Expandable RecyclerView

ExpandableItemView in ScrollView:

ExpandableRecyclerView

Installation

(app) build.gradle:

implementation 'com.github.emircanpekyurek:ExpandableRecyclerView:1.0.6'

AND

(root) build.gradle:

allprojects {
    repositories {
        ..
        maven { url "https://jitpack.io" }
    }
}

or settings.gradle:

dependencyResolutionManagement {
    ..
    repositories {
        ..
        maven { url 'https://jitpack.io' }
    }
}

Usage

for collapsed attributes:

expanded attributes:

for horizontal:

Usage For ExpandableRecyclerView

Create a layout xml file with only ExpandableItemView in it. eg:custom_expandable_recycler_view

<?xml version="1.0" encoding="utf-8"?>
<com.emircan.expandablerecyclerview.ExpandableItemView
    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"
    app:animation_duration="200"
    app:collapsed_icon_tint="#787878"
    app:expanded_icon_tint="#000000"
    app:line_color="#D6D6D6"
    app:recycler_layout_manager="GridLayoutManager"
    app:recycler_padding="5dp"
    app:recycler_span_count="3"
    app:show_view_line="true"
    app:title="Custom Grid View"
    app:title_color="#000000" />
 />

add ExpandableRecyclerView to activity or fragment:

<com.emircan.expandablerecyclerview.ExpandableRecyclerView
    android:id="@+id/expandableRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:keepExpandCollapseState="true"
    app:singleExpandItem="true" /> <!--default values is true-->

use setData function:

val adapter = ... //RecyclerView adapter
val list = listOf<ExpandableItem>(ExpandableItem("Item 1", adapter))
expandableRecyclerView.setData(R.layout.custom_expandable_recycler_view, list)
//or add optional values:
val isSingleExpandItem = true //or app:singleExpandItem in xml (for single expandable)
val keepExpandCollapseState = true //or use app:keepExpandCollapseState in xml (for keep state)
expandableRecyclerView.setData(R.layout.custom_expandable_recycler_view, list, isSingleExpandItem, keepExpandCollapseState)

ExpandableItemView - Custom Attributes:

ExpandableRecyclerView - Custom Attributes: