Android Studio: How to parse a JSON Object from Inside of a JSON Array?

Question

I am trying to parse the following JSON data into a recycler view. In particular, I want to parse the address object to display the locationName, line1, city, state and zip, but I cant get the parsing method right.

   {
 "pollingLocations": [
  {
   "address": {
    "locationName": "LITTLE LEAGUE HEADQUARTERS",
    "line1": "6707 LITTLE LEAGUE DR",
    "city": "SAN BERNARDINO",
    "state": "CA",
    "zip": "92407"
   },
   "notes": "",
   "pollingHours": "07:00-20:00",
   "sources": [
    {
     "name": "Voting Information Project",
     "official": true
    }
   ]
  }
 ]
}

My issue is finding the address object. With the current code, I get a logcat error that says No value for locationName. I think this is because I first need to specify the address object to iterate through, but how do I do this? This is the current implementation that I have right now.

//fetch
private void getData() {
    final ProgressDialog progressDialog = new ProgressDialog(this);
    progressDialog.setMessage("Loading...");
    progressDialog.show();

    StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            progressDialog.dismiss();
            try {
                JSONObject jsonObject = new JSONObject(response);
                JSONArray array = jsonObject.getJSONArray("pollingLocations");
                for(int i = 0; i < array.length(); i++){
                    JSONObject addressObject = array.getJSONObject(i);
                    for (int x = 0; x < addressObject.length(); x++){
                        VotingLoc votingLoc = new VotingLoc(addressObject.getString("locationName"),
                                addressObject.getString("line1"),
                                addressObject.getString("city"),
                                addressObject.getString("state"),
                                addressObject.getString("zip"),
                                addressObject.getString("pollingHours"));
                        votingList.add(votingLoc);
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e("Volley", error.toString());
            progressDialog.dismiss();
        }
    });
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}

Locat Error:

Is there an easier way of doing this? I believe the code for my rvadapter class and is correct and the error is in this method, but If you want to see any other code, let me know.

Thats what I was thinking, but when I create a jsonObject for address the logcat error then says no value for address. Can you bhe a little more specific on how you would implement this? — Gabriel
– Gabriel, Commented Jan 7, 2019 at 19:17
Do i need a nested for loop in the scenario? How can I do it without one? — Gabriel
– Gabriel, Commented Jan 7, 2019 at 19:29

Yupi · Accepted Answer · 2019-01-07 20:23:03Z

1

By getting first node in array you have obtained address node so no need to run loop there, address object is not an array you can get values directly. Try something like this:

        JSONArray array = object.getJSONArray("pollingLocations");
        for (int i = 0; i < array.length(); i++) {
            JSONObject jsonObject = array.getJSONObject(i);
           String locationName = jsonObject.getJSONObject("address")
                   .getString("locationName");
           Log.d("locationName", locationName);
            JSONArray sourcesArray = jsonObject.getJSONArray("sources");

          // run loop to get values from this array
          for (int j = 0; j < sourcesArray.length(); j++){
                JSONObject source = sourcesArray.getJSONObject(j);
                String name = source.getString("name");
            }
        }

edited Jan 7, 2019 at 20:23

answered Jan 7, 2019 at 19:29

Yupi

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2 Comments

Gabriel Over a year ago

This was the first solution I had in mind, but whenever I try to create the JSONObject and pass "address" as a parameter I get a syntax error. I can only pass an integer as an index of the array and not a string.

Gabriel Over a year ago

I can pass index i from the for loop but it wont let me pass a string

fenceking · Accepted Answer · 2019-01-07 21:08:40Z

1

Another way could be using a json parser like gson (https://github.com/google/gson) or jackson (https://github.com/FasterXML/jackson). This may be a bit overhead if your only goal is to show these few values, as you must create some java classes, you may only need for parsing.

answered Jan 7, 2019 at 21:08

fenceking

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