Android地图使用Direction Api放置Api

Question

我在android中使用google places api，但我也想找到我当前位置与地图上显示的特定位置之间的距离，请帮助我找到它。因为我在从places api获取位置值后使用方向api时，会花费太多时间，而且不容易显示结果，请帮助我

Answer 1

尝试以下方法：

public double CalculationsByDistance(){

    // earth radius
    int Radius = 6371;

    // set your original and destination latitude longitude
    double lat1 = new_lat; 
    double lat2 = dest_lat;
    double lon1 = new_long;
    double lon2 = dest_long;

    double d_lat = Math.toRadians(lat2 - lat1);
    double d_lon = Math.toRadians(lon2 - lon1);
    double a = Math.sin(d_lat / 2) * Math.sin(d_lat / 2) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.sin(d_lon / 2) * Math.sin(d_lon / 2);
    double c = 2 * Math.asin(Math.sqrt(a));
    hasil = Radius * c;
    double kilo_meter = hasil / 1;
    DecimalFormat formatBaru = new DecimalFormat("####");
    int kilometer_dlm_desimal = Integer.valueOf(formatBaru.format(kilo_meter));
    e = new Integer(kilometer_dlm_desimal).toString();
    double meter = hasil * 1000;
    int meter_dlm_decimal = Integer.valueOf(formatBaru.format(meter));
    d = new Integer(meter_dlm_decimal).toString();
    Log.i("Radius ", "" + hasil + " KM " + kilometer_dlm_desimal + " Meter " + meter_dlm_decimal);

    return Radius * c;  
}

Answer 2

使用此方法可以计算两个位置之间的距离。这将返回以米为单位的近似距离。

请将源位置和目标位置传递给此方法。

private double calculateDistance(Location source, Location destination){
    double distance = 0;
    try {           


        distance = source.distanceTo(destination);
        return distance;
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return 0;
    }
}