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How can one prevent the occurrence of IllegalArgumentException when a route is not found in the navigation graph by verifying if the route already exists in Jetpack Navigation?

asked 2021-11-16 11:00:00 +0000

pufferfish gravatar image

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answered 2021-09-23 19:00:00 +0000

david gravatar image

One way to prevent the IllegalArgumentException when a route is not found in the navigation graph is to verify if the route already exists in Jetpack Navigation. This can be done by using the Navigation.findNavController(view) method and passing the view as a parameter.

Once the NavController object is obtained, one can use the getGraph() method to retrieve the NavGraph object that represents the current navigation graph. This NavGraph object can be used to verify if the desired route exists in the graph by calling the findNode() method and passing the destination ID.

If the findNode() method returns null, it means that the destination with the given ID does not exist in the navigation graph. In such cases, a warning can be displayed to the user or the code logic can be modified to handle such scenarios gracefully without throwing an exception.

Here is an example code snippet that demonstrates this approach:

// Obtain the NavController object
NavController navController = Navigation.findNavController(view);

// Retrieve the NavGraph object
NavGraph navGraph = navController.getGraph();

// Verify if the destination exists in the graph
NavDestination destination = navGraph.findNode(destinationId);

if (destination == null) {
    // Destination not found, handle the scenario gracefully
} else {
    // Navigate to the destination
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Asked: 2021-11-16 11:00:00 +0000

Seen: 2 times

Last updated: Sep 23 '21