btnVerifyCode.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        btnVerifyCode.setEnabled(false);
        Observable.interval(0, 1, TimeUnit.SECONDS)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeOn(AndroidSchedulers.mainThread())
                .limit(31)
                .map(new Func1<Long, Long>() {
                    @Override
                    public Long call(Long aLong) {
                        return 30 - aLong;
                    }
                })
                .doOnSubscribe(new Action0() {
                    @Override
                    public void call() {
                        btnVerifyCode.setEnabled(false);
                    }
                })
                .doOnCompleted(new Action0() {
                    @Override
                    public void call() {
                        btnVerifyCode.setEnabled(true);
                        btnVerifyCode.setText("重新发送");
                    }
                })
                .subscribe(new Action1<Long>() {
                    @Override
                    public void call(Long aLong) {
                        btnVerifyCode.setText("重新发送（"+aLong + " s ）");
                    }
                }, new Action1<Throwable>() {
                    @Override
                    public void call(Throwable throwable) {
                        ToastUtils.showCustomBgToast("获取失败，错误信息：" + throwable.getMessage() + "");
                    }
                });
    }
});

/**
 * 显示自定义底部弹出PopupWindow
 *
 * @param parent            传根布局就好了
 * @param contentView       PopupWindow内容
 * @param bgColor           背景颜色(窗体变暗效果)
 * @param focusable         是否点击空白区域取消(非全屏时可以)和返回键关闭
 * @param fullScreen        是否全屏
 * @param onDismissListener 取消监听
 */
public void showBottomPopupWindow(View parent, View contentView, int bgColor, boolean focusable, boolean fullScreen, PopupWindow.OnDismissListener onDismissListener) {
    hideBottomDialog();
    AutoUtils.auto(contentView);
    popupWindow = new PopupWindow(ViewGroup.LayoutParams.MATCH_PARENT, fullScreen ? ViewGroup.LayoutParams.MATCH_PARENT : ViewGroup.LayoutParams.WRAP_CONTENT);
    popupWindow.setContentView(contentView);
    // 设置弹出窗体可点击
    popupWindow.setFocusable(focusable);
    // 设置弹出窗体的背景
    popupWindow.setBackgroundDrawable(new ColorDrawable(bgColor));
    if (onDismissListener != null) {
        popupWindow.setOnDismissListener(onDismissListener);
    }
    //设置弹出窗体显示时的动画，从底部向上弹出
    popupWindow.setAnimationStyle(R.style.ZzAnimationDialog);
    popupWindow.showAtLocation(parent, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
}
/**
 * 隐藏自定义底部弹出PopupWindow
 */
public void hideBottomDialog() {
    if (popupWindow != null) {
        popupWindow.dismiss();
        popupWindow = null;
    }
}