RxView防抖，解决多次点击问题,多次点击只产生一次请求，防抖动

        RxView.clicks(cb_all).throttleFirst(2000, TimeUnit.MICROSECONDS).subscribe(aVoid -> {
            if (cb_all.isChecked()) {
                mSelectedTicketDownInfoBeans.clear();
                if (mTicketDownInfoBeans.size() > 0){
                    mSelectedTicketDownInfoBeans.addAll(mTicketDownInfoBeans);
                }else {
                    mSelectedTicketDownInfoBeans.addAll(allTypeTickets);
                }
            } else {
                mSelectedTicketDownInfoBeans.clear();
                //allTypeTickets存储到数据库的表中

            }

            tv_selected.setText("已选" + mSelectedTicketDownInfoBeans.size() + "项");

            for (TicketDownInfoBean ticketDownInfoBean : mTicketDownInfoBeans) {
                ticketDownInfoBean.setCheck(cb_all.isChecked());
            }
            mSelectedTicketDownInfoBeans = new ArrayList(new HashSet(mSelectedTicketDownInfoBeans));
            mTicketAdapter.setList(mTicketDownInfoBeans);
            mTicketAdapter.notifyDataSetChanged();
        });