ArcGIS for Android地图上实际距离与对应的屏幕像素值计算

/**
* 将实际地理距离转换为屏幕像素值
*
* @param distance
*            实际距离,单位为米
* @param currScale
*            当前地图尺寸
* @param context
* @return
*/
public static double metreToScreenPixel(double distance, double currScale,
Context context) {
float dpi = context.getResources().getDisplayMetrics().densityDpi;
// 当前地图范围内1像素代表多少地图单位的实际距离
double resolution = (25.39999918 / dpi)
* currScale / 1000;
return distance / resolution;
}

/**
* 将屏幕上对应的像素距离转换为当前显示地图上的地理距离(米)
*
* @param pxlength
* @param currScale
* @param context
* @return
*/
public static double screenPixelToMetre(double pxlength, double currScale,
Context context) {
float dpi = context.getResources().getDisplayMetrics().densityDpi;
double resolution = (25.39999918 / dpi)
* currScale / 1000;
return pxlength * resolution;
}