SingleResponsibility.java

RetrofitClient client = new Retrofit.Builder()
                /*configure Retrofit */
                .build().create(RetrofitClient.class);
                
private void retrieveSomeValue(String param) {
        client.doRequest(param)
                .subscribe(response ->{
                    getContext().getSharedPreferences("sharedpreferences", Context.MODE_PRIVATE)
                            .edit()
                            /*write response to disk */
                            .commit();
                    GlobalStateManager.getInstance(getContext(), response); // which then updates some global flags and 
                        //uses context to launch an activity
                });
    }