//懒汉式加载
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);

        if(isVisibleToUser){
            getLunBo();
//line是线性布局

 if(line!=null&&line.getChildCount()>0){
                line.removeAllViews();
                img.clear();
                point.clear();
            }
        }
    }