根据经纬度算距离

public double getDistance(double startLat,double startLong,double endLat,double endLong){    //startLong 起始坐标点经度　　 //startLat 起始坐标点维度　　 //endLong 目标坐标点经度　　 //endLat 目标坐标点维度
    double lat1 = (Math.PI/180)*startLat;
    double lat2 = (Math.PI/180)*endLat;

    double lon1 = (Math.PI/180)*startLong;
    double lon2 = (Math.PI/180)*endLong;
    //地球半径
    double R = 6371;

    //两点间距离 km，如果想要米的话，结果*1000就可以了
    double d =  Math.acos(Math.sin(lat1)*Math.sin(lat2)+Math.cos(lat1)*Math.cos(lat2)*Math.cos(lon2-lon1))*R;
    //double s=R*Math.acos(Math.cos(lat1*Math.PI/180 ) * Math.cos(lat2*Math.PI/180) * Math.cos(lng1*Math.PI/180 -lng2*Math.PI/180) + Math.sin(lat1*Math.PI/180 ) * Math.sin(lat2*Math.PI/180));
    return d*1000;}