Basic Chat Kotlin Template

activity_chat.xml

androidx.recyclerview.widget.RecyclerView
                android:id="@+id/recycler_view_chat"

                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />

build.gradle

implementation 'com.google.android.material:material:1.0.0'

chat.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_chat)

    val adapter = GroupAdapter<ViewHolder>()
    adapter.add(ChatFromItem())
    adapter.add(ChatFromItem())
    adapter.add(ChatToItem())
    adapter.add(ChatFromItem())
    recycler_view_chat.adapter = adapter

}

inner class ChatFromItem(): Item<ViewHolder>(){
    override fun getLayout(): Int {
        return R.layout.row_chat_from
    }

    override fun bind(viewHolder: ViewHolder, position: Int) {

    }

}

inner class ChatToItem(): Item<ViewHolder>(){
    override fun getLayout(): Int {
        return R.layout.row_chat_to
    }

    override fun bind(viewHolder: ViewHolder, position: Int) {

    }

}

row_chat_from.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <!--
        // Right side alignment attribute
        android:layout_alignParentRight="true"
    -->
    <com.google.android.material.card.MaterialCardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardElevation="0dp"
        app:cardBackgroundColor="@color/colorPrimaryDark"
        app:cardCornerRadius="10dp"
        app:contentPadding="15dp"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hi man what's up?"
            android:textColor="@android:color/white"/>


    </com.google.android.material.card.MaterialCardView>

</RelativeLayout>

row_chat_to.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <!--
        // Right side alignment attribute
        android:layout_alignParentRight="true"
    -->
    <com.google.android.material.card.MaterialCardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardElevation="0dp"
        app:cardBackgroundColor="@android:color/darker_gray"
        app:cardCornerRadius="10dp"
        app:contentPadding="15dp"
        android:layout_alignParentRight="true"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hi man what's up?"
            android:textColor="@android:color/black"/>


    </com.google.android.material.card.MaterialCardView>

</RelativeLayout>