Android MapView动态设置缩放级别

Question

请问我有问题， 如何设置依赖于当前速度的缩放级别？ 例如，当移动缓慢。放大到近处，快速时放大到远处。

这里是我的算法：

private int calculateZoomLevelBySpeed(float speed) { 
    int zoomLevelMax = mapView.getMaxZoomLevel(); 
    // default 
    int zoomLevel = (zoomLevelMax > 0) ? (int)zoomLevelMax/2 : 4; 

    if (speed > 0) { 
     // 300km theoretically max/max zoom steps 
     double step = 300/zoomLevelMax; 
     zoomLevel = (int) Math.round(speed/step); 
     // reverse 
     zoomLevel = zoomLevelMax - zoomLevel; 
     zoomLevel = Math.min(zoomLevelMax, zoomLevelMax); 
     zoomLevel = Math.max(zoomLevelMax, 1); 
    } 
    return zoomLevel; 
} 

这不起作用，我该怎么办呢？

在此先感谢。

Answer 1

试试这个，我真的没有测试它，但我希望它能帮助

private int calculateZoomLevelBySpeed(float speed) 
{ 
    //assuming this line returns the max zoom level on maps 
    int zoomLevelMax = mapView.getMaxZoomLevel(); 
    // default 
    int zoomLevel = (zoomLevelMax > 0) ? (int)zoomLevelMax/2 : 4; 

    if (speed > 0) { 
     // 300km theoretically max/max zoom steps 
     double step = (speed/300) * zoomLevelMax; 
    } 
    return Math.Round(zoomLevel); 
} 

Answer 2

试试这样说：

private int calculateZoomLevelBySpeed(float speed) { 
    int zoomLevelMax = mapView.getMaxZoomLevel(); 

    if (speed > 0) { 
     // 300km theoretically max/max zoom steps 
     double step = 300/zoomLevelMax; 
     zoomLevel = (int) Math.round(speed/step); 
     // reverse 
     zoomLevel = zoomLevelMax - zoomLevel; 
    } 
    return zoomLevel; 
}