自定义请求未调用Android Volley getParams

public class CustomRequest extends Request<JSONObject> {
    private Response.Listener<JSONObject> mListener;

    public CustomRequest(int method, String url, Response.Listener<JSONObject> listener, Response.ErrorListener errorListener) {
        super(method, url, errorListener);
        mListener = listener;
    }

    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        Map<String, String> params = new HashMap<>();
        params.put("param1", "value1");
        params.put("param2", "value2");
        return params;
    }

    @Override
    protected void deliverResponse(JSONObject response) {
        mListener.onResponse(response);
    }

    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
        try {
            String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
            return Response.success(new JSONObject(jsonString), HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException | JSONException e) {
            return Response.error(new ParseError(e));
        }
    }
}