- Simple and easy to use ( no complex adapter required )
- Just extend BaseRecyclerAdapter and good to go.
- Get onClick event for parent recycler item as well child item.
- Customize where you want to collapse/expand effect.
| Expandable RecyclerView | Expandable RecyclerView | Expandable RecyclerView |
|---|---|---|
 |
 |
 |
- Extend BaseRecyclerAdapter in recycler adapter and implement below methods.
class ListAdapter : BaseRecyclerAdapter<ListDataModel, ChildDataModel>() {
// Pass parent and child model in BaseRecyclerAdapter
override fun getLayoutIdForType(): Int = R.layout.item_parent // Provide parent recycler item id
override fun getLayoutIdForChild(): Int = R.layout.item_child // Provide child recycler item id
// Click event fot parent recycler item
override fun onParentItemClick(triple: Triple<Int, Any, View>, viewDataBinding: ViewDataBinding) {
val data = triple.second as ListDataModel // Here you can get parent item data for clicked item
val position = triple.first // Get position of clicked item
val view = triple.third // Get view of clicked item
when (view.id) {
R.id.text_movie_year -> {
// Call this function where you want to expand collapse childView
expandCollapse(triple.first, viewDataBinding)
}
}
}
// Click event for child rectycler item
override fun onChildItemClicked(triple: Triple<Int, Any, View>, parentIndex: Int) {
val data = triple.second as ChildDataModel // Here you can get child item data for clicked item
val position = triple.first // Get position of clicked item
val view = triple.third // Get view of clicked item
when (view.id) {
R.id.img_download_movie -> {
// Here you can perform your action
}
}
}
}- Create variables in parent recycler item as par below and bind it as per requirement.
<data>
<variable
name="data" // Variable name should be same
type="com.expandable.recyclerview.model.ListDataModel" />
<variable
name="clickHandler" // Variable name should be same
type="android.view.View.OnClickListener" />
<variable
name="adapter" // Variable name should be same and give type BaseChildRecyclerAdapter
type="com.expandable.recyclerview.base.BaseChildRecyclerAdapter" />
<variable
name="isVisible" // Variable name should be same
type="Boolean" />
<import type="android.view.View" />
</data>- SetUp child recyclerview with adapter and visiblty like this
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/childRecycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/_8sdp"
android:visibility="@{isVisible ? View.VISIBLE : View.GONE }" // Important line
app:setAdapter="@{adapter}" //Important line
.... />- Create variables in child recycler item as par below and bind it as per requirement.
<data>
<variable
name="data" // Variable name should be same
type="com.expandable.recyclerview.model.ChildDataModel" />
<variable
name="clickHandler" // Variable name should be same
type="android.view.View.OnClickListener" />
<import type="android.view.View" />
</data>- Assign click handler where you want to recive click event
<TextView
android:id="@+id/movieTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="@{clickHandler::onClick}" /> // Important lineSupport it by joining stargazers for this repository.⭐
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