使用循环将 arrayList 添加到 HashMap [kotlin 代码]

如何解决使用循环将 arrayList 添加到 HashMap [kotlin 代码]

我正在尝试将 itemList 作为从其他函数获取的数组，并将其放入哈希映射中。循环结束后，我尝试打印错误的内容。

class ExpandableItemClass : AppCompatActivity() {
    private var expandablelistadapter: ExpandableListViewAdapter? = null
    private lateinit var titleList : List<String>   
    private lateinit var myHasMap: HashMap<String,List<String>>  
    private var itemList : ArrayList<String> ? = null


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_pobitrota)

        titleList = ArrayList()
        myHasMap = HashMap()
        itemList = ArrayList()


        getAllTitles()

        expandablelistadapter = ExpandableListViewAdapter(this@PobitrotaActivity,titleList,myHasMap)
        pobitrota_recyclerListView.setAdapter(expandablelistadapter)


    }



    private fun getAllTitles() {
        var pRef = FirebaseDatabase.getInstance().reference.child("Titles")
        pRef.addValueEventListener(object : ValueEventListener{
            override fun onCancelled(error: DatabaseError) {

            }
            override fun onDataChange(snapshot: DataSnapshot) {
                if(snapshot.exists()){
                    (chapterList as ArrayList<String>).clear()
                    for (item in snapshot.children){
                        var subItem = item.getValue(Title::class.java)
                        if(subItem!!.getMainTitleId().equals("-M_FyZJbyXf3fLFyEuiT")){
                            (titleList as ArrayList<String>).add(subItem.getTitleName())

                            getAllItems(item.key!!)
                        }
                    }
                    
                }
            }
        })
    }


    private fun getAllItems(titleId: String) {
        var pRef = FirebaseDatabase.getInstance().reference.child("DropdownItems")
        pRef.addValueEventListener(object : ValueEventListener{
            override fun onCancelled(error: DatabaseError) {

            }
            override fun onDataChange(snapshot: DataSnapshot) {
                if(snapshot.exists()){
                    dropdownList!!.clear()
                    for (item in snapshot.children){
                        var stdItem = item.getValue(Item::class.java)
                        if(stdItem!!.getTitleId().equals(titleId)){
                            itemList!!.add(stdItem.getItemName())
                        }
                    }

                    while(index < titleList.size){
                        myHasMap.put(titleList[index],itemList!!)

                        break
                    }
                    index = index + 1


                    for(key in myHasMap.keys){
                        Log.d("TAG",key+" => "+myHasMap[key])
                    }

                    expandablelistadapter!!.notifyDataSetChanged()
                }
            }

        })
    }


}

结果如下：

//1st iterator:
title1 => [item1,item2,item3]

//2nd iterator:
title1 => [item4,item5]
title2 => [item4,item5]


//3rd iterator:
title1 => [item6,item7]
title2 => [item6,item7]
title3 => [item6,item7]

这是结果，它是正确的。我希望如此：

//1st iterator:
title1 => [item1,item3]

//2nd iterator:
title1 => [item1,item3]
title2 => [item4,item5]


//3rd iterator:
title1 => [item1,item5]
title3 => [item6,item7]

我猜我的问题是 hasmap 无法保存添加到 hasmap 的数据。

将数据添加到hashmap的正确方法是什么？我怎样才能获得正确的结果？

解决方法

这是如何在其他包数组中添加 arrayList 的示例

 val items = eventData.get(EVENT_PARAM_CART_ITEM) as ArrayList<Item>
 var arrayOf = arrayListOf<Bundle>()

 for ((index,item) in items.withIndex()) {
           
            val itemJeggings = Bundle().apply {
                putString(FirebaseAnalytics.Param.ITEM_ID,items[index].itemId.toString())
                putString(FirebaseAnalytics.Param.ITEM_BRAND,items[index].brand)
                putLong(FirebaseAnalytics.Param.QUANTITY,items[index].quantity?.toLong()!!)
                putString(FirebaseAnalytics.Param.CURRENCY,items[index].currency)
                putDouble(FirebaseAnalytics.Param.PRICE,items[index].price?.toDouble()!!)
            }
            arrayOf.add(itemJeggings)
        }