retrofit2-EventListener.java

EventListener.java

Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
    GitHubService gitHubService = GitHubService.retrofit.create(GitHubService.class);
    final Call<List<Contributor>> call = gitHubService.repoContributors("square", "retrofit");
    new NetworkCall().execute(call);
  }
});