title: ImageButton over action bar android
body: <p>I want imagebutton over action bar in my app like this:</p>
  
  <p><a href="https://i.stack.imgur.com/ZIalj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZIalj.png" alt="enter image description here"></a></p>
  
  <p>My xml code is:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;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"&gt;
      &lt;android.support.v7.widget.RecyclerView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          tools:context="in.yumigo.yumigovendor.ui.activity.InvoiceActivity"
          android:id="@+id/invoice_recycler_view"&gt;
      &lt;/android.support.v7.widget.RecyclerView&gt;
  
      &lt;ImageButton
          android:elevation="2200dp"
          android:id="@+id/float_calendar"
          android:background="@android:color/transparent"
          style="@style/CalendarFloating"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:src="@drawable/calendar_144"
          android:layout_alignParentRight="true" /&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>Obviously, the button is hidden under the actionbar like this:
  <a href="https://i.stack.imgur.com/mZUDY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mZUDY.png" alt="enter image description here"></a></p>
  
  <p>How to achieve it?</p>