[android-developers] Facing problem when screen orientation changes

I am new to Android development, but in many applications which I had
developed I am facing problem when I change the orientation of screen.
Suppose I am sending data to server in that I am showing progress bar
to user (i.e. rotating circle progress bar) if user doesn't change the
screen orientation then everything is fine, after data had post to
server then another screen ( setContentView) is displayed in that user
get information that data is uploaded or downloaded successfully.

But when user change the screen orientation then I am
facing problem. When user changes screen orientation then progress bar
get disappears and user never come to know that his data is uploaded
or downloaded successfully or not?

How to solve this issue? Because in many application I am
facing this difficulty. Please Help me.Thanks in advance.

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