如果同一数组列表中的值仍然计数为 1，如何获取 kotlin 的 arraylist<object> 中的计数值？

Question

我想获取 arrayString 的一个子项的计数值。所以我有 Arraylist ()，其中包含 {name, room_block, registration number} 让我们说值

{费萨尔, A-1, 628345}
{阿贡, A-1, 932983}
{杰弗里, B-1, 7820179}

然后我想从 Room_Block 中获取计数值，这样它将 return 该值。

房间数=2，即A-1和B-1

this is my temporary code which is false

this is my Arraylist value form

val dao = DAOTahanan()
    dao.get().addValueEventListener(object : ValueEventListener {
        @SuppressLint("NotifyDataSetChanged")
        override fun onDataChange(snapshot: DataSnapshot) {
            emps.clear()
            for (data in snapshot.children) {
                val emp = data.getValue(tahanan::class.java)
                emp!!.setkey(data.key)
                emps.add(emp)

            }
            temporay.sortWith { lhs, rhs ->
                rhs!!.name?.let {
                    lhs!!.name!!.compareTo(
                        it
                    )
                }!!
            }
                //filter jika nilai ada yang ganda
                temp.clear()
                for(item in tempora){

                    if (!temp.stream().anyMatch { t-> t?.blok_kamar == item?.blok_kamar }){

                        temp.add(item)
                    }else{
                        Log.e("Check duplikat value", "__${tempora.stream().count().toInt()}")
                    }
                }
                temp.sortWith { lhs, rhs ->
                    rhs!!.blok_kamar?.let {
                        lhs!!.blok_kamar!!.compareTo(
                            it
                        )
                    }!!
                }
                    //adapter & viewmodel cardslide
                adap = adaptercardslide_levelsdua(context!!, tempora)
                rec!!.layoutManager = LinearLayoutManager(context!!, LinearLayoutManager.HORIZONTAL, false)
                rec!!.adapter = adap
                adap?.setItems(temp)

这是我获取数据的代码 Arraylist() 这是我在适配器回收视图中的代码：

    package com.example.testing.model

import android.content.Context
import android.content.Intent
import android.graphics.Typeface
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.core.content.res.ResourcesCompat
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.testing.Dashboard.detail.Ac_detail_tahanan
import com.example.testing.Database.tahanan
import com.example.testing.R
import com.example.testing.adapter.RVAdapter
import java.util.stream.Collectors
import kotlin.collections.ArrayList
import androidx.localbroadcastmanager.content.LocalBroadcastManager




class adaptercardslide(private val context: Context, tempora: ArrayList<tahanan?>): RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    private val valueint = tempora
    var typeface_medium : Typeface? = null
    var typeface_bold: Typeface? = null
    var typefacesemi: Typeface? = null
    var typefacedefauld: Typeface?= null

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        val view: View = LayoutInflater.from(context).inflate(R.layout.card_item, parent, false)
        typeface_medium = ResourcesCompat.getFont(context, R.font.poppins_medium)
        typeface_bold = ResourcesCompat.getFont(context, R.font.poppins_bold)
        typefacesemi = ResourcesCompat.getFont(context, R.font.poppins_semibold)
        typefacedefauld = ResourcesCompat.getFont(context, R.font.poppins)
        return modelcardslide(view)
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val vh: modelcardslide = holder as modelcardslide
        val emp: tahanan = list[position]!!
        val count = valueint.count {
            emp.blok_kamar?.let { it1 -> it?.blok_kamar?.contains(it1) }!!
        }

        vh.nameblok.text = emp.blok_kamar
        vh.nameblok.typeface = typeface_bold

        vh.jumlahorang.text = "$count, Tahanan"
        vh.jumlahorang.typeface = typefacesemi

        vh.titlejumlah.typeface = typeface_bold

        vh.btnclik.setOnClickListener {
            val ItemName: String = vh.nameblok.text.toString()
            val intent = Intent("blok-selected")
            //            intent.putExtra("quantity",Integer.parseInt(quantity.getText().toString()));
            //            intent.putExtra("quantity",Integer.parseInt(quantity.getText().toString()));
            intent.putExtra("item", ItemName)
            LocalBroadcastManager.getInstance(context).sendBroadcast(intent)
        }
    }

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

    var list: ArrayList<tahanan?> = ArrayList<tahanan?>()
    fun setItems(emp: ArrayList<tahanan?>) {
        list.addAll(emp)
    }
}

Answer 1

我找到了答案，只需使用 startswith() 进行过滤这是我使用的代码：

var temporay = ArrayList<tahanan?>()
repeat(temp.size) {
                    temporay = (temp.stream()
                        .filter {
                            it?.blok_kamar!!.startsWith(emp.blok_kamar!![0])
                        }
                        .collect(Collectors.toList()) as ArrayList<tahanan?>)
                }

如果同一数组列表中的值仍然计数为 1，如何获取 kotlin 的 arraylist<object> 中的计数值？

how to get count value in arraylist<object> for kotlin, if value in same array list will still count 1?

arraylist

count

kotlin

recycleview