge = -90000000; // i.e., -90E6 microdegrees
        int southEdge = 90000000;
        int eastEdge = -180000000;
        int westEdge = 180000000;

        Iterator<OverlayItem> iterator = overlayItemsArrayList.iterator();
        while(iterator.hasNext()) {
            GeoPoint geoPoint = iterator.next().getPoint();

            if(geoPoint.getLatitudeE6() > northEdge)
                northEdge = geoPoint.getLatitudeE6();

            if(geoPoint.getLatitudeE6() < southEdge)
                southEdge = geoPoint.getLatitudeE6();

            if(geoPoint.getLongitudeE6() > eastEdge)
                eastEdge = geoPoint.getLongitudeE6();

            if(geoPoint.getLongitudeE6() < westEdge)
                westEdge = geoPoint.getLongitudeE6();
        }

        center = new GeoPoint((int)((northEdge + southEdge) / 2), (int)((westEdge + eastEdge) / 2));
    }

    return center;
}

我希望它有所帮助.