我的MVVM Room recyclerview杀死应用后刚刚刷新

如何解决我的MVVM Room recyclerview杀死应用后刚刚刷新

MainActivity显示一个recyclerview以及一个浮动操作按钮，该意图用于AddActivity，我可以在其中将数据存储到房间数据库中，但是当我保存新数据时，只有在我杀死了应用程序并重新打开，它会显示添加的新数据，不支持livedata观察并注意更改？

主要活动

class MainActivity : AppCompatActivity() {

    private lateinit var binding:ActivityMainBinding
    private lateinit var clienteviewmodel : Clienteviewmodel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this,R.layout.activity_main)

        val dao = ClienteDataBase.getInstance(application).clienteDAO
        val repository = ClienteRespository(dao)

        val factory = ClienteviewmodelFactory(repository)

        clienteviewmodel = viewmodelProvider(this,factory).get(Clienteviewmodel::class.java)
        binding.viewmodel = clienteviewmodel
     binding.lifecycleOwner = this

        displayRecyclerview()

       val fab: View = findViewById(R.id.fab)
        fab.setonClickListener { view ->
            Snackbar.make(view,"Here's a Snackbar",Snackbar.LENGTH_LONG)
                .setAction("Action",null)
                .show()

            val intent = Intent(this@MainActivity,NewItemActivity::class.java)

            startActivity(intent)
        }

    }

    private fun displayRecyclerview(){
        binding.clientesRecyclerView.layoutManager = linearlayoutmanager(this)

        displayListaClientes()

    }

    private fun displayListaClientes(){

        clienteviewmodel.cliente.observe(this,Observer {

            Log.i("mytag",it.toString() )

            binding.clientesRecyclerView.adapter = RecyclerViewAdapter(it)


        })
    }



}

添加数据的活动

class NewItemActivity：AppCompatActivity（）{

private lateinit var binding:ActivityNewItembinding
private lateinit var clienteviewmodel : Clienteviewmodel

companion object {
    val ITEM_NAME = "new_item_activity.item_name"
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = DataBindingUtil.setContentView(this,R.layout.activity_new_item)

    val dao = ClienteDataBase.getInstance(application).clienteDAO

    val repository = ClienteRespository(dao)

    val factory = ClienteviewmodelFactory(repository)

    clienteviewmodel = viewmodelProvider(this,factory).get(Clienteviewmodel::class.java)
    binding.viewmodel = clienteviewmodel
    binding.lifecycleOwner = this


}









// As an alternative to 'setCanceledOnTouchOutside(false)' method.
override fun onTouchEvent(event: MotionEvent): Boolean = true

}

viewmodel

Class Clienteviewmodel（私有val储存库：ClienteRespository）：viewmodel（），可观察{

val cliente : LiveData<List<Cliente>> = repository.cliente

@Bindable
val inputNome = mutablelivedata<String>()

@Bindable
val inputProduto = mutablelivedata<String>()

@Bindable
val inputValor = mutablelivedata<String>()

@Bindable

val saveOrupdateBtn = mutablelivedata<String>()

@Bindable

val deleteallBtn = mutablelivedata<String>()

init {
    saveOrupdateBtn.value = "Save"
    deleteallBtn.value = "Clear ALl"
}

fun saveOrUpdate() {

    val nome: String = inputNome.value!!
    val produto: String = inputProduto.value!!
    val valor: String = inputValor.value!!

    insertCliente(Cliente(0,nome,produto,valor))

    inputNome.value = null
    inputProduto.value = null
    inputValor.value = null

}


fun clearOrDelete() {

    deleteallCliente()

}


private fun insertCliente(cliente: Cliente) = viewmodelScope.launch {
    repository.insert(cliente)
}

fun upDateCliente(cliente: Cliente) = viewmodelScope.launch {

    repository.update(cliente)
}


fun deleteCliente(cliente: Cliente) = viewmodelScope.launch {

    repository.delete(cliente)
}


fun deleteallCliente() = viewmodelScope.launch {

    repository.deleteall()
}


override fun removeOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback?) {
}

override fun addOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback?) {
}

}