Mapbox Android NavigationView Click Event

[SrknMcT]

I want to learn what's being done when user set up a route by clicking on a point on NavigationView.Everything is open about Mapview but, as for NavigationView, all looks like a closed box. So, I couldn't manage to open a NavigationView screen with already setted up route between two points. How can I achieve this? How can those functions be useful? -- navigationView.api.setDestination(point), navigationView.api.setRoutes(routes). Any help will be appreciated. Thanks in advance