Question

如何将我的视图模型传递给不扩展活动的类我这样称呼我的视图模型：在我的 EntryAbstract 类中我哪里错了

val FrutasViewModel = ViewModelProvider.NewInstanceFactory().create(FrutasViewModel::class.java)

     FrutasViewModel.frutaData.value.forEach { item->
            itens.add(ShoppingCart
            (id=item.id,photo=item.photo,
                    name=item.name,quantidade=item.quantidade
                    ,categoria = item.categoria,descricao = item.descricao
                    ,unidade=item.unidade,kilo = item.kilo

            ))
        }

我的视图模型：

package com.example.quitanda.models

import android.util.Log
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.launch

class FrutasViewModel(
    private val frutasServices: Services,
):ViewModel() {

    private val _frutasData: MutableStateFlow<List<ShoppingCart>> = MutableStateFlow<List<ShoppingCart>>(listOf<ShoppingCart>(ShoppingCart()))
    val frutaData: StateFlow<List<ShoppingCart>>
    get() = _frutasData

    fun getFrutas(){

        viewModelScope.launch {
            try {
                val frutas = frutasServices.getFruta()
                _frutasData.value = frutas
            }catch (e:Exception){
                Log.d("Service error",e.toString())
            }
        }
    }
}

我的服务：

package com.example.quitanda.models

import retrofit2.Retrofit
import retrofit2.converter.moshi.MoshiConverterFactory
import retrofit2.http.GET


interface Services {

    @GET("/category/7")
    suspend fun  getFruta(
         //@Query("apikey")
        //apikey:String = "333b4285"
    ): List<ShoppingCart>


}

val retrofit: Retrofit = Retrofit.Builder()
    .baseUrl("http://localhost:4000/")
    .addConverterFactory(MoshiConverterFactory.create())
    .build()

val frutasServices: Services = retrofit.create(Services::class.java)

我的模型：

package com.example.quitanda.models

import android.os.Parcelable
import com.squareup.moshi.Json
import kotlinx.parcelize.Parcelize

@Parcelize
data class ShoppingCart(
    var count:Int=0,
    @field:Json(name="product_title")
    var name:String="",
    @field:Json(name="product_id")
    var id:Int=0,
    @field:Json(name="photo_photo")
    var photo:String="",
    @field:Json(name="product_quant")
    var quantidade:Int=0,
    @field:Json(name="category_name")
    var categoria:String="",
    @field:Json(name="product_description")
    var descricao:String="",
    @field:Json(name="product_price_un")
    var unidade:String="",
    @field:Json(name="product_price_kg")
    var kilo:String="",
    var tipos:String=""): Parcelable

当我尝试运行我的代码时出现以下错误有谁知道如何解决这个问题谁能帮助我不胜感激

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.quitanda, PID: 11031
    java.lang.RuntimeException: Cannot create an instance of class com.example.quitanda.models.FrutasViewModel

如何将我的视图模型传递给不扩展活动的类

0 个答案: