若显示带进度的进度条：
1 requestWindowFeature(Window.FEATURE_PROGRESS);
2 setProgressBarVisibility(true);
3 setProgress(10);
若显示不带进度的进度条：
1 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
2 setProgressBarIndeterminateVisibility(true);
原文：http://www.cnblogs.com/csxcode/p/4357344.html