How to implement nested paging in android kotlin? - kotlin

Question

I have a recyclerview , for i using pagin 3 with coroutine live data .
but child recyclerview also have paginate data so how can i perform this nested pagination in android kotlin.

Answer 1

So , I done this with pagination for child recyclerview inside recyclerview .
Firstly of all call api for fetch dates and perform api for every date at same time when date are fetching.
so structure like this...
lateinit var adapter: WeeklyAdapter
lateinit var dayAdapter: DayDetailsPagingAdapter
private fun observeData() {
viewModel.weeklyAcquiringDetails(AcquiringVM.WEEKLY, "").observe(this){
wsWithLoader(it){
binding.rvAcquiringWeeklyDetails.adapter = WeeklyAdapter(it.data!!.data, object : WeeklyAdapter.OnPerformApi{
override fun performApi(date: String, rvMonthly: RecyclerView) {
dayAdapter = DayDetailsPagingAdapter(object : DayDetailsPagingAdapter.OnClick{
override fun onClick(result: DayAcquiring.Data) {}
})
rvMonthly.adapter = dayAdapter
lifecycleScope.launchWhenCreated {
viewModel.getDayAcquiringDetails(date).collectLatest { data ->
dayAdapter.submitData(data)
}
}
}
})
}
}
}
Weekly Adapter
class WeeklyAdapter (
val list: List<WeeklyAcquiring.Data>,
val action: OnPerformApi
) : RecyclerView.Adapter<WeeklyAdapter.ViewHolder>() {
#NonNull
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(DataBindingUtil.inflate(LayoutInflater.from(parent.context), R.layout.list_monthly, parent, false))
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val result = list[position]
holder.binding.apply {
tvDate.text = changeDateFormat(result.doctorScheduleDate,"yyyy-MM-dd","E, dd MMM yyyy")
action.performApi( result.doctorScheduleDate , rvMonthly)
}
}
override fun getItemCount(): Int {
return list.size
}
inner class ViewHolder(binding: ListMonthlyBinding) : BaseViewHolder<ListMonthlyBinding>(binding) {}
interface OnPerformApi{
fun performApi(date : String, rvMonthly: RecyclerView)
}
}
list_monthly_layout
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/tvDate"
style="#style/TVBold"
android:layout_marginTop="#dimen/_5sdp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="#dimen/_12sdp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="May 2022" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvMonthly"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/_10sdp"
app:layout_constraintEnd_toEndOf="parent"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintStart_toStartOf="parent"
tools:listitem="#layout/list_acquiring_details"
app:layout_constraintTop_toBottomOf="#+id/tvDate" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
DayDetailsPagingAdapter
class DayDetailsPagingAdapter (private val onClick: OnClick) : PagingDataAdapter<DayAcquiring.Data, DayDetailsPagingAdapter.ViewHolder>(DiffCallback()) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(ListAcquiringDetailsBinding.inflate(LayoutInflater.from(parent.context), parent, false))
}
#SuppressLint("SetTextI18n")
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val result = getItem(position)!!
holder.binding.apply {
data = result
tvName.text = result.userName
tvAmount.text = "€ ${result.amount}"
}
}
class ViewHolder(val binding: ListAcquiringDetailsBinding) : RecyclerView.ViewHolder(binding.root) {}
private class DiffCallback : DiffUtil.ItemCallback<DayAcquiring.Data>() {
override fun areItemsTheSame(
oldItem: DayAcquiring.Data,
newItem: DayAcquiring.Data
): Boolean = oldItem == newItem
override fun areContentsTheSame(
oldItem: DayAcquiring.Data,
newItem: DayAcquiring.Data
): Boolean = oldItem == newItem
}
interface OnClick {
fun onClick(result: DayAcquiring.Data )
}
}
**in viewmodel **
fun getDayAcquiringDetails( date: String ) = apiHelper.getDayAcquiringDetails( date ).cachedIn(viewModelScope)
fun weeklyAcquiringDetails( filter: String , date: String) = apiHelper.weeklyAcquiringDetails( filter , date)
hope you like this .