Json没有填充一个微调器

Question

公共类FindPlaces扩展了AppCompatActivity {

private static final String MAP_API_URL = "https://api.foursquare.com/v2/venues/categories?client_id=AW31XQWUOLJWFZCFNZZ04I4IQFUFYIFAFDEHEYITEBBDHIVB&client_secret=R10S3ACA5VFOTGVG2LW1N4YONU30LQ3IE0DKIG1JNHN2QNWE&v=20170811&m=foursquare";
JSONObject jsonobject;
JSONArray jsonarray;
ProgressDialog mProgressDialog;
ArrayList<String> categoriesList;
ArrayList<Categories> categories;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_find_places);

    new DownloadJSON().execute();

}
private class DownloadJSON extends AsyncTask<Void, Void, Void> {

    @Override
    protected Void doInBackground(Void... params) {
        // Locate the Categories Class
        categories = new ArrayList<Categories>();
        // Create an array to populate the spinner
        categoriesList = new ArrayList<String>();
        // JSON file URL address
        jsonobject = JSONfunctions
                .getJSONfromURL("https://api.foursquare.com/v2/venues/categories?client_id=CONSUMER_KEY&client_secret=CONSUMER_SECRET&v=20170811&m=foursquare");

        try {
            // Locate the NodeList name
            jsonarray = jsonobject.getJSONArray("categories");
            for (int i = 0; i < jsonarray.length(); i++) {
                jsonobject = jsonarray.getJSONObject(i);

                Categories cat = new Categories();

                cat.setName(jsonobject.optString("name"));

                categories.add(cat);

                // Populate spinner with country names
                categoriesList.add(jsonobject.optString("name"));


            }
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void args) {
        // Locate the spinner in activity_main.xml
        Spinner mySpinner = (Spinner) findViewById(R.id.spinnerCategories);

        // Spinner adapter
        mySpinner
                .setAdapter(new ArrayAdapter<String>(FindPlaces.this,
                        android.R.layout.simple_spinner_dropdown_item,
                        categoriesList));

        // Spinner on item click listener
        mySpinner
                .setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> arg0,
                                               View arg1, int position, long arg3) {
                        // TODO Auto-generated method stub
                        // Locate the textviews in activity_main.xml
                        TextView txtname = (TextView) findViewById(R.id.tvName);
                        txtname.setText(categories.get(position).getName());
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub
                    }
                });
    }
}

这是我的课程，给旋转器充气。

public class JSONfunctions {

public static JSONObject getJSONfromURL(String url) {
    InputStream is = null;
    String result = "";
    JSONObject jArray = null;

    // Download JSON data from URL
    try {
        HttpClient httpclient = new DefaultHttpClient();
        HttpGet httppost = new HttpGet(url);
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();

    } catch (Exception e) {
        Log.e("log_tag", "Error in http connection " + e.toString());
    }

    // Convert response to string
    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();
        result = sb.toString();
    } catch (Exception e) {
        Log.e("log_tag", "Error converting result " + e.toString());
    }

    try {

        jArray = new JSONObject(result);
    } catch (JSONException e) {
        Log.e("log_tag", "Error parsing data " + e.toString());
    }

    return jArray;
}

}

这是我处理http请求的地方

  

{“response”：{       “类别”：[          {           “id”：“4d4b7104d754a06370d81259”，           “名称”：“艺术与娱乐”，           “pluralName”：“艺术与娱乐”，           “shortName”：“艺术与娱乐”，           “icon”：{             “prefix”：“https://ss3.4sqi.net/img/categories_v2/arts_entertainment/default_”，             “后缀”：“。png”           }，           “类别”：[              {               “id”：“56aa371be4b08b9a8d5734db”，               “名字”：“露天剧场”，               “pluralName”：“Amphitheatre”，               “shortName”：“露天剧场”，               “icon”：{                 “prefix”：“https://ss3.4sqi.net/img/categories_v2/arts_entertainment/default_”，                 “后缀”：“。png”               }

这是json。

如何更改获取请求而不是发布请求？ 我怎么能填充我的微调器？ 提前谢谢。