Question

I’m reading a JSON file in my android project, just to see the first position of the array.

In fact, if this JSON is more big what normal, I think this isn’t efficient…

My json file reader:

public static JSONObject parseJSONfromInputStrem (InputStreamReader isr){
    try {
        BufferedReader reader = new BufferedReader(isr,8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }

        isr.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;
} 

Where I call the function:

 FileInputStream fis = c.openFileInput(file);
 InputStreamReader isr = new InputStreamReader(fis);
 JSONObject jso = JSONParser.parseJSONfromInputStrem(isr);
 JSONArray myArray = jso.getJSONArray("data");

There are any way to read, efficiently, the first position of a JSONArray?

Answer 1

You should use a streaming JSON parser (think DOM vs SAX).

https://stackoverflow.com/a/823632/18573 lists some. There may be others.