title: Button is not getting displayed in Relative layout
body: <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@drawable/main_screen_image"
      android:paddingBottom="@dimen/activity_vertical_margin"
      tools:context=".MainActivity" &gt;
      &lt;Button
          android:id="@+id/button1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true"
          android:layout_centerHorizontal="true"
          android:background="@drawable/facebook_login_button" /&gt;
  
      &lt;Button
          android:id="@+id/button2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_below="@id/button1"
          android:layout_centerHorizontal="true"
          android:background="@drawable/have_a_look_text_image" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>Can any body please tell me why button2 is not getting displayed, I am really not able to figure it out </p>