"如何处理 Jetpack Compose 中的导航？"

Question

In Jetpack Compose, how is navigation supposed to be done? All (and there aren't many) examples (including the official sample from Google) use sealed classes and loading new screens in reaction to observing the change in the current screen. This does (sort of) work, but provides no navigation backstack, and the phone's back button is totally unaware, just closes the app instead of going back to the previous screen. Is this supposed to somehow converge with the navigation component from AndroidX - but it's XML based, and Compose is all about moving away from XML? Or is there a brand new navigation concept coming, perhaps similar to SwiftUI (navigationlink, etc)? This seems to be one of the biggest roadblocks - as without navigation you can only have a toy app. Anyone aware of the roadmap here?

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Answer 1

New Jetpack lib has published for Compose navigation. It is still in alpha.

In this new library, now user can able to navigation between different composables with navigation components features.

Using navigation-compose :

dependencies {
    def nav_compose_version = "1.0.0-alpha01"
    implementation "androidx.navigation:navigation-compose:$nav_compose_version"
}

Example:

Step 1: create a NavController by using the rememberNavController() method in your composable: Link :

val navController = rememberNavController()

Step 2: Creating the NavHost requires the NavController previously created via rememberNavController() and the route of the starting destination of your graph: Link .

NavHost(navController, startDestination = "profile") {
    composable("profile") { Profile(...) }
    composable("friendslist") { FriendsList(...) }
    ...
}

Step 3: To navigate to a composable use navigate() :

fun Profile(navController: NavController) {
    ...
    Button(onClick = { navController.navigate("friends") }) {
        Text(text = "Navigate next")
    }
    ...
}

check more https://developer.android.com/jetpack/compose/navigation

Answer 2

Here is an unofficial approach of navigation in Jetpack Compose. Try it out until you get an official word from the Google android devs.

compose-router

https://github.com/zsoltk/compose-router

Answer 3

It seems that they are moving away from XML.

The new official samples released after the release of 1.0.0-alpha, have a shared code to manage backstack and navigation. This code is not part of the library yet.

https://github.com/android/compose-samples/blob/master/Owl/app/src/main/java/com/example/owl/ui/utils/Navigation.kt https://github.com/android/compose-samples/blob/master/Jetsnack/app/src/main/java/com/example/jetsnack/ui/utils/Navigation.kt

Answer 4

I have writed how to handle Navigation with Jetpack Compose

Link : https://medium.com/@gsaillen95/how-to-handle-navigation-in-jetpack-compose-a9ac47f7f975

Answer 5

Here is another good alternative library for Compose Navigation: