Android Jetpack Compose Восстановление фокуса ТВ ⇐ Android

[Гость]

I have TvLazyRows inside TvLazyColumn. When I navigate to the end of all lists(position [20,20]) navigate to next screen and return back, focus is restored to the first visible position [15,1], not the position where I was before [20,20]. How can I restore focus to some specific position?





class MainActivity : ComponentActivity() { private val rowItems = (0..20).toList() private val rows = (0..20).toList() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { val navController = rememberNavController() MyAppNavHost(navController = navController) } } @Composable fun List(navController: NavController) { val fr = remember { FocusRequester() } TvLazyColumn( modifier = Modifier .focusRequester(fr) .fillMaxSize() , verticalArrangement = Arrangement.spacedBy(16.dp), pivotOffsets = PivotOffsets(parentFraction = 0.05f), ) { items(rows.size) { rowPos -> Column() { Text(text = "Row $rowPos") TvLazyRow( modifier = Modifier .height(70.dp), horizontalArrangement = Arrangement.spacedBy(16.dp), pivotOffsets = PivotOffsets(parentFraction = 0.0f), ) { items(rowItems.size) { itemPos -> var color by remember { mutableStateOf(Color.Green) } Box( Modifier .width(100.dp) .height(50.dp) .onFocusChanged { color = if (it.hasFocus) { Color.Red } else { Color.Green } } .background(color) .clickable { navController.navigate("details") } ) { Text(text = "Item ${itemPos.toString()}", Modifier.align(Alignment.Center)) } } } } } } LaunchedEffect(true) { fr.requestFocus() } } @Composable fun MyAppNavHost( navController: NavHostController = rememberNavController(), startDestination: String = "list" ) { NavHost( navController = navController, startDestination = startDestination ) { composable("details") { Details() } composable("list") { List(navController) } } } @Composable fun Details() { Box( Modifier .background(Color.Blue) .fillMaxSize()) { Text("Second Screen", Modifier.align(Alignment.Center), fontSize = 48.sp) } } } versions

dependencies { implementation 'androidx.core:core-ktx:1.10.1' implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.1' implementation 'androidx.activity:activity-compose:1.7.1' implementation platform('androidx.compose:compose-bom:2022.10.00') implementation 'androidx.compose.ui:ui' implementation 'androidx.compose.ui:ui-graphics' implementation 'androidx.compose.ui:ui-tooling-preview' implementation 'androidx.compose.material3:material3' testImplementation 'junit:junit:4.13.2' androidTestImplementation 'androidx.test.ext:junit:1.1.5' androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1' androidTestImplementation platform('androidx.compose:compose-bom:2022.10.00') androidTestImplementation 'androidx.compose.ui:ui-test-junit4' debugImplementation 'androidx.compose.ui:ui-tooling' debugImplementation 'androidx.compose.ui:ui-test-manifest' // Compose for TV dependencies def tvCompose = '1.0.0-alpha06' implementation "androidx.tv:tv-foundation:$tvCompose" implementation "androidx.tv:tv-material:$tvCompose" def nav_version = "2.5.3" implementation "androidx.navigation:navigation-compose:$nav_version" } I tried passing FocusRequestor to each focusable element inside list. In that case I was able to restore focus. But For big amount of elements inside list it starts crashing with OutOfMemmoryError. So I need some another solution.


Источник: https://stackoverflow.com/questions/762 ... -restoring