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implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.5.1'

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package com.example.hellojetpack.screen.edit

class EditNoteViewModel {
}

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https://youtu.be/961Bd4UQOl0?t=87

import android.app.Application
import androidx.lifecycle.AndroidViewModel

class EditNoteViewModel(app:Application): AndroidViewModel(app){
}

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class EditNoteViewModel(
    app:Application
): AndroidViewModel(app){
    val repo: NoteRepository = DatastoreNoteRepository(app)
}

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https://youtu.be/961Bd4UQOl0?t=136

@Composable
fun EditScreen(viewModel: EditNoteViewModel = viewModel() 
  ) {
  // ...
}

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@Composable
fun NoteApp() {
    EditScreen()
}

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MainActivity（root）
- > noteapp（容器）
- > editnotescreen（组件）
- > editnoteviewModel（viewModel）

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fun EditScreen(viewModel: EditNoteViewModel = viewModel() ) {
    var body by remember { mutableStateOf("") }
    Scaffold(
        topBar = {
            TopAppBar(
                title = {
                    Text(text = "NoteApp")
                },
                actions = {
                    IconButton(onClick = {
                        println(body)
                        viewModel.save(body)
                    }) {
                        Icon(
                           Icons.Default.Done,
                           contentDescription = stringResource(id = R.string.app_name)
                        )
                    }
                }
            )
        }
    ) 
// ...

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