activity_create_or_join.xml

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

<LinearLayout 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="match_parent"
    android:orientation="vertical"
    android:background="@color/backgroundColor">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:contentInsetStartWithNavigation="0dp"
        app:popupTheme="@style/Theme.HLSDemo"
        app:theme="@style/ToolbarColoredBackArrow"
        app:titleMarginStart="0dp"
        app:navigationIcon="@drawable/ic_back_arrow"
        app:titleTextColor="@color/white" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical">

            <LinearLayout
                android:visibility="gone"
                android:id="@+id/previewLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center">

                <androidx.cardview.widget.CardView
                    android:id="@+id/previewCard"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:backgroundTint="#616161"
                    app:cardCornerRadius="8dp"
                    app:strokeColor="#616161">

                    <live.videosdk.rtc.android.VideoView
                        android:id="@+id/joiningView"
                        android:layout_width="250dp"
                        android:layout_height="340dp" />

                    <LinearLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_horizontal|bottom"
                        android:layout_marginBottom="10dp"
                        android:orientation="horizontal">

                        <com.google.android.material.floatingactionbutton.FloatingActionButton
                            android:id="@+id/btnMic"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:src="@drawable/ic_mic_off"
                            app:backgroundTint="@color/md_red_400"
                            app:tint="@color/white" />


                        <com.google.android.material.floatingactionbutton.FloatingActionButton
                            android:id="@+id/btnWebcam"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="10dp"
                            android:src="@drawable/ic_video_camera_off"
                            app:backgroundTint="@color/md_red_400"
                            app:tint="@color/white" />

                    </LinearLayout>

                </androidx.cardview.widget.CardView>
            </LinearLayout>

            <LinearLayout
                android:id="@+id/fragContainer"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:padding="36dp" />

        </LinearLayout>

    </ScrollView>


</LinearLayout>