nala4ever nala4ever - 3 months ago 14
Java Question

Reading a Json Array in android

I'm trying to read a JSON array. Here is my code.

JSONArray jArray = new JSONArray(jsonString);

System.out.println("*****JARRAY*****"+jArray.length());
for(int i=0;i<jArray.length();i++){


JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","_id"+json_data.getInt("account")+
", mall_name"+json_data.getString("name")+
", location"+json_data.getString("number")+
", telephone"+json_data.getString("url")+
",----"+json_data.getString("balance")+
",----"+json_data.getString("credit")+
",----"+json_data.getString("displayName")
);

}


And my sample JSON files syntax is as follows,

{
"list": [
{
"account": 1,
"name": "card",
"number": "xxxxx xxxx xxxx 2002",
"url": "http://www.google.com",
"balance": 1.0,
"credit": 1.0,
"displayName": "hsbc bank"
},
{
"account": 2,
"name": "card2",
"number": "xxxxx xxxx xxxx 3003",
"url": "http://www.google.com",
"balance": 2.0,
"credit": 2.0,
"displayName": "nsb bank"
}
],
"count": 2
}


It has a curly brace in front. When i try to execute this code block it gives an error saying


A JSONArray text must start with '['
at character 1 of....


Has anyone encountered a problem like this? Any help would be greatly appreciated.
Please show me a sample code block if can.
Thanks in advance.

Answer

A JSON Object starts with a { and ends with a } while a JSON Array starts with a [ and ends with a ].

In your case, change your code to have a JSONObject instead.

JSONObject json = new JSONObject(jsonString);
JSONArray jArray = json.getJSONArray("list");

System.out.println("*****JARRAY*****" + jArray.length());

for(int i=0; i<jArray.length(); i++){
    JSONObject json_data = jArray.getJSONObject(i);

    Log.i("log_tag", "_id" + json_data.getInt("account") +
        ", mall_name" + json_data.getString("name") +
        ", location" + json_data.getString("number") +
        ", telephone" + json_data.getString("url") +
        ",----" + json_data.getString("balance") +
        ",----" + json_data.getString("credit") +
        ",----" + json_data.getString("displayName")
    );
}