显示在标题上的进度条

若显示带进度的进度条：

requestWindowFeature(Window.FEATURE_PROGRESS);

setProgressBarVisibility(true);

setProgress(10); 

若显示不带进度的进度条：

1 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

2 setProgressBarIndeterminateVisibility(true);