如何在屏幕底部显示自定义进度条 - Android

I have a AsyncTask that gathers information. While its gathering information I have a progress bar appear saying "Loading...". The problem is it appears in the center of the screen, the width doesn't do fill_parent and I want it to go to the bottom of the screen. Here is the code I use to call the progress barI have a AsyncTask that gathers information. Wh