SSExpandableRecyclerView

Expandable Recyclerview make it easy to integrate nested recyclerview

Features

• 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.

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Installation

1. 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
            }
        }
    }
}

2. 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>

3. 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
                .... />

4. 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>

5. 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 line

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For bugs, feature requests, and discussion please use [GitHub Issues].

License

Copyright 2021 Simform Solutions

https://github.com/SimformSolutionsPvtLtd/SSExpandableRecylerView