片段中的生命周期作用域

class MyViewModel : ViewModel() {
    init {
        viewModelScope.launch {
            // 执行异步操作
        }
    }
}

class MyActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        lifecycleScope.launch {
            // 执行异步操作
        }
    }
}

class MyViewModel : ViewModel() {
    val myLiveData: LiveData<String> = liveData {
        // 执行异步操作并发送结果
    }
}

class MyFragment : Fragment() {
    private val viewModel: MyViewModel by viewModels()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        viewModel.myLiveData.observe(viewLifecycleOwner, Observer {
            // 更新UI
        })
    }
}