How do I construct a URI that allows me to navigat...

# compose

[Jorge Domínguez]

How do I construct a URI that allows me to navigate to a destination that supports deeplinks? I have a destination that looks like this:

composable(
    route = Destination.Route,
    deepLinks = listOf(
        navDeepLink { uriPattern = "/path1" },
        navDeepLink { uriPattern = "/path1/{argument1}" },
        navDeepLink { uriPattern = "/path2/{argument2}" },
    ),
)

So when I click on a link like https://www.test.com/path1/123 the app opens the destination correctly, however when I try to do the same thing programmatically by doing:

navController.navigate(Uri.parse(URLEncoder.encode("<https://www.test.com/path1/123>", "UTF-8"))

I get a

java.lang.IllegalArgumentException: Navigation destination that matches request NavDeepLinkRequest{ uri=https%3A%2F%2Ftest.com%2Fpath1%2F123 } cannot be found in the navigation graph

any idea what I might be doing wrong here?

[Skaldebane]

maybe you should remove the protocol + host (<https://www.test.com/>) and only keep the path?

[Jorge Domínguez]

I tried that already but it doesn’t work

[Skaldebane]

looking at navigation docs, maybe it's the opposite?

[Skaldebane]

try including the host in the deepLinks uri patterns

[Skaldebane]

From the docs:

val uri = "<https://www.example.com>"

composable(
    "profile?id={id}",
    deepLinks = listOf(navDeepLink { uriPattern = "$uri/{id}" })
) { backStackEntry ->
    Profile(navController, backStackEntry.arguments?.getString("id"))
}

[Stylianos Gakis]

The type safe APIs also hint towards this by asking you to pass in the base path https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:navigation/navigation-common/src/main/java/androidx/navigation/NavDeepLink.kt;l=619?q=fromUriPattern while they generate the rest of it for you

Here's some tests to get some inspiration from https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:navigation/navigation-common/src/androidTest/java/androidx/navigation/NavDeepLinkTest.kt;l=2001?q=fromUriPattern

[Ian Lake]

Your Uri.parse(URLEncoder.encode( also is very suspect - generally you just pass the string to Uri.parse - encoding it ahead of time is actually stripping all of the / and other symbols from the Uri (which is why you see https%3A%2F%2F for instance). I don't know why you'd encode the whole string (if anything, you'd use Uri.encode around a single argument)

[Skaldebane]

@Ian Lake makes sense
there's also a String.toUri() extension function in androidx, much simpler

[Jorge Domínguez]

I was already adding the host to the `uriPattern`s, I just omitted that for brevity. I checked the link provided by @Stylianos Gakis and noticed the validation where even if the uri string doesn’t have the scheme the resulting NavDeepLink does have it, so I added "https://" to the `uriPattern`s and now it works, however the uri that I pass to navController.navigate() has to be parsed from a string matching exactly that pattern, so it has to be "<https://www.test.com/path1>", it can’t be "<http://test.com/path1|test.com/path1>" or "<http://www.test.com/path1|www.test.com/path1>", which kinda weirds me out because in the test provided by Stylianos the uri string doesn’t have the scheme, is this expected?

[Ian Lake]

As per the docs https://developer.android.com/guide/navigation/design/deep-link#implicit

URIs without a scheme are assumed as either http or https. For example, www.google.com matches both http://www.google.com and https://www.google.com.