//Initialize an instance of PicoUrl
picoUrl = new PicoUrl.Builder()
                .baseUrl("http://mysite.com")
                .build();
//Create a url that your app understands and can parse:
Uri shareUrl = Uri.parse("http://mysite.com");
shareUrl = shareUrl.buildUpon()
        .appendQueryParameter("id", someId))
        .appendQueryParameter("referer", userId))
        .appendQueryParameter("unicorns", "true"))
        .build();
//Turns http://mysite.com?id=someId&referer=userId&unicorns=true
//into http://mysite.com?tinyUrl=j71a1h
picoUrl.generate(shareUrl).subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new SingleObserver<Uri>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                    }

                    @Override
                    public void onError(Throwable e) {
                        e.printStackTrace();
                        //Alert your user!
                    }

                    @Override
                    public void onSuccess(Uri url) {
                        //Send the link to the other user, or post it on the internet for others to click!
                    }
                });

//When receiving the shortened url:
picoUrl.parse(shortenedUrl).subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(new SingleObserver<Uri>() {
                        @Override
                        public void onSubscribe(Disposable d) {
                        }

                        @Override
                        public void onError(Throwable e) {
                            e.printStackTrace();
                            //Alert your user!
                        }

                        @Override
                        public void onSuccess(Uri url) {
                            String id = url.getQueryParameter("id");
                            //Do what you need to with the values
                        }
                    });