gistfile1.java

public class Request {
    private String id = "null";
    private String method = "";
    private RequestParams params = new RequestParams();

    public String getId() {
        return id;
    }

    public String getMethod() {
        return method;
    }

    public Request setId(String id) {
        this.id = id;
        return this;
    }

    public Request setMethod(String method) {
        this.method = method;
        return this;
    }

    public Request addParam(String paramName, String value) {
        params.put(paramName, value);
        return this;
    }

    public Request addParam(String param, Object object) {
        params.put(param, object);
        return this;
    }

    public String toJson() {
        ObjectMapper objectMapper = new ObjectMapper();
        try {
            return objectMapper.writeValueAsString(this);
        } catch (IOException e) {
            e.printStackTrace();
            Log.e("JSON_GEN", e.getMessage());
        }
        return "";
    }

    private class RequestParams {
        private Map<String, Object> params = new HashMap<String, Object>();

        public void put(String paramName, Object object) {
            params.put(paramName, object);
        }

    }
}