activity_main.xml [v13+] without Circular Seekbar

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.iptea.audio22.MainActivity"
    android:background="@drawable/loss_blur">

    <TextView
        android:id="@+id/instruction_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="@string/instruction_text"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="50dp"
        android:textColor="#ffffff"
        android:textSize="22sp"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintLeft_creator="1" />

    <SeekBar
        android:id="@+id/frequency"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="100dp"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintLeft_creator="1" />

    <com.skyfishjy.library.RippleBackground
        android:id="@+id/contents"
        app:rb_color="#fbd88f"
        app:rb_radius="50dp"
        app:rb_rippleAmount="4"
        app:rb_duration="3000"
        app:rb_scale="6"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true">
        <de.hdodenhof.circleimageview.CircleImageView
            xmlns:app="http://schemas.android.com/apk/res-auto"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_centerInParent="true"
            android:id="@+id/centerImage"
            android:src="@drawable/a1" />
    </com.skyfishjy.library.RippleBackground>

    <com.hanks.htextview.fade.FadeTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="400dp"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintLeft_creator="1"
        android:id="@+id/animatedText"
        android:textColor="#fff"
        android:textSize="22sp"
        android:fontFamily="roboto_light_italic"
        app:animationDuration="1500"/>

</RelativeLayout>