title: ProgressBar till JSONParser return data
body: <p>My app using TabView to show data. One of the TabActivity is corresponding with JSONArray, and one of them is a GoogleMap. When I click on one of them, the app stops for a few seconds and then shows the content. So I have question - how to make it starting instantly with ProgressBar, and when the data were loaded it would start the content of activity. I just can't get how to use ProgressBar(this spinning thing) at all.</p>
  
  <p>Thanks in advance.</p>