ClassCastException while casting JSONArray into JSONObject

Question

Here is my code snippet:

    jArray = jChild.getJSONArray("users");
                    for (int i = 0; i < jArray.length(); i++) {
                        JSONObject jObject = (JSONObject) jArray.get(i);    //Exception thrown in this line

}

Edit:

Logcat:

09-30 09:06:23.404: E/AndroidRuntime(4011): java.lang.RuntimeException: An error occured while executing doInBackground()
09-30 09:06:23.404: E/AndroidRuntime(4011):     at android.os.AsyncTask$3.done(AsyncTask.java:200)
09-30 09:06:23.404: E/AndroidRuntime(4011): Caused by: java.lang.ClassCastException: java.lang.String
09-30 09:06:23.404: E/AndroidRuntime(4011):     at com.example.DbAccess.loadMonthView(DbAccess.java:196)

This is my jsonArray:

 [{"uid":"6","status":"absent","name":"xyz"},{"uid":"7","status":"absent","name":"abc Paul"}]

I want to retrieve JSONObject from JSONArray.

I hope this is not your full JSON, is it? Because there is no 'key' as 'users' to execute getJSONArray("users"). — Nizam
– Nizam, Commented Sep 30, 2013 at 4:07

Raghunandan · Accepted Answer · 2013-09-30 03:57:08Z

2

[ // represents json array node
    {     // represents json obeject node  
        "uid": "6",
        "status": "absent",
        "name": "xyz"
    },
    {
        "uid": "7",
        "status": "absent",
        "name": "abc Paul"
    }
]

What you have is a JSONArray. You need to parse the values and get the string.

     JSONArray jr = new JSONArray("myjsonstring");
     for(int i=0;i<jr.length();j++)
     {
     JSONOBject jb = jr.getJSONObject(i);
     String uid = jb.getString("uid");
     String status = jb.getString("status");
     String name = jb.getString("name");  
     }

answered Sep 30, 2013 at 3:57

Raghunandan

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1 Comment

Raghunandan Over a year ago

@user2749218 you also had this JSONObject jObject = (JSONObject) jArray.get(i); so the problem should be probably here jArray = jChild.getJSONArray("users"). Glad it helped

Angela-Dominguez · Accepted Answer · 2013-09-30 03:49:02Z

0

Your Json file has an array at the top level. When the JSonParser parses it, it's returning it as a JSONArray. You're trying to cast it to a JSONObject instead (which is like a map, or dictionary.) What you need to do is this:

Object obj;
try {

    obj = parser.parse(sCurrentLine);
    JSONArray jsonArray = (JSONArray) obj;
    for(obj : jsonArray){//not sure of the exact syntax, I don't have an IDE in front of me.
        JSONObject jsonObject = (JSONObject)obj;
        JSONObject realTitle = (JSONObject)jsonObject.get("0");
        String name = (String) realTitle.get("title");
    }


} catch (ParseException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

answered Sep 30, 2013 at 3:49

Angela-Dominguez

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