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

Just wondering what that error could mean? I get it from the following code..

 try{
    JSONArray jArray = new JSONArray(result);
    for(int开发者_如何学Go i=0;i<jArray.length();i++){
            JSONObject json_data = jArray.getJSONObject(i);
            Log.i("log_tag","id: "+json_data.getInt("id")+
                    ", name: "+json_data.getString("name")+
                    ", sex: "+json_data.getInt("sex")+
                    ", birthyear: "+json_data.getInt("birthyear")
            );
    }
}
}catch(JSONException e){
    Log.e("log_tag", "Error parsing data "+e.toString());
}

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Result is null, apparently. Or it simply does not start with [. Print it out before calling JSONArray to see.

Also take a look at the JSONArray source. It is expecting JavaScript array syntax, e.g.:

['this', 'is', 'array', 'syntax']

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text.trim(); text.trim();

Text is the json file or string , do this at least two times one after another will resolve the problem 99.9%.