private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    //一些耗时的操作放在这里面，如getWidth  getHeight getMargin getX getY ---只有当View已经绘制到界面上了，才能获取到；所以用handler开一个子线程
                     System.out.println("每次滚到："+ mItems.get(mItems.size()-1).getX());
                    mHorizontalScrollView.smoothScrollTo((int) mItems.get(mItems.size()-1).getX(),0);

                    break;
                default:
                    break;
            }
        }
    };

 mHandler.sendEmptyMessageDelayed(1,50);