The first one: When the list box slides down, a lot of information will be displayed. At this time, more information needs to be displayed, then a scrolling circle will appear. The id value of the pb_loading control.
If canceled, the interface will be canceled together
The second is that when you enter the list box, the data content information will be automatically loaded, and a rolling circular progress box will pop up directly on the host surface.
The value of the id is also com.github.pockethub.android.debug:id/pb_loading, the progress box cannot be cancelled, and you can only wait.
The third is the scroll box that comes with the system. When it is at the top of the listview, this event will be called when sliding.
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