android - Center a progress bar vertically -

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I have a ProgressBar inside a relative layout and some Look at the elements with others and I am unable to focus progress bar vertically. I tried android: layout_centerVertical = "true" , android: layout_gravity = "center_vertical" , android: layout_gravity = "center" , and < Code> Android: gravity = "center" but it will not work!

This is my layout: 

   & Lt; TextView android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "random number:" android: id = "@ + id / lbl" Android: visibility = "gone" /> & Lt; TextView android: Layout_width = "Wrap_content" Android: Layout_height = "Wrap_content" android: id = "@ + id / rndNum" Android: layout_toRightOf = "@ id / LBL" Android: visibility = "Gone" / & gt; & Lt; / RelativeLayout & gt; & Lt; / Scrollview & gt;  Edit : The progress bar, however, is being centered horizontally.  
  Update:  This is how the scene is being provided  Enter image details here    
 
 
  Try it this way, hope it Will help you solve the problem.   
 if If you want RelativeLayout then match_parent FrameLayout to take the form of the original layout of your scrollview and you put out the progressbar like the Side RelativeLayout below to install layout_height  
   & Lt; Android: layout_height = "wrap_content" android: id = "@ + id / rndNum" Android: layout_toRightOf = "@ id / lbl" Android: Visibility = "gone" /> & Lt; / RelativeLayout & gt; & Lt; / Scrollview & gt; & Lt; ProgressBar Android: Android: layout_heid = "wrap_content" Android: layout_gravity = "Android: Android: Progress =" Visible "Android: Android: Center" Android: Uncertain = "True" /> & lt; / FrameLayout & gt; & Lt; /android.support.v4.widget.SwipeRefreshLayout>

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