I am upgraded to: Kotlin 1.4.30 Compose 1.0.0-alpha12 NavigationCompose 1.0.0-alpha07 I get this error:

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/activity/compose/LocalOnBackPressedDispatcherOwner;
    at androidx.navigation.compose.NavHostKt.NavHost(NavHost.kt:83)
    at androidx.navigation.compose.NavHostKt.NavHost(NavHost.kt:59)
    at myapp.android.NavigationKt.Navigation(Navigation.kt:22)

any idea?

Upgrade to Activity Compose alpha02: https://kotlinlang.slack.com/archives/CJLTWPH7S/p1613068198230100?thread_ts=1613067938.229500&cid=CJLTWPH7S

thanks! It fixed it However I still have another error:

The problem is that your IDE is still using an old Kotlin plugin, since AndroidStudio with stable 1.4.30 hasn't yet been released, so you'll need to change your kotlin update channel. Assuming you are on a recent/latest canary, you should be able to open "Preferences" > "Languages & Frameworks" > "Kotlin", and then change the "Update Channel"

thanks @jim I was able to download the preview Kotlin 1.4.30 plugin!

activity-compose

has

activity-ktx

as a transitive dependency, so you definitely don't need both of those (just

activity-compose

is enough)

thanks, at least one goes away

The rest of them are perhaps more of a "do you need them" question.

activity-ktx

will already give you

core-ktx:1.1.0

(so the question is do you specifically want extensions from the newer version? Only then do you need to declare what specific version you want) and a pure compose app with no Views whatsoever doesn't need

material

or

appcompat

either (as those are primarily View focused dependencies)

@Ian Lake I am currently using:

class MainActivity : AppCompatActivity() {

  private val appViewModel: AppViewModel by viewModels()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent {
      MyAppTheme(appViewModel.KMPModel) {
        Navigation(appViewModel.KMPModel)
      }
    }
  }

}

I didn’t know about

ComponentActivity

, is it new?

It has been the base class under

AppCompatActivity

and

FragmentActivity

for a year and a half or so now

I didn’t know about

ComponentActivity

! The code snippet on JetpackCompose tutorial page uses:

AppCompatActivity

https://developer.android.com/jetpack/compose/tutorial I have just replaced

AppCompatActivity

with

ComponentActivity

in my app and it seems to work correctly. So, can I safely use it?

If you have no Android Views and aren't using any AppCompat APIs or any Fragment APIs, then AppCompatActivity isn't really doing anything for you and, yep,

ComponentActivity

should be enough

Thanks @Ian Lake! So, I guess if I want to use some WebViews, I would need to use AppCompatActivity, or do you expect to release WebViews for Compose?

WebView is a weird one, since it is a black box into web content and web content doesn't rely on AppCompat hooks either.

Interesting, to know!