android mapview - 附加到“onZoom”之类的东西

Question

我想更新我在mapview上为每个缩放级别绘制的多边形。当mapview放大或缩小时，我如何获得通知？

BR

Answer 1

不幸的是，没有本地回调可以通知您有关缩放级别更改的信息。您可以做的是 - 扩展本机地图视图并在onDraw方法中查找缩放级别更改：

public final class CustomMapView extends MapView
{
    private int lastZoomLevel = -1;


    @Override
    public void draw(Canvas canvas) 
    {
        if (isZoomChange()) 
        {
            lastZoomLevel = this.getZoomLevel();
            onZoomLevelChange(lastZoomLevel); //this would be your notification function
        }
        super.draw(canvas);
    }

    private boolean isZoomChange() 
    {
        return (getZoomLevel() != lastZoomLevel);
    }
}