CODEWITHSUNDEEP
androidkotlinandroid-jetpack-composeandroid-jetpack-navigation
fansan
fansan

Reputation: 73

Jetpack Compose add onClick will Recomposing

my code

@Composable
fun AlbumPage(navHostController: NavHostController) {
   ElevatedButton(onClick = {
      navHostController.popBackStack()
   }) {
      Text(text = "click")
   }

   SideEffect {
        Log.d("tag","1111")
   }
}

when i set navHostController.popBackStack() in onClick{},log show twice

14:53:34.452 D 1111

14:53:34.816 D 1111

I remove navHostController.popBackStack()

@Composable
fun AlbumPage(navHostController: NavHostController) {
   ElevatedButton(onClick = {
      //navHostController.popBackStack()
   }) {
      Text(text = "click")
   }

   SideEffect {
        Log.d("tag","1111")
   }
}

log once

why?

Upvotes: 2

Views: 751

Answers (1)

C.F.G
C.F.G

Reputation: 1463

Description of the source file NavHostController.kt

When the given navController
 * changes the back stack due to a [NavController.navigate] or [NavController.popBackStack] this
 * will trigger a recompose and return the top entry on the back stack.
 *
 * @return a mutable state of the current back stack entry

Upvotes: 2

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