Volley JsonObjectRequest Post parameters no longer work

You just have to make a JSONObject from your HashMap of parameters:

String url = "https://www.youraddress.com/";Map<String, String> params = new HashMap();params.put("first_param", 1);params.put("second_param", 2);JSONObject parameters = new JSONObject(params);JsonObjectRequest jsonRequest = new JsonObjectRequest(Request.Method.POST, url, parameters, new Response.Listener<JSONObject>() {    @Override    public void onResponse(JSONObject response) {        //TODO: handle success    }}, new Response.ErrorListener() {    @Override    public void onErrorResponse(VolleyError error) {        error.printStackTrace();        //TODO: handle failure    }});Volley.newRequestQueue(this).add(jsonRequest);

I ended up using Volley's StringRequest instead, because I was using too much valuable time trying to make JsonObjectRequest work.

RequestQueue queue = Volley.newRequestQueue(this);String url ="http://myserveraddress";StringRequest strRequest = new StringRequest(Request.Method.POST, url,                new Response.Listener<String>()                {                    @Override                    public void onResponse(String response)                    {                        Toast.makeText(getApplicationContext(), response, Toast.LENGTH_SHORT).show();                    }                },                new Response.ErrorListener()                {                    @Override                    public void onErrorResponse(VolleyError error)                    {                        Toast.makeText(getApplicationContext(), error.toString(), Toast.LENGTH_SHORT).show();                    }                })        {            @Override            protected Map<String, String> getParams()            {                Map<String, String> params = new HashMap<String, String>();                params.put("tag", "test");                return params;            }        };queue.add(strRequest);

This worked for me. Its just as simple as JsonObjectRequest, but uses a String instead.

I had a similar problem, but I found out that the problem was not on the client side, but in the server side. When you send a JsonObject, you need to get the POST object like this (in the server side):

In PHP:

$json = json_decode(file_get_contents('php://input'), true);