在Jetpack @Compose函数中使用LiveData作为状态

import androidx.compose.material.Text
import androidx.compose.material.Surface
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.launch

class MyViewModel : ViewModel() {
    private val _text = MutableLiveData<String>()
    val text: LiveData<String> get() = _text

    fun updateText(newText: String) {
        viewModelScope.launch {
            _text.value = newText
        }
    }
}

@Composable
fun LiveDataExample(viewModel: MyViewModel) {
    var text by remember { mutableStateOf("") }

    // Observe LiveData and update the state
    LaunchedEffect(Unit) {
        viewModel.text.observeForever { newText ->
            text = newText
        }
    }

    Surface {
        Text(text = text)
    }
}

LaunchedEffect(Unit) {
    viewModel.text.observeForever { newText ->
        text = newText
    }
}

var text by remember { mutableStateOf("") }