Question

I have one ASP.NET Webservice that i calling from my Android app and getting out a string with this JSON data:

{
    "d": [{
        "__type": "Trafikverket_API.Models.Trafiklage",
        "TagGrupp": "44be2cce-3055-4d22-aaf2-00e098b0422e",
        "Fran": "Gävle,Uppsala,Stockholm",
        "Till": "Norrköping,Linköping",
        "TrafikplatsNamn": "Nyköping C",
        "VisaAnkomst": "true",
        "InstalldAnkomst": "false",
        "InstalldAvgang": "false",
        "SparangivelseAvgang": "6",
        "AnmarkningarAvgang": "SJ Regional",
        "AnnonseratTagId": "249",
        "SparangivelseAnkomst": "6",
        "AnmarkningarAnkomst": "SJ Regional",
        "AnnonseradAnkomstTid": "21:50",
        "AnnonseradAvgangTid": "21:53",
        "BeraknadAvgangTid": null,
        "BeraknadAnkomstTid": null,
        "AnnonseradTidpunktAvgang": "2011-10-23T21:53:00+02:00"
    }, {
        "__type": "Trafikverket_API.Models.Trafiklage",
        "TagGrupp": "eae407a9-61ba-43f4-9c53-c666c2a3f117",
        "Fran": "Stockholm,Södertälje",
        "Till": "Norrköping,Linköping",
        "TrafikplatsNamn": "Nyköping C",
        "VisaAnkomst": "true",
        "InstalldAnkomst": "false",
        "InstalldAvgang": "false",
        "SparangivelseAvgang": "6",
        "AnmarkningarAvgang": "SJ Regional",
        "AnnonseratTagId": "251",
        "SparangivelseAnkomst": "6",
        "AnmarkningarAnkomst": "SJ Regional",
        "AnnonseradAnkomstTid": "22:52",
        "AnnonseradAvgangTid": "22:54",
        "BeraknadAvgangTid": null,
        "BeraknadAnkomstTid": null,
        "AnnonseradTidpunktAvgang": "2011-10-23T22:54:00+02:00"
    }, ..... ]
}

I have a object called StationInfo that looks like this:

public class DataModel 
{
    public Boolean VisaAnkomst;
    public String TagGrupp;
    public String Fran;
    public String Till;
    public String TrafikplatsNamn;
    public Boolean InstalldAnkomst;
    public Boolean InstalldAvgang;
    public String SparangivelseAvgang;
    public String AnmarkningarAvgang;
    public Integer AnnonseratTagId;
    public String SparangivelseAnkomst;
    public String AnmarkningarAnkomst;
    public String AnnonseradAnkomstTid;
    public String AnnonseradAvgangTid;
    public String BeraknadTidpunktAnkomst;
    public String BeraknadTidpunktAvgang;
    public String VerkligAnkomstTid;
    public String VerkligAvgangTid;
    public String BeraknadAvgangTid;
    public String BeraknadAnkomstTid;
    public String AnnonseradTidpunktAvgang;
    public String VerkligTidpunktAnkomst;
}

When i running this:

Gson gson = new Gson();
DataModel[] stationInfos = gson.fromJson(result, DataModel[].class);

I getting this exception:

com.google.gson.JsonParseException: Expecting object but found array

I ges i need some object that match the object “d” but how do i do that?

Answer 1

Instead of using Gson, i would suggest you to implement the in-built JSON classes:

JSONObject obj;
try {
    obj = new JSONObject("yourJsonData");
    JSONArray objD = obj.getJSONArray("d");  // getting your "d" array from json data           
    JSONObject subObject;

    for(int i=0; i<objD.length(); i++)
    {
        subObject = objD.getJSONObject(i); // getting one by one objects from Array
    }
} catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}