问题

/*****这里是我的列表适配器的部分*****/

class CurrencyMenuAdapter(
    var viewModel: MainViewModel,
    var currencyList: ObservableList<CurrencyRoomItem>
) : ObservableRecyclerViewAdapter<CurrencyRoomItem, BaseViewHolder<CurrencyRoomItem>>(currencyList) {
    private val TAG = "CurrencyMenuAdapter"
    private val model = MainViewModel()

    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): BaseViewHolder<CurrencyRoomItem> {
        Log.e(TAG, "onCreateViewHolder: 1")
        return Holder(
            ItemcurrencymenuBinding.inflate(
                LayoutInflater.from(parent.context),
                parent,
                false
            )
        )
    }

    override fun onBindViewHolder(
        holder: BaseViewHolder<CurrencyRoomItem>,
        position: Int
    ) {
        Log.e(TAG, "onCreateViewHolder: 1")
        holder.bind(currencyList[position])
    }

    inner class Holder(private val binding: ItemcurrencymenuBinding) :
        BaseViewHolder<CurrencyRoomItem>(binding.root) {
        override fun bind(item: CurrencyRoomItem) {
            binding.item = item
            binding.btnCurrency.setOnClickListener{
                viewModel.goToRoom(item.id!!)
                Paper.book().write(Const.SAVE_ID, item.id)
            }
        }
    }
}
/*********************************************************************************************/


/*****这里是ViewModel部分*****/

class MainViewModel : BaseViewModel<MainNavigator>() {
    var firstName = ObservableField<String>()
    var lastName = ObservableField<String>()
    var userEmail = ObservableField<String>()
    var phoneNumber = ObservableField<String>()
    var listRoom = ObservableArrayList<CurrencyRoomItem>()
    lateinit var id: String
    private var useCase = GetCurrenciesMenuUseCase()

    init {
    }

    fun goToRoom(groupId: String) {
        getNavigator()!!.town(groupId)
    }
}
/*****ViewModel部分*****/


/*****这里是Activity部分*****/

class MainActivity : BaseActivity<ActivityHomeBinding>(), MainNavigator {
    private lateinit var model: MainViewModel
    private lateinit var alertDialog: AlertDialog
    var dialog: Dialog? = null

    override fun hideLogoutDialog() {
        alertDialog.dismiss()
    }

    var loginResponse = ObservableField<LoginResponse>()

    override fun town(groupId: String) {
        startActivity(Intent(this@MainActivity, CurrencyRoomActivity::class.java))
        finish()
    }
}
/*****Activity部分*****/


/****这里是BaseViewModel部分****/

abstract class BaseViewModel<N> : ViewModel() {
    private var mCompositeDisposable: CompositeDisposable = CompositeDisposable()
    private lateinit var mNavigator: WeakReference<N>

    fun getNavigator(): N? {
        return mNavigator?.get()
    }

    fun setNavigator(navigator: N) {
        this.mNavigator = WeakReference(navigator)
    }

    override fun onCleared() {
        mCompositeDisposable.dispose()
        super.onCleared()
    }

    fun getCompositeDisposable(): CompositeDisposable {
        return mCompositeDisposable
    }
}
/****BaseViewModel部分****/


/******错误信息******/
// 这里是错误截图的链接
[Error][1]
[1]: https://i.stack.imgur.com/955oy.png
/******错误信息******/

/*****here the Adapter of my list *****/
class CurrencyMenuAdapter(
var viewModel : MainViewModel,
var currencyList: ObservableList<CurrencyRoomItem>) : ObservableRecyclerViewAdapter<CurrencyRoomItem, BaseViewHolder<CurrencyRoomItem>>(currencyList){
private val TAG = "CurrencyMenuAdapter"
private val model = MainViewModel()
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): BaseViewHolder<CurrencyRoomItem> {
Log.e(TAG, "onCreateViewHolder: 1")
return Holder(
ItemcurrencymenuBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
override fun onBindViewHolder(
holder: BaseViewHolder<CurrencyRoomItem>,
position: Int
) {
Log.e(TAG, "onCreateViewHolder: 1")
holder.bind(currencyList[position])
}
inner class Holder(private val binding:ItemcurrencymenuBinding) :
BaseViewHolder<CurrencyRoomItem>(binding.root) {
override fun bind(item: CurrencyRoomItem) {
binding.item = item
binding.btnCurrency.setOnClickListener{
viewModel.goToRoom(item.id!!)
Paper.book().write(Const.SAVE_ID, item.id)
}
}
}

var firstName = ObservableField<String>()
var lastName = ObservableField<String>()
var userEmail = ObservableField<String>()
var phoneNumber = ObservableField<String>()
var listRoom= ObservableArrayList<CurrencyRoomItem>()
lateinit var id :String
private var useCase = GetCurrenciesMenuUseCase()
init {
}
fun goToRoom(groupId:String){
getNavigator()!!.town(groupId)
}

private lateinit var model: MainViewModel
private lateinit var alertDialog: AlertDialog
var dialog: Dialog? = null
override fun hideLogoutDialog() {
alertDialog.dismiss()
}
var loginResponse = ObservableField<LoginResponse>()
override fun town(groupId: String) {
startActivity(Intent(this@MainActivity, CurrencyRoomActivity::class.java))
finish()
}

abstract class BaseViewModel<N> : ViewModel() {
private  var mCompositeDisposable: CompositeDisposable = CompositeDisposable();
private lateinit var mNavigator: WeakReference<N>
fun getNavigator(): N? {
return mNavigator?.get()
}
fun setNavigator(navigator: N) {
this.mNavigator = WeakReference(navigator)
}
override fun onCleared() {
mCompositeDisposable.dispose()
super.onCleared()
}
fun getCompositeDisposable(): CompositeDisposable {
return mCompositeDisposable
}

答案1

得分: 1

错误的意思是在 mNavigator 获得值之前就使用了它，在使用 "lateinit" 时，你“承诺”永远不会出现这种情况。

在调用 setNavigator 之前调用了 getNavigator（实际上你从未调用过 setNavigator）。

要解决这个问题，你只需在调用 getNavigator 之前调用 setNavigator。这将解决你的具体问题，但 getNavigator 和 setNavigator 似乎有点奇怪，也许考虑在构造函数中进行初始化。

编辑：

我猜你需要将 MainActivity 传递给 setNavigator，因为它扩展了 MainNavigator。在这种情况下，只需在 MainActivity 中使用 ViewModel 变量，并调用：

viewModel.setNavigator(this)

MainActivity 扩展了 MainNavigator，而 MainViewModel 扩展了 BaseViewModel，所以应该可以正常工作。

viewModel.setNavigator(this)