How to implement getItemViewType function in expandable recyclerview to handle position of layout

Question

In the Normal recycler view, if we use getItemViewType that helps us to handle position layout likely if your recycler view binding the same layout after scroll that function helps us to tackle that problem.

In my case I'm using expandable recycler view you can easily find what is expandable recycler view on google Here is the code that causes an error to view the right view on screen.

so problem is when i scroll checkbox automatic checked.

Screen record of app

Category Adapter class:

class CategoryAdapter(
var context: Context? = null,
onFilterClickListener: OnFilterClickListener) :
ExpandableRecyclerAdapter<CategoryAdapter.CategoryViewHolder, CategoryAdapter.CategoryListViewHolder>() {
var listener: OnFilterClickListener = onFilterClickListener

interface OnFilterClickListener {
    fun onChildClickListener(childListItem: CategoryList, checked: Boolean)
}

override fun onCreateParentViewHolder(
    parentViewGroup: ViewGroup
): CategoryViewHolder {
    val view: View = LayoutInflater.from(parentViewGroup.context)
        .inflate(R.layout.main_ctg_item, parentViewGroup, false)
    return CategoryViewHolder(view)
}

override fun onCreateChildViewHolder(parentViewGroup: ViewGroup): CategoryListViewHolder {
    val viewChild = LayoutInflater.from(parentViewGroup.context)
        .inflate(R.layout.sub_ctg_item, parentViewGroup, false)
    return CategoryListViewHolder(viewChild)
}

override fun onBindParentViewHolder(
    parentViewHolder: CategoryViewHolder,
    position: Int,
    parentListItem: ParentListItem
) {
    val data = parentListItem as Category
    parentViewHolder.bind(data)
}

override fun onBindChildViewHolder(
    childViewHolder: CategoryListViewHolder,
    position: Int,
    childListItem: Any
) {
    getItemViewType(0)
    val data = childListItem as CategoryList
    childViewHolder.bind(data)
}

inner class CategoryViewHolder(itemView: View) : ParentViewHolder(itemView) {
    private lateinit var animation: RotateAnimation
    var titleSelected: String = ""
    fun bind(category: Category) {
        itemView.findViewById<TextView>(R.id.GroupTv).text = category.name
    }

    override fun onExpansionToggled(expanded: Boolean) {
        super.onExpansionToggled(expanded)
        Log.i("LOGGG", titleSelected)
        animation = if (expanded)
            RotateAnimation(
                180f,
                0f,
                RotateAnimation.RELATIVE_TO_SELF,
                0.5f,
                RotateAnimation.RELATIVE_TO_SELF,
                0.5f
            )
        else
            RotateAnimation(
                -1 * 180f,
                0f,
                RotateAnimation.RELATIVE_TO_SELF,
                0.5f,
                RotateAnimation.RELATIVE_TO_SELF,
                0.5f
            )
        animation.duration = 200
        animation.fillAfter = true
        itemView.findViewById<ImageView>(R.id.btnExpand).startAnimation(animation)
        titleSelected = itemView.findViewById<TextView>(R.id.GroupTv).text.toString()
        Log.i("LOGGG", titleSelected)
    }

    override fun setExpanded(expanded: Boolean) {
        super.setExpanded(expanded)
        if (expanded) itemView.findViewById<ImageView>(R.id.btnExpand).rotation = 180f
        else itemView.findViewById<ImageView>(R.id.btnExpand).rotation = 0f
    }
}

inner class CategoryListViewHolder(view: View) : ChildViewHolder(view) {
    fun bind(categoryList: CategoryList) {
        itemView.findViewById<CheckBox>(R.id.filterTv).text = categoryList.name
        itemView.findViewById<CheckBox>(R.id.filterTv).tag = position
        itemView.findViewById<CheckBox>(R.id.filterTv).setOnClickListener(View.OnClickListener {
            listener.onChildClickListener(
                categoryList,
                itemView.findViewById<CheckBox>(R.id.filterTv).isChecked
            )
            Toast.makeText(itemView.context, categoryList.name, Toast.LENGTH_SHORT).show()
        })
    }
}}

CategoryList Class:

data class CategoryList(val name: String, val id: String,val title : String)

Category class:

data class Category(val name: String, val itemList: List<CategoryList>) : ParentListItem {
override fun getChildItemList(): List<*> = itemList

override fun isInitiallyExpanded(): Boolean = false}

How to implement getItemViewType function in expandable recyclerview to handle position of layout

0 Answers0