java - onNavigationItemSelected() 问题

Question

当单击任何菜单项时，没有响应，他们应该导航到目标 fragment

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        item.setChecked(true);

        int id = item.getItemId();
        switch (id) {

            case R.id.mealFragment:
                navController.navigate(R.id.mealFragment);
                break;

            case R.id.drinksFragment:
                navController.navigate(R.id.drinksFragment);
                break;

            case R.id.dessertFragment:
                navController.navigate(R.id.dessertFragment);
                break;

        }
        drawer.closeDrawer(GravityCompat.START);
        return true;

    }






// setting up on time Navigation 

private void setUpNavigation() {
    drawer = findViewById(R.id.drawer_layout);
    NavigationView navigationView = findViewById(R.id.nav_view);
    navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, drawer);
    NavigationUI.setupWithNavController(navigationView, navController);
    navigationView.setNavigationItemSelectedListener(this);

}

调用 setUpNavigation() 后。应用程序始终坚持将 mealFragment() 作为导航图上的起始目的地

Answer 1

我以编程方式将 HeaderView 添加到 NavigationView 因此我已经有了 NavigationView

我调用了navigationView.bringToFront();

这是上下文的代码 fragment :

NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view);
navigationView.bringToFront();