A navigation graph is an XML file which contains the destinations that will be included in the app navigation. In addition to these destinations, the file also contains navigation actions that define navigation between destinations, and optional arguments for passing data from one destination to another. Android Studio includes a navigation graph editor that can be used to design graphs and implement actions either visually or by manually editing the XML.
Figure 40-5, shows the Android Studio navigation graph editor in Design mode:
The destinations list (A) provides a list of all of the destinations currently contained within the graph. Selecting a destination from the list will locate and select the corresponding destination in the graph (particularly useful for locating specific destinations in a large graph). The navigation graph panel (B) contains a dialog for each destination showing a representation of the user interface layout...
