how to parse a json with android

Question

Hello all i have a problem with a special json formatted with an array of array and object.

{
  "contrat":  [
    {
      "id":0,
      "email":"RAJita@YAHOO.COM",
      "mobile":"55281055",
      "fixe":"33740970",
      "numContrat":"252010176",
      "offre":"bb : Automobile",
      "dateDebut":"2013-01-03",
      "dateFin":"2014-01-03",
      "statut":"En cours"
    },
    [ ],
    [ ]
  ],
  "success":1,
  "code":200
}

Normally if I had a normal json with an array of object, I used this method:

JSONArray contratObj = json.getJSONArray("contrat"); // JSONArray
for (int i = 0; i < contratObj.length(); i++) {
    // get first contrat object from JSON Array
    JSONObject contrat = contratObj.getJSONObject(i);               

    contratlist.add(new contratitem(contrat.getInt("id"),
    contrat.getString("numContrat"), contrat.getString("offre"), 
    contrat.getString("dateDebut"), contrat.getString("dateFin"), 
    contrat.getString("statut")));
}

but the array "contrat" contains empty array and object

How can I change my code to ignore empty array ?

score 0 · Answer 1 · answered Nov 24 '15 at 14:08

You can use it like this:

JSONObject contrat = contratObj.getJSONObject(i);
if(contrat.length!=0) {
contratlist.add(new contratitem(contrat.getInt("id"),
contrat.getString("numContrat"), contrat.getString("offre"), 
contrat.getString("dateDebut"), contrat.getString("dateFin"), 
contrat.getString("statut")));
}

score 0 · Answer 2 · answered Nov 24 '15 at 14:11

first validate your JSON here: http://jsonlint.com/

Than, I would use http://www.jsonschema2pojo.org/ . mind to select gson as a parser and json as real data, instad of schema, because you copying a real JSON data. You can download you class as JAR or copy the source. After it you can parse the JSON with GSON and load into classes.

Retrofit is a good way to do it. It's a very simple downloading library.

Any further questions, please add as comment. Take care

my problem is not to create this json but to read this json and add him in arraylist — slama007, Nov 24 '15 at 14:25

score 0 · Answer 3 · answered Nov 24 '15 at 14:40

Try like this, it should work.

JSONArray contratObj = json.optJSONArray("contrat"); // JSONArray
        if (contratObj != null) {
          for (int i = 0; i < contratObj.length(); i++) {
            // get first contrat object from JSON Array
            JSONObject contrat = contratObj.optJSONObject(i);

            if (contrat != null) {
              contratlist.add(new contratitem(contrat.getInt("id"), contrat.optString("numContrat"),
                  contrat.getString("offre"), contrat.optString("dateDebut"),
                  contrat.getString("dateFin"), contrat.optString("statut")));
            }
          }
        }

read above Document

Suhas · Answer 4 · 2015-11-24T15:26:01.633

With the current code and json that you have, the App would crash with JSONException as it won't be able to execute JSONObject contrat = contratObj.getJSONObject(i); for the 2nd element as it is an array. So, you need to check whether the element is a JSONArray or JSONObject before that. Modifying your code as below will help you achieve that and to ignore JSONArrays.

JSONArray contratObj = json.getJSONArray("contrat");
for (int i = 0; i < contratObj.length(); i++) {
    if (contratObj.get(i) instanceof JSONObject) {
        JSONObject contrat = contratObj.getJSONObject(i);
        contratlist.add(new contratitem(contrat.getInt("id"),
        contrat.getString("numContrat"), contrat.getString("offre"), 
        contrat.getString("dateDebut"), contrat.getString("dateFin"), 
        contrat.getString("statut")));
    }
}

Let me know if this helps !

how to parse a json with android

4 Answers4