[Android] Widgets: RemoteViews

1. xxx
2. Issues
• setViewVisibility
  set visibility of the specified view. But if the view is ProgressBar, you can't set its visibility with this method, otherwise, an exception will be threw out; to resolve this issue, you can add an extra a layout, such as FrameLayoout/LinearLayout, outside ProgressBar, and then set vitiblity of the outside layout.
      ...>
             .../>
  
  remoteViews.setViewVisibility(R.id.progress_layout, View.GONE);
  
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