volley string request

public static void postNewComment(Context context,final UserAccount userAccount,final String comment,final int blogId,final int postId){ mPostCommentResponse.requestStarted(); RequestQueue queue = Volley.newRequestQueue(context); StringRequest sr = new StringRequest(Request.Method.POST,"http://api.someservice.com/post/comment", new Response.Listener<String>() { @Override public void onResponse(String response) { mPostCommentResponse.requestCompleted(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { mPostCommentResponse.requestEndedWithError(error); } }){ @Override protected Map<String,String> getParams(){ Map<String,String> params = new HashMap<String, String>(); params.put("user",userAccount.getUsername()); params.put("pass",userAccount.getPassword()); params.put("comment", Uri.encode(comment)); params.put("comment_post_ID",String.valueOf(postId)); params.put("blogId",String.valueOf(blogId)); return params; } @Override public Map<String, String> getHeaders() throws AuthFailureError { Map<String,String> params = new HashMap<String, String>(); params.put("Content-Type","application/x-www-form-urlencoded"); return params; } }; queue.add(sr); } public interface PostCommentResponseListener { public void requestStarted(); public void requestCompleted(); public void requestEndedWithError(VolleyError error);