public ArrayList<Double> getPoints (){
    ArrayList<Double> location = new ArrayList<>();
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery("select latitude,longitude from "+Table_Name_Location,null);
    if(cursor.getCount() > 0){
        while (cursor.moveToNext()) {
            Double latitude = cursor.getDouble(cursor.getColumnIndex("Lat"));
            Double longitude = cursor.getDouble(cursor.getColumnIndex("Longi"));
            location.add(latitude);
            location.add(longitude);
        }
    }
    cursor.close();
    return location;
}
private double distance(double lat1, double lon1, double lat2, double lon2) {
    double theta = lon1 - lon2;
    double dist = Math.sin(deg2rad(lat1))
    * Math.sin(deg2rad(lat2))
    + Math.cos(deg2rad(lat1))
    * Math.cos(deg2rad(lat2))
    * Math.cos(deg2rad(theta));
    dist = Math.acos(dist);
    dist = rad2deg(dist);
    dist = dist * 60 * 1.1515;
    return (dist);
}
private double deg2rad(double deg) {
    return (deg * Math.PI / 180.0);
}
private double rad2deg(double rad) {
    return
}