导航抽屉隐藏在我的片段中

Question

我的片段存在很大问题 在第一个片段（List2）（导航抽屉）中，我有一个列表视图。但是在用户片段中，导航抽屉没有出现，请你帮我 帐户 - ＆GT; List2 - ＆gt;用户 Account.java

public class Account extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {
.........................
    public boolean onNavigationItemSelected(MenuItem item) {
        FragmentManager fm = getSupportFragmentManager();
        int id = item.getItemId();

        if (id == R.id.nav_camera) {
            fm.beginTransaction().replace(R.id.content_frame, new List1()).commit();
        } else if (id == R.id.nav_gallery) {
            fm.beginTransaction().replace(R.id.content_frame, new List2()).commit();
        } 
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
}

List2.java

    public class List2 extends Fragment implements ListView.OnItemClickListener {
..........
        @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(getActivity().getApplicationContext(), User.class);
                HashMap<String, String> map = (HashMap) parent.getItemAtPosition(position);
                String tid = map.get("name").toString();
                intent.putExtra("nom", tid);
                startActivity(intent);
            }

User.java

public class User extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootview = inflater.inflate(R.layout.fragment_user, container, false);
        Intent intent = getActivity().getIntent();
..............

}
}

但是classe用户似乎从未使用过。为什么呢？

提前致谢