make pull_list by volley

[Seulin]

//gradle 추가 : implementation 'com.android.volley:volley:1.1.1'
// manifests에 internet permission 허용:

    RequestQueue queue = Volley.newRequestQueue(this);
    String url = "http://192.249.19.251:780/api/locations";
    Log.d("dbProcess", url+"");

    final JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET, url, null, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            try {Log.d("onrespone", response+"");
                for (int i = 0; i < response.length(); i++) {
                    JSONObject jsonObject = response.getJSONObject(i);
                    int index = Integer.parseInt(jsonObject.getString("index"));
                    String name = jsonObject.getString("name");
                    String address = jsonObject.getString("address");
                    float latitude = Float.parseFloat(jsonObject.getString("latitude"));
                    float longtitude = Float.parseFloat(jsonObject.getString("longtitude"));
                    LocationInfo loc = new LocationInfo(index, name, address, latitude, longtitude);
                    Log.d("dbprocess", loc+"");
                    pull_list.add(loc);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
        }
    });
    queue.add(jsonArrayRequest);