Android getBytes() UTF-8

I'm trying to make a POST gson request... I need to pass a body as an array of bytes...

In my textview into the final of the array, it was showing /u0000... And when it call the server, the server send me 400...

JSONObject jsonObjectUsuario = new JSONObject(); try { jsonObjectUsuario.put("nome", et_nome.getText().toString()); jsonObjectUsuario.put("cpf", et_cpf.getText().toString()); jsonObjectUsuario.put("email", et_email.getText().toString()); jsonObjectUsuario.put("senha", et_password.getText().toString()); } catch (JSONException e) { e.printStackTrace(); } UserRequestHelper.userRequest( Request.Method.POST, EndpointURL.POST_USUARIO, jsonObjectUsuario.toString().getBytes(), new Response.Listener<Usuario>() { @Override public void onResponse(Usuario response) { Toast.makeText( getActivity(), "Cadastro realizado com sucesso!", Toast.LENGTH_SHORT).show(); getActivity() .getSupportFragmentManager() .beginTransaction() .replace(R.id.fragment_initial, new LoginFragment()) .remove(new UsuarioFragment()) .commit(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Toast.makeText( getActivity(), "Erro ao realizar cadastro.", Toast.LENGTH_SHORT) .show(); } } ); 

The Request

 public GsonRequest(int method, String url, Class<T> clazz, byte[] body, Response.Listener<T> listener, Response.ErrorListener errorListener) { super(method, url, errorListener); this.clazz = clazz; this.body = body; this.listener = listener; } 

User Request Code...

 public static void userRequest(int method, String url, byte[] body, Response.Listener<Usuario> listener, Response.ErrorListener errorListener){ GsonRequest<Usuario> usuarioGsonRequest = new GsonRequest<>(method, url, Usuario.class, body, listener, errorListener); VolleySingleton.getsInstance().addToRequestQueue(usuarioGsonRequest); } 

The GsonRequest body...

@Override public byte[] getBody() throws AuthFailureError { return body != null ? body : super.getBody(); } 

What's wrong? Someone have an Gson POST request example for me?

Please, help me!!!