如何在android中对某些用户隐藏某些特定类别？

// UserViewModel.java
public class UserViewModel extends ViewModel {
    private MutableLiveData<String> userRole = new MutableLiveData<>();

    public LiveData<String> getUserRole() {
        return userRole;
    }

    public void setUserRole(String role) {
        userRole.setValue(role);
    }
}

// MainActivity.java
public class MainActivity extends AppCompatActivity {
    private UserViewModel viewModel;
    private Button adminButton;

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

        adminButton = findViewById(R.id.adminButton);
        viewModel = new ViewModelProvider(this).get(UserViewModel.class);

        viewModel.getUserRole().observe(this, new Observer<String>() {
            @Override
            public void onChanged(String userRole) {
                if ("admin".equals(userRole)) {
                    adminButton.setVisibility(View.VISIBLE);
                } else {
                    adminButton.setVisibility(View.GONE);
                }
            }
        });

        // 假设用户角色为admin
        viewModel.setUserRole("admin");
    }
}