类型不匹配：推断类型 id <未提供名称> 但应为 OnProdukItemClickListener

Question

所以我正在制作一个简单的类似市场的程序，其中数据库来自 MySQL，在这个项目中，我在 recyclerView 上添加了 onClick 函数，它将用户带到产品的详细信息

MainActivity.kt

import android.annotation.SuppressLint
import android.content.Context
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.widget.LinearLayout
import android.widget.Toast
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.androidnetworking.AndroidNetworking
import com.androidnetworking.common.Priority
import com.androidnetworking.error.ANError
import com.androidnetworking.interfaces.JSONObjectRequestListener
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.produk_list.*
import org.json.JSONObject

class MainActivity : AppCompatActivity(), OnProdukItemClickListenener {
    lateinit var produklist: ArrayList<Produk>

    @SuppressLint("WrongConstant")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        produklist = ArrayList()

        val recyclerView = findViewById(R.id.recyclerView) as RecyclerView
        recyclerView.layoutManager= LinearLayoutManager(this, LinearLayout.VERTICAL, false)
        recyclerView.addItemDecoration(DividerItemDecoration(this, 1))
        recyclerView.adapter = CustomAdapter(produklist, this)

        val produk=ArrayList<Produk>()

        AndroidNetworking.post("http://192.168.100.8/farminc/freshproduk.php")
            .setPriority(Priority.MEDIUM)
            .build()
            .getAsJSONObject(object : JSONObjectRequestListener {
                override fun onResponse(response: JSONObject) {

                    val jsonArray = response.getJSONArray("result")
                    for (i in 0 until jsonArray.length()) {
                        val jsonObject = jsonArray.getJSONObject(i)

                        var idPrdk = jsonObject.optString("id_produk").toString()
                        var imagePrdk =jsonObject.optString("image").toString()
                        var namaPrdk = jsonObject.optString("nama_produk").toString()
                        var hargaPrdk = jsonObject.optString("harga").toString()

                        produk.add(Produk("$idPrdk", "$imagePrdk", "$namaPrdk", "$hargaPrdk"))

                    }
                    recyclerView.adapter = CustomAdapter(produklist, this) ***<--problem source***
                }

                override fun onError(error: ANError) { // handle error
                }

            })
    }

    override fun onItemClick(produk: Produk, position: Int) {
        Toast.makeText(this, produk.nama_produk, Toast.LENGTH_SHORT).show()

    }
}

CustomAdapter.kt

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.produk_list.view.*

class CustomAdapter (var produk: ArrayList<Produk>, var clickListenener: OnProdukItemClickListenener):RecyclerView.Adapter<ProdukViewHolder>() {

    override fun getItemCount(): Int {
        return produk.size
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProdukViewHolder {
        val v=LayoutInflater.from(parent?.context).inflate(R.layout.produk_list, parent, false)
        return ProdukViewHolder(v)

    }

    override fun onBindViewHolder(holder: ProdukViewHolder, position: Int) {

        holder.initialize(produk.get(position), clickListenener)

    }

    interface OnProdukItemClickLictener {
        fun onItemClick(produk: Produk, position: Int)
    }

}

class ProdukViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    var imagePrdk = itemView.imagePrdk
    var namaPrdk = itemView.namaPrdk
    var hargaPrdk = itemView.hargaPrdk

    fun initialize(produk: Produk, action: OnProdukItemClickListenener) {
        imagePrdk.text = produk.image
        namaPrdk.text = produk.nama_produk
        hargaPrdk.text = produk.harga

        itemView.setOnClickListener {
            action.onItemClick(produk, adapterPosition)
        }
    }
}

interface OnProdukItemClickListenener {
    fun onItemClick(produk: Produk, position: Int)
}

Produk.kt

data class  Produk(val id: String, val image : String, val nama_produk:String, val harga: String) {
}

问题的根源是 MainActivity 中的recyclerView.adapter = CustomAdapter(produklist, this)，谢谢。

Answer 1

您在 JSONObjectRequestListener 的实现内部调用它，它不是 OnProdukItemClickListenener 类型并使用 this 关键字引用它。

你应该指向 MainActivity 因为那是OnProdukItemClickListenener的实现

像这样：

recyclerView.adapter = CustomAdapter(produklist, this@MainActivity)

这称为Qualified this expressions，用于使用 this 关键字指向特定对象。