NewPipe/app/src/main/res/layout/activity_background_player.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="org.schabi.newpipe.player.BackgroundPlayerActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:layout_weight="1"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:title="@string/app_name"/>

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/play_queue"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/appbar"
        android:layout_above="@+id/metadata"
        android:scrollbars="vertical"
        app:layoutManager="LinearLayoutManager"
        tools:listitem="@layout/play_queue_item"/>

    <LinearLayout
        android:id="@+id/metadata"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/progress_bar"
        android:orientation="vertical"
        android:padding="8dp"
        tools:ignore="RtlHardcoded,RtlSymmetry">

        <TextView
            android:id="@+id/song_name"
            style="@android:style/TextAppearance.StatusBar.EventContent.Title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:maxLines="2"
            android:textSize="14sp"
            android:textColor="?attr/colorAccent"
            tools:text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis nec aliquam augue, eget cursus est. Ut id tristique enim, ut scelerisque tellus. Sed ultricies ipsum non mauris ultricies, commodo malesuada velit porta."/>

        <TextView
            android:id="@+id/artist_name"
            style="@android:style/TextAppearance.StatusBar.EventContent"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ellipsize="end"
            android:maxLines="1"
            android:textSize="12sp"
            tools:text="Duis posuere arcu condimentum lobortis mattis."/>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/playback_controls"
        android:gravity="center"
        android:orientation="horizontal"
        android:paddingLeft="16dp"
        android:paddingRight="16dp">

        <TextView
            android:id="@+id/current_time"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:minHeight="40dp"
            android:text="-:--:--"
            android:textColor="?attr/colorAccent"
            tools:ignore="HardcodedText"
            tools:text="1:06:29"/>


        <android.support.v7.widget.AppCompatSeekBar
            android:id="@+id/seek_bar"
            style="@style/Widget.AppCompat.SeekBar"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:paddingBottom="4dp"
            android:paddingTop="8dp"
            tools:progress="25"
            tools:secondaryProgress="50"/>

        <TextView
            android:id="@+id/end_time"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="-:--:--"
            android:textColor="?attr/colorAccent"
            tools:ignore="HardcodedText"
            tools:text="1:23:49"/>
    </LinearLayout>

    <RelativeLayout
        android:id="@+id/playback_controls"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:paddingTop="10dp"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal"
        android:background="@drawable/player_controls_bg"
        tools:ignore="RtlHardcoded">

        <ImageButton
            android:id="@+id/control_repeat"
            android:layout_width="25dp"
            android:layout_height="25dp"
            android:layout_toLeftOf="@+id/control_backward"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:background="#00000000"
            android:clickable="true"
            android:focusable="true"
            android:scaleType="fitXY"
            android:src="@drawable/ic_repeat_white"
            tools:ignore="ContentDescription"/>

        <ImageButton
            android:id="@+id/control_backward"
            android:layout_width="40dp"
            android:layout_height="match_parent"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:layout_toLeftOf="@+id/control_play_pause"
            android:background="#00000000"
            android:clickable="true"
            android:focusable="true"
            android:padding="2dp"
            android:scaleType="fitCenter"
            android:src="@drawable/ic_action_av_fast_rewind"
            tools:ignore="ContentDescription"/>

        <ImageButton
            android:id="@+id/control_play_pause"
            android:layout_width="50dp"
            android:layout_height="match_parent"
            android:layout_centerVertical="true"
            android:layout_centerHorizontal="true"
            android:layout_centerInParent="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:background="#00000000"
            android:padding="2dp"
            android:clickable="true"
            android:focusable="true"
            android:scaleType="fitCenter"
            android:src="@drawable/ic_pause_white"
            tools:ignore="ContentDescription"/>

        <ImageButton
            android:id="@+id/control_forward"
            android:layout_width="40dp"
            android:layout_height="match_parent"
            android:layout_centerVertical="true"
            android:layout_marginRight="5dp"
            android:layout_toRightOf="@+id/control_play_pause"
            android:background="#00000000"
            android:clickable="true"
            android:focusable="true"
            android:padding="2dp"
            android:scaleType="fitCenter"
            android:src="@drawable/ic_action_av_fast_forward"
            tools:ignore="ContentDescription"/>

        <ImageButton
            android:id="@+id/control_shuffle"
            android:layout_width="25dp"
            android:layout_height="25dp"
            android:layout_toRightOf="@+id/control_forward"
            android:layout_centerVertical="true"
            android:layout_marginRight="5dp"
            android:background="#00000000"
            android:clickable="true"
            android:focusable="true"
            android:scaleType="fitXY"
            android:src="@drawable/ic_palette_white_24dp"
            tools:ignore="ContentDescription"/>
    </RelativeLayout>

</RelativeLayout>