Ich habe JSON-Parsing für Eclipse ADT durchgeführt und es lief perfekt. Bei Verwendung desselben Codes in Android Studio wurden jedoch Fehler in DefaultHttpClient und in allen anderen Wörtern in diesem Block angezeigt.

Hier ist meine JSON-Parserklasse

JSONParser.java

public class JSONParser {

    JSONArray cArray;
    JSONObject jsonObj;
    InputStream is = null;
    String jsonStr = "";
    String urlString;
    Context context;
    String id;
    String name, email, mobile;

    Contacts contacts;
    List < Contacts > contactList;

    public JSONParser() {
        // TODO Auto-generated constructor stub
    }

    public JSONParser(String url) {
        this.urlString = url;
    }

    public List < Contacts > getString() {

        contactList = new ArrayList < Contacts > ();

        try {
            // **Error in this block**

            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(urlString);

            HttpResponse httpResponse = httpClient.execute(httpPost);

            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            Log.e("NULL DATA", "cant fetch " + e.toString());
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();

            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            jsonStr = sb.toString();


        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }


        if (jsonStr != null) {
            try {

                cArray = new JSONArray(jsonStr);

                JSONObject jsonObj = null;

                // looping through All Contacts
                for (int i = 0; i < cArray.length(); i++) {
                    jsonObj = cArray.getJSONObject(i);

                    id = jsonObj.getString("foodno");
                    name = jsonObj.getString("foodname");
                    email = jsonObj.getString("foodtype");

                    /* JSONObject phoneNo = jsonObj.getJSONObject("phone");
                     mobile = phoneNo.getString("mobile");*/

                    contacts = new Contacts(id, name, email);


                    // adding contact to contact list
                    contactList.add(contacts);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (NullPointerException e) {
                e.printStackTrace();
            }

        } else {
            Log.e("JSONParser", "Couldn't get any data from the url");
        }


        return contactList;

    }

}

Kann jemand vorschlagen, wie man eine Verbindung herstellt, um den JSON-String zu erhalten, den ich an BufferedReader übergeben kann?