<?xml version="1.0" encoding="utf-8"?>
  
  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent">
  
      <ProgressBar android:indeterminate="true"
                   android:layout_width="wrap_content"
                   android:layout_height="50dip"
                   android:id="@+id/com_facebook_login_activity_progress_bar"
                   android:layout_centerInParent="true"
                   android:visibility="gone"
                   android:indeterminateOnly="true"
              />
  </RelativeLayout>