Android MapView動態設置縮放級別

Question

請問我有問題， 如何設置依賴於當前速度的縮放級別？ 例如，當移動緩慢。放大到近處，快速時放大到遠處。

這裏是我的算法：

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; 
} 

這不起作用，我該怎麼辦呢？

在此先感謝。

Answer 1

試試這個，我真的沒有測試它，但我希望它能幫助

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

試試這樣說：

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; 
}