Java 如何使用BottomNavigationBar显示活动（无法转换为片段）？

我在展示我的活动方面有问题。我不知道如何实现从NoteActivity到HomeFragment的方法HomeFragment由BottomNavigationBar执行，而不执行NoteActivity

注意活动-

BottomNavigationBar正在执行HomeFragment和另外两个活动-

public class BottomNavigationBar extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bottom);
        BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
        bottomNav.setOnNavigationItemSelectedListener(navListener);
        bottomNav.setSelectedItemId(R.id.nav_home);
    }

    private BottomNavigationView.OnNavigationItemSelectedListener navListener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    Fragment selectedFragment = null;

                    switch (item.getItemId()) {
                        case R.id.nav_home:
                            selectedFragment = new HomeFragment();
                            break;
                        case R.id.nav_game:
                            selectedFragment = new GameFragment();
                            break;
                        case R.id.nav_user:
                            selectedFragment = new UserFragment();
                            break;
                    }

                    getSupportFragmentManager()
                            .beginTransaction()
                            .replace(R.id.fragment_container,
                                    selectedFragment)
                            .commit();

                    return true;
                }
            };
}

---

请帮忙，谢谢

实际上，您没有在任何地方使用

HomeFragment

。您仅将名称中带有

片段的布局设置为
活动的内容。然而，光是这一点并不能阻止Firestore和回收服务视图的设置工作，所以您可能只想关注这个问题，atm；e、 例如，
NoteAdapter
类等。您实际上并没有在任何地方使用
HomeFragment
。您仅将名称中带有
片段的布局设置为
活动的内容。然而，光是这一点并不能阻止Firestore和回收服务视图的设置工作，所以您可能只想关注这个问题，atm；e、 例如，
NoteAdapter
类等。
 public class HomeFragment extends Fragment {
    @Nullable
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_home, container, false); 
    }
}

public class BottomNavigationBar extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bottom);
        BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
        bottomNav.setOnNavigationItemSelectedListener(navListener);
        bottomNav.setSelectedItemId(R.id.nav_home);
    }

    private BottomNavigationView.OnNavigationItemSelectedListener navListener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    Fragment selectedFragment = null;

                    switch (item.getItemId()) {
                        case R.id.nav_home:
                            selectedFragment = new HomeFragment();
                            break;
                        case R.id.nav_game:
                            selectedFragment = new GameFragment();
                            break;
                        case R.id.nav_user:
                            selectedFragment = new UserFragment();
                            break;
                    }

                    getSupportFragmentManager()
                            .beginTransaction()
                            .replace(R.id.fragment_container,
                                    selectedFragment)
                            .commit();

                    return true;
                }
            };
}