Android Array with JSON results

Question

I would like to update a different thread that I made with some code that I have written that is not working. I am trying to parse my information, which after sending a post request, looks like this [{"fromUser":"Andrew"},{"fromUser":"Jimmy"}]

I would then like to take those users, and add them to a list view. Here is my code for sending the HTTPpost and then also my code for trying to parse and put it into the adapter.

 HttpClient httpClient = new DefaultHttpClient();

            HttpPost httpPost = new HttpPost(htmlUrl);

            List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
            nameValuePair.add(new BasicNameValuePair("Username", "Brock"));

            try {
                httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            try {
               HttpResponse response = httpClient.execute(httpPost);

                // writing response to log
                Log.d("Http Response:", response.toString());
            } catch (ClientProtocolException e) {
                // writing exception to log
                e.printStackTrace();
            } catch (IOException e) {
                // writing exception to log
                e.printStackTrace();
            }
            try {
                JSONObject pendingUsers = new JSONObject("$myArray");
            } catch (JSONException e) {
                e.printStackTrace();
            }

            // Read response to string
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"),8);
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                is.close();
                result = sb.toString();
            } catch(Exception e) {
                return null;
            }

            // Convert string to object
            try {
                jsonObject = new JSONObject(result);
            } catch(JSONException e) {
                return null;
            }
public void getJsonResult(JSONObject pendingRequests)
{
    pendingRequests = jsonObject;
}

Here is where I try to receive this and put it into my list

 HTTPSendPost postSender = new HTTPSendPost();
        postSender.Setup(500, 050, "tesT", htmlUrl);
        postSender.execute();

        JSONObject pendingRequests = new JSONObject();
         postSender.getJsonResult(pendingRequests);

        try {
            for(int i = 0; i < pendingRequests.length(); i++) {
                JSONArray fromUser = pendingRequests.getJSONArray("fromUser");
                pendingRequestsArray.add(i, fromUser.toString());

            }


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


        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.activity_friends, pendingRequestsArray);

        pendingRequestsListView.setAdapter(adapter);

When I try it on my app, I don't get any results on the listView, any help would be appreciated. Sorry for the repost but I have a lot more information and code now. Next time I won't ask a question without the code I have tried.

I have tried to use a Parse JSON class(Which I have now deleted because it was not working), but that doesn't work for me because I really need to send the post with parameters and the parse class I created couldn't do that. (Not sure how to do that. I'm not that advanced) — PurpSchurp
– PurpSchurp, Commented Mar 16, 2015 at 16:44
Hmm, I wish I could but I deleted it, Let me try to write up some new code @Fahim — PurpSchurp
– PurpSchurp, Commented Mar 16, 2015 at 16:47

mkorcha · Accepted Answer · 2015-03-16 16:53:20Z

0

Try using JSONArray - it has a constructor that accepts a JSON String, then you can access it. For example:

myJsonString = "{\"Andrew\", \"Jimmy\"}";

JSONArray array = new JSONArray(myJsonString);

for(int i = 0; i < array.length(); i++) {
    Log.v("json", array.optString(i));

    // You can also use this
    Log.v("json", array.getString(i));

    // Or this, but you have to coerce yourself
    Log.v("json", array.get(i).toString());
}

answered Mar 16, 2015 at 16:53

mkorcha

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Sherekan · Accepted Answer · 2015-03-16 16:55:23Z

0

In Android (i don't know if it's a Java feature) you can use JSONObject and JSONArray classes to parse, store and work with JSON

JSONObject myObject = new JSONObject(responseString);

Once your JSONObject is initialized you can fetch values from it with:

myObject.getString(key);//String, or Integer, or whatever JSON admits

edited Mar 16, 2015 at 16:55

answered Mar 16, 2015 at 16:48

Sherekan

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11 Comments

PurpSchurp Over a year ago

this is perfect, but what is the responseString, is this in the class I want to use the Object in, or is this in my class where I send the post? @Sherekan

Sherekan Over a year ago

"responseString" here is the response you fetch from your server, in this case it would be: [{"fromUser":"Andrew"},{"fromUser":"Jimmy"}] and you should use JSONArray class to store and process it, inside JSONArray class you can fetch each JSONObject with "myJSONArray.getJSONObject(int index)" method

PurpSchurp Over a year ago

So something like this JSONObject pendingUsers = new JSONObject("$myArray");

Sherekan Over a year ago

Eww, no, "$myArray" is a plain Java String and you need a JSON formatted string, the right answer would be JSONArray pendingUsers = new JSONArray("[{"fromUser":"Andrew"},{"fromUser":"Jimmy"}]"); but for sure you can put a variable holding that string inside the constructor. Notice that quote marks aren't escaped in this example, so if you hardcode this inside your IDE it won't work

Sherekan Over a year ago

Sorry i dind't see it, what does the log prints in "response.toString()"?

|

Soumojit Ghosh · Accepted Answer · 2015-07-23 20:55:11Z

Response:

[
 {"fromUser":"Andrew"},
 {"fromUser":"Jimmy"}
]

So basically, what you are receiving is a JSON Array. I would suggest, you rather encode your data as a JSON object from the backend and receive it on the app-side as,

{ 
   "DATA":[
      {"fromUser":"Andrew", "toUser":"Kevin"},
      {"fromUser":"Jimmy", "toUser":"David"}
    ]
}

This would be your android-end code in Java.

void jsonDecode(String jsonResponse) { try { JSONObject jsonRootObject = new JSONObject(jsonResponse); JSONArray jData = jsonRootObject.getJSONArray("DATA"); for(int i = 0; i < jData.length(); ++i) { JSONObject jObj = jData.getJSONObject(i); String fromUser = jObj.optString("fromUser"); String toUser = jObj.optString("toUser"); Toast.makeText(context, "From " + fromUser "To" + toUser + ".",0).show(); } } catch(JSONException e) { e.printStackTrace(); } }

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