diff --git a/expandable-recyclerview/.gitignore b/expandable-recyclerview/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/expandable-recyclerview/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/expandable-recyclerview/build.gradle b/expandable-recyclerview/build.gradle
new file mode 100644
index 0000000..2720554
--- /dev/null
+++ b/expandable-recyclerview/build.gradle
@@ -0,0 +1,51 @@
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+
+afterEvaluate {
+    generateReleaseBuildConfig.enabled = false
+}
+
+android {
+    compileSdkVersion 29
+    buildToolsVersion "29.0.2"
+
+
+    defaultConfig {
+        minSdkVersion 23
+        targetSdkVersion 29
+        versionCode 1
+        versionName "0.0.1-alpha01"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles 'consumer-rules.pro'
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.core:core-ktx:1.1.0'
+    implementation "androidx.recyclerview:recyclerview:1.1.0"
+    implementation "com.github.adriankuta:tree-structure:1.1.0"
+
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}
+
+ext {
+    PUBLISH_GROUP_ID = 'com.github.adriankuta'
+    PUBLISH_ARTIFACT_ID = 'expandable-recyclerView'
+    PUBLISH_VERSION = android.defaultConfig.versionName
+}
+
+apply from: "${rootProject.projectDir}/scripts/publish-mavencentral.gradle"
diff --git a/expandable-recyclerview/consumer-rules.pro b/expandable-recyclerview/consumer-rules.pro
new file mode 100644
index 0000000..e69de29
diff --git a/expandable-recyclerview/proguard-rules.pro b/expandable-recyclerview/proguard-rules.pro
new file mode 100644
index 0000000..f1b4245
--- /dev/null
+++ b/expandable-recyclerview/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/expandable-recyclerview/src/androidTest/java/com/github/adriankuta/expandable_recyclerview/ExampleInstrumentedTest.kt b/expandable-recyclerview/src/androidTest/java/com/github/adriankuta/expandable_recyclerview/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..77d99f3
--- /dev/null
+++ b/expandable-recyclerview/src/androidTest/java/com/github/adriankuta/expandable_recyclerview/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.github.adriankuta.expandable_recyclerview.test", appContext.packageName)
+    }
+}
diff --git a/expandable-recyclerview/src/main/AndroidManifest.xml b/expandable-recyclerview/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..7a24aac
--- /dev/null
+++ b/expandable-recyclerview/src/main/AndroidManifest.xml
@@ -0,0 +1,2 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.github.adriankuta.expandable_recyclerview" />
diff --git a/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableGroup.kt b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableGroup.kt
new file mode 100644
index 0000000..2868799
--- /dev/null
+++ b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableGroup.kt
@@ -0,0 +1,19 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import com.github.adriankuta.datastructure.tree.TreeNode
+
+open class ExpandableGroup<T>(value: T) : TreeNode<T>(value) {
+
+    private var _isExpanded = false
+    val isExpanded: Boolean
+        get() = _isExpanded
+
+
+    open fun expand() {
+        _isExpanded = true
+    }
+
+    open fun collapse() {
+        _isExpanded = false
+    }
+}
\ No newline at end of file
diff --git a/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableRecyclerView.kt b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableRecyclerView.kt
new file mode 100644
index 0000000..1d58455
--- /dev/null
+++ b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/ExpandableRecyclerView.kt
@@ -0,0 +1,12 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.recyclerview.widget.RecyclerView
+
+class ExpandableRecyclerView @JvmOverloads constructor(
+    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : RecyclerView(context, attrs, defStyleAttr) {
+
+
+}
\ No newline at end of file
diff --git a/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/MultilevelRecyclerViewAdapter.kt b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/MultilevelRecyclerViewAdapter.kt
new file mode 100644
index 0000000..db89541
--- /dev/null
+++ b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/MultilevelRecyclerViewAdapter.kt
@@ -0,0 +1,26 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+abstract class MultilevelRecyclerViewAdapter<T, VH: RecyclerView.ViewHolder>: RecyclerView.Adapter<VH>() {
+
+    abstract fun getExpandableGroups(): ExpandableGroup<T>
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VH {
+        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+
+    override fun getItemCount(): Int {
+        getExpandableGroups().toList()
+        return getExpandableGroups().nodeCount()
+    }
+
+    override fun onBindViewHolder(holder: VH, position: Int) {
+        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+
+    override fun getItemViewType(position: Int): Int {
+        return super.getItemViewType(position)
+    }
+}
\ No newline at end of file
diff --git a/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/Temp.java b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/Temp.java
new file mode 100644
index 0000000..b37f623
--- /dev/null
+++ b/expandable-recyclerview/src/main/java/com/github/adriankuta/expandable_recyclerview/Temp.java
@@ -0,0 +1,9 @@
+package com.github.adriankuta.expandable_recyclerview;
+
+public class Temp {
+
+    public static void main(String[] args) {
+        ExpandableGroup<String> group = new ExpandableGroup<>("");
+
+    }
+}
diff --git a/expandable-recyclerview/src/main/res/values/strings.xml b/expandable-recyclerview/src/main/res/values/strings.xml
new file mode 100644
index 0000000..ab1f7fe
--- /dev/null
+++ b/expandable-recyclerview/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Expandable RecyclerView</string>
+</resources>
diff --git a/expandable-recyclerview/src/test/java/com/github/adriankuta/expandable_recyclerview/ExampleUnitTest.kt b/expandable-recyclerview/src/test/java/com/github/adriankuta/expandable_recyclerview/ExampleUnitTest.kt
new file mode 100644
index 0000000..a4b6b0f
--- /dev/null
+++ b/expandable-recyclerview/src/test/java/com/github/adriankuta/expandable_recyclerview/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package com.github.adriankuta.expandable_recyclerview
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}