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app.component.html

<ul class="nav navbar-nav navbar-right" *ngIf="usuario.verificaLogado">
   <li><a href="../navbar/">Olá</a></li>    
</ul>

usuario.component.ts

export class UsuarioComponent implements OnInit {

  @Input() _id: string;
  @Input() login: string;
  @Input() senha: string;
  @Input() nome: string;

  constructor() { }

  ngOnInit() {
  }


}

usuario.service.component.ts

verificaLogado(): Boolean {
    return true;
  }