android mapview - 附加到类似 "onZoom"的东西

Question

我想为每个缩放级别更新我在 map View 上绘制的多边形。当 mapview 放大或缩小时，我如何获得通知？

BR

Answer 1

遗憾的是，没有通知您缩放级别更改的 native 回调。您可以做的 - 扩展 native map View 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);
    }
}