JSON-Simple java.lang.String cannot be cast to java.lang.Number

Question

I'm trying to get the LAT/LNG values from my json(as Double) seen here:

{
    "placeNames": [
        {
            "name": "Test",
            "lat": "0",
            "lon": "0"
        },
        {
            "name": "Üsküdar Bağlarbaşı Yolu",
            "lat": "1",
            "lon": "2"
        },
        {
            "name": "Çamlıca",
            "lat": "3",
            "lon": "4"
        }
    ]
}

And put markers on location in google maps seen here:

JSONParser jsonParser = new JSONParser();

try {
    JSONObject jsonObject = (JSONObject) jsonParser.parse(GetJson(getContext())); //TODO: READ JSON FILE
    JSONArray lang = (JSONArray) jsonObject.get("placeNames");
    for (int i = 0; i < lang.size(); i++) {
        JSONObject explrObject = (JSONObject) lang.get(i);
        String PlaceName = (String) explrObject.get("name");
        MarkerOptions marker3 = new MarkerOptions();
        Double LAT = ((Number) explrObject.get("lat")).doubleValue();
        Double LNG = ((Number) explrObject.get("lon")).doubleValue();
        marker3.position(new LatLng(LAT, LNG)).title(PlaceName);
    }
}

The problem im getting is the fact that LNG/LAT values seem to be coming in as string even though theyre numbers on my JSON file,Any help is appreciated.:)

Nahuel Giani · Accepted Answer · 2021-12-20 18:14:44Z

2

Maybe you can try:

Double LAT = Double.parseDouble(explrObject.getString("lat"));

or

Double LAT = Double.parseDouble((String) explrObject.get("lat"));

edited Dec 20, 2021 at 18:14

answered Dec 20, 2021 at 17:55

Nahuel Giani

5701 gold badge8 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

muzmuz213 Over a year ago

I'm using JSON-Simple so it doesnt have functioıns like getString

Nahuel Giani Over a year ago

Sorry, my bad. If you try: Double LAT = Double.parseDouble((String) explrObject.get("lat")); ?

Bipin Kumar Chaurasia · Accepted Answer · 2021-12-20 18:17:29Z

1

Following is a valid JSON syntax with double/ float values that you can use to construct your json as,

{
    "placeNames":[
        {
            "name":"Test",
            "lat":29.470237,
            "lon":107.722125
        }
    ]
}

also, you can refer to this website for validating your JSON syntax online in case of any doubts. And also, your above JSON parser logic will work on this JSON data.

answered Dec 20, 2021 at 18:17

Bipin Kumar Chaurasia

4283 silver badges13 bronze badges

Collectives™ on Stack Overflow

JSON-Simple java.lang.String cannot be cast to java.lang.Number

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related