Through this volley string request you can hit server for String response

VolleyStringRequestJava.java

private static final int MY_SOCKET_TIMEOUT_MS = 10000;
ProgressDialog ringProgressDialog;

ringProgressDialog = ProgressDialog.show(this, "", "please wait", true);
        ringProgressDialog.setCancelable(false);
        ringProgressDialog.show();

        StringRequest request = new StringRequest(Request.Method.POST, End_Points.CHECK_LEAVES,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        ringProgressDialog.dismiss();

                        remaining_leaves.setText(response);

                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(Leave_Activity.this, error.toString(), Toast.LENGTH_SHORT).show();
                ringProgressDialog.dismiss();
            }
        }) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {

                Map<String, String> params = new HashMap<>();
                params.put("user_id", userid);

                return params;
            }
        };
        request.setRetryPolicy(new DefaultRetryPolicy(
                MY_SOCKET_TIMEOUT_MS,
                DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));


        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
        requestQueue.add(request);