Android ViewPager切换页面点击触发不了focus问题

viewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
            @Override
            public void onPageSelected(int position) {
                // 页面选中时执行操作
                BottomNavigationView navView = findViewById(R.id.nav_view);
                Log.i(TAG, "onPageSelected: " + position);
                navView.getMenu().getItem(position).setChecked(true);
                MainActivity activity = MainActivity.this;
                activity.setTitle(navView.getMenu().getItem(position).getTitle());
                // 手动请求焦点
                // 通过FragmentStateAdapter获取当前Fragment,处理第一次没有焦点需要连点两次问题
                Fragment currentFragment = getSupportFragmentManager().findFragmentByTag("f" + position);
                if (currentFragment != null) {
                    View currentFragmentView = currentFragment.getView();
                    if (currentFragmentView != null) {
                        // 手动请求焦点
                        view.requestFocus();
                    }
                }
            }
        });