rebase

app/src/main/java/com/google/samples/apps/nowinandroid/ui/NiaApp.kt

@@ -39,10 +39,13 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.windowsizeclass.WindowSizeClass
 import androidx.compose.material3.windowsizeclass.WindowWidthSizeClass
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.ui.Modifier
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.ui.Modifier
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
@@ -155,15 +158,20 @@ private fun NiABottomBar(
             tonalElevation = 0.dp
         ) {
 
-            TOP_LEVEL_DESTINATIONS.forEach { destination ->
-                val selected =
-                    currentDestination?.hierarchy?.any { it.route == destination.route } == true
+            var selected by rememberSaveable {
+                mutableStateOf(0)
+            }
+            TOP_LEVEL_DESTINATIONS.forEachIndexed { index, destination ->
+                val isSelect = selected == index
                 NavigationBarItem(
-                    selected = selected,
-                    onClick = { onNavigateToTopLevelDestination(destination) },
+                    selected = isSelect,
+                    onClick = {
+                        selected = index
+                        onNavigateToTopLevelDestination(destination)
+                    },
                     icon = {
                         Icon(
-                            if (selected) {
+                            if (isSelect) {
                                 destination.selectedIcon
                             } else {
                                 destination.unselectedIcon