Added Initial Project structure and nested recycler view files

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 27
+    defaultConfig {
+        applicationId "io.navendra.nestedrecycler"
+        minSdkVersion 23
+        targetSdkVersion 27
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+
+    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    implementation 'com.android.support:cardview-v7:27.1.1'
+
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

app/proguard-rules.pro

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+# 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

app/src/androidTest/java/io/navendra/nestedrecycler/ExampleInstrumentedTest.kt

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+package io.navendra.nestedrecycler
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.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.getTargetContext()
+        assertEquals("io.navendra.nestedrecycler", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.navendra.nestedrecycler">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".views.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/io/navendra/nestedrecycler/models/ChildDataFactory.kt

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+package io.navendra.nestedrecycler.models
+
+import io.navendra.nestedrecycler.R
+import java.util.*
+
+object ChildDataFactory{
+
+    private val random = Random()
+
+    private val titles =  arrayListOf( "Aviator", "Now you can See me", "God Father", "Mission Impossible", "3 idiots")
+
+    private fun randomTitle() : String{
+        val index = random.nextInt(titles.size)
+        return titles[index]
+    }
+
+    private fun randomImage() : Int{
+        return R.drawable.aviator
+    }
+
+    fun getChildren(count : Int) : List<ChildModel>{
+        val children = mutableListOf<ChildModel>()
+        repeat(count){
+            val child = ChildModel(randomImage(), randomTitle())
+            children.add(child)
+        }
+        return children
+    }
+
+
+}

app/src/main/java/io/navendra/nestedrecycler/models/ChildModel.kt

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+package io.navendra.nestedrecycler.models
+
+data class ChildModel(
+        val image : Int = -1,
+        val title : String = ""
+)

app/src/main/java/io/navendra/nestedrecycler/models/ParentDataFactory.kt

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+package io.navendra.nestedrecycler.models
+
+import java.util.*
+
+object ParentDataFactory{
+    private val random = Random()
+
+    private val titles =  arrayListOf( "Now Playing", "Classic", "Comedy", "Thriller", "Action", "Horror", "TV Series")
+
+    private fun randomTitle() : String{
+        val index = random.nextInt(titles.size)
+        return titles[index]
+    }
+
+    private fun randomChildren() : List<ChildModel>{
+        return ChildDataFactory.getChildren(20)
+    }
+
+    fun getParents(count : Int) : List<ParentModel>{
+        val parents = mutableListOf<ParentModel>()
+        repeat(count){
+            val parent = ParentModel(randomTitle(), randomChildren())
+            parents.add(parent)
+        }
+        return parents
+    }
+}

app/src/main/java/io/navendra/nestedrecycler/models/ParentModel.kt

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+package io.navendra.nestedrecycler.models
+
+data class ParentModel (
+        val title : String = "",
+        val children : List<ChildModel>
+)

app/src/main/java/io/navendra/nestedrecycler/views/MainActivity.kt

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+package io.navendra.nestedrecycler.views
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import android.widget.LinearLayout
+import io.navendra.nestedrecycler.R
+import io.navendra.nestedrecycler.models.ParentDataFactory
+import io.navendra.nestedrecycler.views.adapters.ParentAdapter
+import kotlinx.android.synthetic.main.activity_main.*
+
+class MainActivity : AppCompatActivity() {
+
+    lateinit var recyclerView: RecyclerView
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        initRecycler()
+    }
+
+    private fun initRecycler(){
+        recyclerView = rv_parent
+
+        recyclerView.apply {
+            layoutManager = LinearLayoutManager(this@MainActivity, LinearLayout.VERTICAL, false)
+            adapter = ParentAdapter(ParentDataFactory.getParents(40))
+        }
+
+    }
+}

app/src/main/java/io/navendra/nestedrecycler/views/adapters/ChildAdapter.kt

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+package io.navendra.nestedrecycler.views.adapters
+
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.TextView
+import io.navendra.nestedrecycler.R
+import io.navendra.nestedrecycler.models.ChildModel
+import kotlinx.android.synthetic.main.child_recycler.view.*
+
+class ChildAdapter(private val children : List<ChildModel>) : RecyclerView.Adapter<ChildAdapter.ViewHolder>(){
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val v =  LayoutInflater.from(parent.context).inflate(R.layout.child_recycler,parent,false)
+        return ViewHolder(v)
+    }
+
+    override fun getItemCount(): Int {
+        return children.size
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val child = children[position]
+        holder.imageView.setImageResource(child.image)
+        holder.textView.text = child.title
+    }
+
+
+    inner class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView){
+
+        val textView : TextView = itemView.child_textView
+        val imageView: ImageView = itemView.child_imageView
+
+    }
+}

app/src/main/java/io/navendra/nestedrecycler/views/adapters/ParentAdapter.kt

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+package io.navendra.nestedrecycler.views.adapters
+
+import android.support.v7.widget.LinearLayoutManager
+import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.LinearLayout
+import android.widget.TextView
+import io.navendra.nestedrecycler.R
+import io.navendra.nestedrecycler.models.ParentModel
+import kotlinx.android.synthetic.main.parent_recycler.view.*
+
+class ParentAdapter(private val parents : List<ParentModel>) : RecyclerView.Adapter<ParentAdapter.ViewHolder>(){
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val v = LayoutInflater.from(parent.context).inflate(R.layout.parent_recycler,parent,false)
+        return ViewHolder(v)
+    }
+
+    override fun getItemCount(): Int {
+       return parents.size
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val parent = parents[position]
+        holder.textView.text = parent.title
+        holder.recyclerView.apply {
+            layoutManager = LinearLayoutManager(holder.recyclerView.context, LinearLayout.HORIZONTAL, false)
+            adapter = ChildAdapter(parent.children)
+        }
+    }
+
+
+    inner class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView){
+        val recyclerView : RecyclerView = itemView.rv_child
+        val textView:TextView = itemView.textView
+    }
+}