Android Room with Jetpack Compose - Update LiveData after add a item in another activity

Question

I'm adding a new contact on the NewContactActivity and after complete inserts on the DB and closes the activity but this not update the contacts list

MainActivity:

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            AppTheme {
                val contatoViewModel: ContatoViewModel = viewModel(factory = ContatoViewModelFactory(LocalContext.current.applicationContext as Application))
                val contatos = contatoViewModel.readAllData.observeAsState(listOf()).value
                val novoContatoLaunch = rememberLauncherForActivityResult(ActivityResultContracts.StartActivityForResult()) {
                    run {
                        when(it.resultCode) {
                            RESULT_OK -> {
                                Toast.makeText(this@MainActivity, "Contato Salvo!", Toast.LENGTH_LONG).show()
                                //TODO I need to update the contatos here
                            }
                        }
                    }
                }
                MainView(contatos) {
                    novoContatoLaunch.launch(Intent(this@MainActivity, NovoContatoActivity::class.java))
                }
            }
        }
    }

NewContactActivity

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            AppTheme {
                val contatoViewModel: ContatoViewModel = viewModel(factory = ContatoViewModelFactory(LocalContext.current.applicationContext as Application))

                NovoContatoView {
                    contatoViewModel.addContato(it)
                    setResult(RESULT_OK)
                    finish()
                }
            }
        }
    }

Answer 1

Seems like the answer will be inside your ContatoViewModel . If you're using LiveData via room library this should update automatically after the change in database. If not, just call some method in ContatoViewModel that will read changes from the database and update the underlying live data