title: Android round button with shadow
body: <p>I am new to android I have a button in my app:</p>
  
  <pre><code>&lt;Button android:elevation="10dp"
          android:id="@+id/btnAddJob"
          android:layout_width="50dp"
          android:layout_height="50dp"
          android:background="@drawable/round_btn"
          android:drawableLeft="@drawable/plus"
          android:paddingLeft="9dp"
          android:gravity="center"
          android:layout_marginLeft="300dp" /&gt;
  </code></pre>
  
  <p>and the round_btn:</p>
  
  <pre><code>&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
  &lt;item&gt;
      &lt;shape android:shape="oval" android:thickness="24dp" &gt;
          &lt;stroke android:color="@color/colorText" android:width="24dp" /&gt;
          &lt;solid android:color="@color/colorText"/&gt;
          &lt;size android:width="150dp" android:height="150dp"/&gt;
      &lt;/shape&gt;
  &lt;/item&gt;
  </code></pre>
  
  <p>
  The problem is I want it to have shadow so the button seems higher than other elements. Can anybody help please?</p>