在单击某个子recyclerview的项目时，同时更改该项目，所有子recyclerView的项目都会更改

Question

我正在使用嵌套的recyclerView。根据业务逻辑，首先我必须调用一个API，该API提取了“父级回收者”视图中显示的项目列表。此后，如果用户单击父回收者视图的任何项目，则调用另一个API，该API会获取子项目列表，并且我必须在单击位置的父回收器的内部回收者视图中显示项目列表。视图。

我成功实现了在父回收者视图中显示项目以及在单击位置嵌套回收者视图中显示子项目。

但是我面临的问题是，当我单击父回收者视图的任何特定项目时，所有其他嵌套的回收者视图的项目都会随着新填充的子项目值而发生变化。

如何解决此问题？这是示例代码

main_item.xml

<?xml version="1.0" encoding="utf-8"?>

<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <com.google.android.material.card.MaterialCardView
        style="@style/CardViewStyle"
        android:id="@+id/chapter_layout"
        android:layout_width="match_parent">

            <com.google.android.material.textview.MaterialTextView
                android:id="@+id/chapter_name_text_view"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"/>

            <com.google.android.material.textview.MaterialTextView
                android:id="@+id/header_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"/>   

    </com.google.android.material.card.MaterialCardView>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/chapter_topic_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        tools:itemCount="3"
        tools:listitem="@layout/item_main" />

</androidx.appcompat.widget.LinearLayoutCompat>

MainItemViewHolder.kt

class MainItemViewHolder(val view: View) :  RecyclerView.ViewHolder(view) {

    fun bind(item: SpecificChapter, onClick: (SpecificChapter, Int) -> Unit) {
        with(view) {
            chapter_name_text_view.text = "Chapter "+ item.no
            header_text_view.text = item.name

            chapter_layout.setOnClickListener { onClick(item, bindingAdapterPosition) }
        }
    }
}

MainItemAdapter.kt

class MainItemAdapter(
    val onClick: (SpecificChapter, Int) -> Unit
) : ListAdapter<SpecificChapter, MainItemViewHolder>(DIFF_CALLBACK) {

    companion object {
        private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<SpecificChapter>() {
            override fun areItemsTheSame(old: SpecificChapter, aNew: SpecificChapter) = (old.id == aNew.id)
            override fun areContentsTheSame(old: SpecificChapter, aNew: SpecificChapter) = (old == aNew)
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MainItemViewHolder {
        return MainItemViewHolder(parent.inflate(R.layout.main_item))
    }

    override fun onBindViewHolder(holder: MainItemViewHolder, position: Int) {
        holder.bind(getItem(position)!!, onClick)
    }

}

sub_item.xml

<?xml version="1.0" encoding="utf-8"?>

<com.google.android.material.card.MaterialCardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

        <com.google.android.material.textview.MaterialTextView
            android:id="@+id/chapter_topic_text_view"
            android:layout_width="0dp"
            android:layout_height="wrap_content" />

</com.google.android.material.card.MaterialCardView>

SubItemViewHolder.kt

class SubItemViewHolder(val view: View) : RecyclerView.ViewHolder(view) {

    fun bind(item: SpecificTopic, onClick: (SpecificTopic) -> Unit) {
        with(view) {
            chapter_topic_text_view.text = item.name
            chapter_topic_layout.setOnClickListener { onClick(item) }
        }
    }
}

SubItemAdapter.kt

class SubItemAdapter(
    val onClick: (SpecificTopic) -> Unit
) : ListAdapter<SpecificTopic, SubItemViewHolder>(DIFF_CALLBACK) {

    companion object {
        private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<SpecificTopic>() {
            override fun areItemsTheSame(old: SpecificTopic, aNew: SpecificTopic) = (old.id == aNew.id)
            override fun areContentsTheSame(old: SpecificTopic, aNew: SpecificTopic) = (old == aNew)
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SubItemViewHolder {
        return SubItemViewHolder(parent.inflate(R.layout.sub_item))
    }

    override fun onBindViewHolder(holder: SpecificTopicViewHolder, position: Int) {
        holder.bind(getItem(position)!!, onClick)
    }

}

activity_chapter.xml

<?xml version="1.0" encoding="utf-8"?>

<androidx.appcompat.widget.LinearLayoutCompat
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/chapter_recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            tools:listitem="@layout/main_item"/>

</androidx.appcompat.widget.LinearLayoutCompat>

ChapterActivity.kt

class ChapterActivity : BaseActivity<ChapterViewModel>() {

    var chapterPosition = 0

    private val mainItemAdapter: MainItemAdapter by lazy {
        MainItemAdapter { specificChapter, position ->
            // sub item Api call when clicked specific item. response is viewmodel.allTopics
            chapterPosition = position
            specificChapter.id?.let { viewModel.getChapterWiseTopics(it) }
        }
    }

    private val subItemAdapter: SubItemAdapter by lazy {
        SubItemAdapter {

        }
    }

    override fun onResume() {
        super.onResume()
        // Main item Api call. response is viewmodel.allChapters
        viewModel.getChapters("subject_code")
    }

    override fun observeLiveData() {
        // showing Main item in parent recyclerView
        observe(viewModel.allChapters) {
            val chapterList = ArrayList<SpecificChapter>()
            chapterList.add(SpecificChapter(...))

            chapter_recycler_view.adapter = mainItemAdapter
            mainItemAdapter.submitList(chapterList)
            chapter_recycler_view.setItemViewCacheSize(chapterList.size)
        }

        // showing sub item in nested recyclerView
        observe(viewModel.allTopics) {
            val topicList = ArrayList<SpecificTopic>()
            topicList.add(SpecificTopic(...))

            with((chapter_recycler_view.findViewHolderForAdapterPosition(chapterPosition) as MainItemViewHolder).itemView) {

                this.chapter_topic_recycler_view.adapter = subItemAdapter
                subItemAdapter.submitList(topicList)
            }
        }
    }
}