PlayerAndroid/app/src/main/res/layout/activity_equalizer.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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">

  <android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <code.name.monkey.retromusic.views.SansFontCollapsingToolbarLayout
      android:layout_width="match_parent"
      android:layout_height="96dp"
      app:collapsedTitleTextAppearance="@style/CollapsedTitleAppearance"
      app:expandedTitleGravity="top"
      app:expandedTitleMarginStart="16dp"
      app:expandedTitleMarginTop="48dp"
      app:expandedTitleTextAppearance="@style/ExpandedTitleAppearance"
      app:layout_scrollFlags="scroll|exitUntilCollapsed">

      <View
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

      <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        style="@style/Toolbar48"
        app:layout_collapseMode="pin"
        app:navigationIcon="@drawable/ic_keyboard_backspace_black_24dp">

        <android.support.v7.widget.SwitchCompat
          android:id="@+id/equalizer"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginEnd="16dp"
          android:layout_gravity="end"
          android:textAppearance="@style/TextAppearance.AppCompat.Subhead"/>
      </android.support.v7.widget.Toolbar>
    </code.name.monkey.retromusic.views.SansFontCollapsingToolbarLayout>

  </android.support.design.widget.AppBarLayout>

  <android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
      android:id="@+id/content"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical">

      <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <TextView
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_weight="0"
          android:padding="16dp"
          android:text="Select preset"
          android:textAppearance="@style/TextAppearance.AppCompat.Subhead"/>

        <Spinner
          android:id="@+id/presets"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:background="@android:color/transparent"/>
      </LinearLayout>

      <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <TextView
          android:id="@+id/bass_boost"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_weight="0"
          android:padding="16dp"
          android:text="@string/bass_boost"
          android:textAppearance="@style/TextAppearance.AppCompat.Subhead"/>

        <SeekBar
          android:id="@+id/bass_boost_strength"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:padding="16dp"
          android:max="1000"
          android:maxHeight="3dp"
          android:progressDrawable="@drawable/color_progress_seek"
          android:splitTrack="false"
          android:thumb="@drawable/switch_thumb_material"
          tools:progress="20"/>
      </LinearLayout>

      <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <TextView
          android:id="@+id/virtualizer"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_weight="0"
          android:padding="16dp"
          android:text="@string/virtualizer"
          android:textAppearance="@style/TextAppearance.AppCompat.Subhead"/>

        <SeekBar
          android:id="@+id/virtualizer_strength"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_weight="1"
          android:padding="16dp"
          android:max="1000"
          android:maxHeight="3dp"
          android:progressDrawable="@drawable/color_progress_seek"
          android:splitTrack="false"
          android:thumb="@drawable/switch_thumb_material"
          tools:progress="20"/>
      </LinearLayout>

      <LinearLayout
        android:id="@+id/bands"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingStart="8dp"
        android:paddingEnd="8dp"
        android:orientation="vertical"/>

      <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="16dp"
        android:text="*Warning: It's alpha version. We don't recommend to use Equalizer, We believe without using Equalizer songs has better sound quality."/>
    </LinearLayout>
  </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>