如果我在我的主要活动则显示为要求这样的进度对话框预计：

If I request a progress dialog like this in my main Activity then it is displayed as expected:

          requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);  
  setProgressBarIndeterminateVisibility(true); 

但是，如果我设置的知名度，假，然后重新设置为真中，我想部署它调用的过程里，什么也不显示。移动requestWindowFeature给该过程导致异常。我应该怎么做呢？

But if I set the visibility to "false", and then reset it to "true" inside the called procedure in which I want to deploy it, nothing is displayed. Moving the requestWindowFeature to the procedure causes an exception. How should I be doing this?

推荐答案

您需要调用 requestWindowFeature（）只有一次，在的onCreate（） ，在打电话之前的setContentView（）。然后你可以使用 setProgressBarIndeterminateVisibility（TRUE | FALSE）来显示或隐藏在活动的任何地方的进度指示器（只要它当然是在UI线程上，）。

You need to call requestWindowFeature() only once, in onCreate(), before you call setContentView(). Then you can use setProgressBarIndeterminateVisibility(true|false) to show or hide the progress indicator from anywhere in the activity (as long as it is on the UI thread, of course).