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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("


 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