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硅谷新闻1--引导界面GuideActivity，1--guideactivity
1.红点切换间距
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) iv_red_point.getLayoutParams(); params.leftMargin = leftmargin; iv_red_point.setLayoutParams(params);
2.显示和隐藏按钮
3.getViewTreeObserver()
http://www.cnblogs.com/wangying222/p/5267923.html