在此配置下：Window系统；IDE：Android Studio；项目管理：Gradle；JDK 8；要求：1、创建一个App项目.2、创建1个Activity作为主界面。主界面下方有四个按钮，每个按钮点击的时候切换上方的主界面（使用Fragment实现）3、在其中一个按钮点击的时候在上方主界面使用ListView显示用户列表。（列表信息和内容为用户名鲁班，司马懿并生成他们的最近登陆时间）附上代码

好的，以下是实现你要求的代码示例。

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Fragment容器 -->
    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/bottom_navigation_view" />

    <!-- 底部导航栏 -->
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimary"
        app:itemIconTint="@color/white"
        app:itemTextColor="@color/white"
        app:menu="@menu/bottom_navigation_menu" />

</RelativeLayout>

bottom_navigation_menu.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/navigation_home"
        android:icon="@drawable/ic_home"
        android:title="@string/home" />

    <item
        android:id="@+id/navigation_user"
        android:icon="@drawable/ic_user"
        android:title="@string/user" />

    <item
        android:id="@+id/navigation_settings"
        android:icon="@drawable/ic_settings"
        android:title="@string/settings" />

    <item
        android:id="@+id/navigation_about"
        android:icon="@drawable/ic_about"
        android:title="@string/about" />
</menu>

MainActivity.java：

public class MainActivity extends AppCompatActivity {

    private BottomNavigationView mBottomNavigationView;
    private FragmentManager mFragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mBottomNavigationView = findViewById(R.id.bottom_navigation_view);

        mFragmentManager = getSupportFragmentManager();

        // 默认显示首页Fragment
        mFragmentManager.beginTransaction()
                .replace(R.id.fragment_container, new HomeFragment())
                .commit();

        // 底部导航栏点击事件
        mBottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
                switch (menuItem.getItemId()) {
                    case R.id.navigation_home:
                        mFragmentManager.beginTransaction()
                                .replace(R.id.fragment_container, new HomeFragment())
                                .commit();
                        return true;
                    case R.id.navigation_user:
                        mFragmentManager.beginTransaction()
                                .replace(R.id.fragment_container, new UserFragment())
                                .commit();
                        return true;
                    case R.id.navigation_settings:
                        mFragmentManager.beginTransaction()
                                .replace(R.id.fragment_container, new SettingsFragment())
                                .commit();
                        return true;
                    case R.id.navigation_about:
                        mFragmentManager.beginTransaction()
                                .replace(R.id.fragment_container, new AboutFragment())
                                .commit();
                        return true;
                }
                return false;
            }
        });
    }
}

HomeFragment.java：

public class HomeFragment extends Fragment {

    private ListView mListView;

    public HomeFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home, container, false);

        mListView = view.findViewById(R.id.list_view);

        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        // 用户列表数据
        String[] users = {"鲁班", "司马懿"};
        String[] loginTimes = {"2021-07-01 10:00:00", "2021-07-01 11:00:00"};

        // 创建Adapter
        UserListAdapter adapter = new UserListAdapter(getContext(), users, loginTimes);

        // 设置Adapter
        mListView.setAdapter(adapter);
    }
}

UserListAdapter.java：

public class UserListAdapter extends ArrayAdapter<String> {

    private Context mContext;
    private String[] mUsers;
    private String[] mLoginTimes;

    public UserListAdapter(Context context, String[] users, String[] loginTimes) {
        super(context, R.layout.item_user, users);
        mContext = context;
        mUsers = users;
        mLoginTimes = loginTimes;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.item_user, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.mUserNameTextView = convertView.findViewById(R.id.user_name_text_view);
            viewHolder.mLoginTimeTextView = convertView.findViewById(R.id.login_time_text_view);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.mUserNameTextView.setText(mUsers[position]);
        viewHolder.mLoginTimeTextView.setText(mLoginTimes[position]);
        return convertView;
    }

    private static class ViewHolder {
        TextView mUserNameTextView;
        TextView mLoginTimeTextView;
    }
}

item_user.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/user_name_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="16sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/login_time_text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="right"
        android:textSize="14sp" />

</LinearLayout>

fragment_home.xml：

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

这样，你就可以在其中一个按钮点击时，在上方主界面使用 ListView 显示用户列表了。