NavigationUI:如何在按下BottomNavigation项之后更改导航目标之前设置操作

// 在Activity或Fragment中获取NavController对象
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);

// 将BottomNavigationView与NavController关联起来
BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation_view);
NavigationUI.setupWithNavController(bottomNavigationView, navController);

// 设置导航项点击事件的监听器
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        // 根据选中的导航项执行相应的操作
        switch (item.getItemId()) {
            case R.id.navigation_home:
                // 执行操作...
                break;
            case R.id.navigation_dashboard:
                // 执行操作...
                break;
            case R.id.navigation_notifications:
                // 执行操作...
                break;
        }
        return true;
    }
});