Android - 在进度条的中心显示文本

I have already made a horizontal progress bar and it works perfectly. I would like to display a textview or something similar right in the middle of it showing a countdown as the bar is loading. Keep in mind its not a progress dialog, progress bar resides inside an activity and shows a countdown timer. Can anyone help me out, whats the best way to do this and how can I accomplish this?I have already made a horizontal progress bar a