CODEWITHSUNDEEP
androidjsonandroid-volley
nuhkoca
nuhkoca

Reputation: 1943

How can I reach to the image node

I have a JSON structure like below and I cannot reach to the image node in no way. How can I do that with Volley library? Any ideas will be helpful. Thanks in advance.

{
  "nodes": [
    {
      "node": {
        "id": "2536",
        "title": "Die Düsseldorfer Rabbiner",
        "image": {
          "src": "how to reach here",
          "alt": "",
          "title": "© Landeshauptstadt Düsseldorf/Michael Gstettenbauer"
        },
        "body": "some text",
        "category": "Deutsch",
        "created": "1481344134",
        "url": "some text"
      }
    }
  ]
}

Code Block

JsonArrayRequest getRequest = new JsonArrayRequest(
            url,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    try {
                        JSONObject jsonObject = new JSONObject("response");
                        JSONArray jsonArray = jsonObject.getJSONArray("nodes");
                        for(int i = 0; i<jsonArray.length(); i++){
                            JSONObject jo = jsonArray .getJSONObject(i);
                            String name = jo.getString("category");

                            Toast.makeText(context, name, Toast.LENGTH_LONG).show();

                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

Upvotes: 0

Views: 43

Answers (2)

pipeur10
pipeur10

Reputation: 73

From the look of things you should  use JsonObjectRequest instead  JsonArrayRequest.

 JsonObjectRequest request=new JsonObjectRequest(url, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {

                    try {
                        JSONArray  array = response.getJSONArray("nodes");
                        for(int i=0;i<array.length();i++){
                            JSONObject object= array.getJSONObject(i);
                            JSONObject imageObject= object.getJSONObject("node").getJSONObject("image");
                            Toast.makeText(TestActivity.this, imageObject.toString(), Toast.LENGTH_LONG).show();
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                }
            });

Upvotes: 1

Bryan
Bryan

Reputation: 15155

Your Java model should match the JSON exactly. The base element in your JSON schema is an object, not an array; therefore your request should be a JSONObjectRequest, not a JSONArrayRequest:

JSONObjectRequest request = new JSONObjectRequest(url,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONArray response) {
                    try {
                        JSONArray nodes = response.getJSONArray("nodes");
                        for(int i = 0; i < nodes.length; i++) {
                            JSONObject obj = nodes.getJSONObject(i);
                            JSONObject node = obj.getJSONObject("node");
                            JSONObject image = node.getJSONObject("image");
                            String title = image.getString("title");

                            Toast.makeText(context, title, Toast.LENGTH_LONG).show();
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            });

As you might be able to see, this can get tedious if you have a large dataset. Which is why I highly recommend using a JSON parsing library; such as GSON, Moshi or Jackson. There is a good tutorial on how to make a custom request with Volley to make use of these libraries in the training documentation.

Upvotes: 1

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