title: Add line separator on first item of recyclerview
body: <p>How could I add a line just above of first item (10) a line?</p>
  
  <p><a href="https://i.stack.imgur.com/6nmaR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6nmaR.png" alt="enter image description here"></a></p>
  
  <p>I'm using RecyclerView and LinearLayoutManager to implement my design.</p>
  
  <p>activity_main.xml:</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;androidx.constraintlayout.widget.ConstraintLayout 
  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=".MainActivity"&gt;
  
      &lt;SeekBar
      android:id="@+id/timesTablesSeekBar"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginStart="5dp"
      android:layout_marginLeft="5dp"
      android:layout_marginTop="5dp"
      android:layout_marginEnd="5dp"
      android:layout_marginRight="5dp"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toTopOf="parent" /&gt;
  
   &lt;androidx.recyclerview.widget.RecyclerView
       android:id="@+id/recyclerView"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layout_marginTop="32dp"
       app:layout_constraintBottom_toBottomOf="parent"
       app:layout_constraintEnd_toEndOf="parent"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toTopOf="parent" /&gt;
  
  &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
  </code></pre>
  
  <p>list_layout.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/linearLayout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical"
  android:showDividers="beginning"&gt;
  
  &lt;TextView
      android:id="@+id/timeTables"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="center"
      android:text=""
      android:textSize="70px"
      android:textStyle="bold|italic" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>