Xtykutl

I've builded a simple app in Android where I use Google Maps directions api.
In my code I make a Volley request and it works, but almost always it response ZERO_RESULTS.
But if I copy the value of the uri and I paste it into browser, it response some result.

Here is my code

RequestQueue requestQueue = Volley.newRequestQueue(this);

    String uri = null;

    uri = "https://maps.googleapis.com/maps/api/directions/json?" +

            "origin=" + partenza + "&" +

            "destination=" + arrivo +

            "&waypoints=optimize:true";





    for(int i = 0; i<tappe.size();i++){

        uri = uri.concat("|").concat(tappe.get(i));

    }





    uri = uri + "&key=" + getString(R.string.google_maps_key);

    uri = Uri.parse(uri).buildUpon()

            .build().toString();





    JsonObjectRequest stringRequest = new JsonObjectRequest(

            Request.Method.POST, uri, null, new Response.Listener<JSONObject>() {

        @Override

        public void onResponse(JSONObject response) {

            try {

                JSONObject obj = new JSONObject(String.valueOf(response));

                JSONArray cast = obj.getJSONArray("routes");

                if(obj.getString("status").equals("ZERO_RESULTS")){

                    Toast.makeText(TragittoActivity.this, "Impossibile trovare soluzione", Toast.LENGTH_SHORT).show();

                    finish();

                }

                for (int i=0; i<cast.length(); i++) {

                    JSONObject news = cast.getJSONObject(i);

                    JSONArray legs = news.getJSONArray("legs");



                    for (int j=0; j<legs.length(); j++) {

                        String start = legs.getJSONObject(j).getString("start_address");

                        String end = legs.getJSONObject(j).getString("end_address");



                    }



                }



            } catch (JSONException e) {

                e.printStackTrace();

            }

        }



    }, new Response.ErrorListener() {



        @Override

        public void onErrorResponse(VolleyError error) {

            Log.e("VolleyError", error.toString());

        }



    }) {



    };

    requestQueue.add(stringRequest);

How can I resolve this problem?
Are any differences between web call and Android call?

The issue looks to be related to the call format:

1. Try parsing the URI "manually" (like replacing the spaces with "%20" using the replace function) instead of using the Uri.Parse function.


2. Try getting the response as a string instead of JSON: instead of using a JsonObjectRequest use a StringRequest and then converting the string to a JSONObject
   


3. Since you are passing the parameters in the URL and you are setting the method parameters to null, try using a GET method instead of POST