我们如何将参数传递给 viewModel
在 Jetpack Compose
?
这是我的可组合
@Composable
fun UsersList() {
val myViewModel: MyViewModel = viewModel("db2name") // pass param like this
}
这是viewModel
class MyViewModel(private val dbname) : ViewModel() {
private val users: MutableLiveData<List<User>> by lazy {
MutableLiveData<List<User>>().also {
loadUsers()
}
}
fun getUsers(): LiveData<List<User>> {
return users
}
private fun loadUsers() {
// Do an asynchronous operation to fetch users.
}
}
最佳答案
您需要创建一个工厂来将动态参数传递给 ViewModel,如下所示:
class MyViewModelFactory(private val dbname: String) :
ViewModelProvider.NewInstanceFactory() {
override fun <T : ViewModel?> create(modelClass: Class<T>): T = MyViewModel(dbname) as T
}
然后在可组合函数中使用你的工厂:@Composable
fun UsersList() {
val myViewModel: MyViewModel =
viewModel(factory = MyViewModelFactory("db2name")) // pass param like this
}
现在您可以访问 ViewModel 中的 dbname 参数:class MyViewModel(private val dbname) : ViewModel() {
// ...rest of the viewModel logics here
}
关于android - Jetpack Compose 将参数传递给 viewModel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/67982230/