ViewModel Demo
dependencies implementation(libs.androidx.lifecycle.viewmodel.ktx) implementation(libs.androidx.lifecycle.livedata.ktx) 一个继承自 ViewModel 的类 class MainViewModel : ViewModel() { private val _number = MutableStateFlow(100) val number: StateFlow<Int> get() = _number } 使用它 class MainActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) enableEdgeToEdge() setContent { val mainViewModel: MainViewModel by viewModels() val numberState by mainViewModel.number.collectAsState() ViewModelDemoTheme { Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding -> Greeting( num = numberState, modifier = Modifier.padding(innerPadding) ) } } } } } @Composable fun Greeting(num: Int, modifier: Modifier = Modifier) { Text( text = num.toString(), modifier = modifier ) }