隐藏导航抽屉的内容 - com.mikepenz：materialdrawer：5.1.6@aar

Question

我在主屏幕中使用导航抽屉并使用第三方库 com.mikepenz：materialdrawer：5.1.6@aar 来构建我的Material Drawer。我的要求是我想根据条件隐藏一些菜单项。有没有办法实现它？这就是我创建抽屉的方式。

private Drawer result = null;
 AccountHeader headerResult;

final PrimaryDrawerItem home = new PrimaryDrawerItem().withName("Home").withIdentifier(1).withIcon(GoogleMaterial.Icon.gmd_home);
        final PrimaryDrawerItem profile = new PrimaryDrawerItem().withName("Profile").withIdentifier(2).withIcon(GoogleMaterial.Icon.gmd_account);
        final PrimaryDrawerItem gallery = new PrimaryDrawerItem().withName("Gallery").withIdentifier(3).withIcon(R.drawable.ic_perm_media_black_24dp);
        final PrimaryDrawerItem recognition = new PrimaryDrawerItem().withName("Recognition").withIdentifier(4).withIcon(GoogleMaterial.Icon.gmd_face);
        final PrimaryDrawerItem maps = new PrimaryDrawerItem().withName("Maps").withIdentifier(5).withIcon(R.drawable.ic_place_black_24dp);
        final PrimaryDrawerItem tagAndLocate = new PrimaryDrawerItem().withName("Tag & Locate").withIdentifier(6).withIcon(R.drawable.ic_remove_red_eye_black_24dp);
        final PrimaryDrawerItem gamesAndPuzzle = new PrimaryDrawerItem().withName("Games & Puzzles").withIdentifier(7).withIcon(R.drawable.ic_casino_black_24dp);
        final PrimaryDrawerItem backup = new PrimaryDrawerItem().withName("Backup").withIdentifier(8).withIcon(GoogleMaterial.Icon.gmd_save);
        final PrimaryDrawerItem logout = new PrimaryDrawerItem().withName("Logout").withIdentifier(9).withIcon(FontAwesome.Icon.faw_sign_out);

headerResult = new AccountHeaderBuilder()
                .withActivity(this)
                .withHeaderBackground(R.drawable.header)
                .withSelectionListEnabledForSingleProfile(false)
                .addProfiles(userProfile)
                .withOnAccountHeaderListener(new AccountHeader.OnAccountHeaderListener() {
                    @Override
                    public boolean onProfileChanged(View view, IProfile profile, boolean currentProfile) {
                        return false;
                    }
                })
                .build();

            result = new DrawerBuilder()
                    .withActivity(this)
                    .withAccountHeader(headerResult)
                    .withToolbar(toolbar)
                    .withDisplayBelowStatusBar(false)
                    .withTranslucentStatusBar(true)
                    .withSavedInstance(savedInstanceState)
                    .withActionBarDrawerToggle(true)
                    .withActionBarDrawerToggleAnimated(true)
                    .addDrawerItems(home)
                    .addDrawerItems(profile)
                    .addDrawerItems(gallery)
                    .addDrawerItems(recognition)
                    .addDrawerItems(maps)
                    .addDrawerItems(tagAndLocate)
                    .addDrawerItems(gamesAndPuzzle)
                    .addDrawerItems(backup)
                    .addDrawerItems(new DividerDrawerItem())
                    .addDrawerItems(logout)
                    .buildForFragment();

        resultStandard.setOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
                @Override
                public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {

                    int drawItemId = (int) drawerItem.getIdentifier();
                    Intent intent;
                    Fragment fragment;
                    switch (drawItemId) {

                        case 1:
                                fragment = new HomeFragment();
                                gaFragmentStack.add(home);
                                break;

                        case 2:
                            fragment = new ProfileFragment();
                            gaFragmentStack.add(profile);
                            break;
                        case 3:
                            fragment = new GalleryFragment();
                            gaFragmentStack.add(gallery);
                            break;
                        case 4:
                            fragment = new RecognitionFragment();
                            gaFragmentStack.add(recognition);
                            break;
                        case 5:
                            fragment = new MapsFragment();
                            gaFragmentStack.add(maps);
                            break;
                        case 6:
                            fragment = new TagLocateFragment();
                            gaFragmentStack.add(tagAndLocate);
                            break;
                        case 7:
                            fragment = new GamesPuzzlesFragment();
                            gaFragmentStack.add(gamesAndPuzzle);
                            break;
                        case 8:
                            fragment = new BackupFragment();
                            gaFragmentStack.add(backup);
                            break;
                        default:
                            fragment = new HomeFragment();
                            break;
                    }
                    if (drawItemId == 9) {
                        FirebaseAuth.getInstance().signOut();
                        SharedPreferences.Editor editor = preferences.edit();
                        editor.clear();
                        editor.apply();
                        intent = new Intent(MainMenuActivity.this, SplashScreen.class);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                        startActivity(intent);
                        finish();
                    }

                    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                    transaction.replace(R.id.container_gaFragments, fragment);
                    transaction.commit();
                    return false;
                }
            });

我只想根据条件隐藏一些抽屉物品。有没有办法做到这一点？任何帮助表示赞赏。

Answer 1

无法从抽屉中隐藏特定项目。您可以通过删除所有项目（removeAllItems() 和 removeAllStickyFooterItems()）并有选择地再次添加它们来解决此问题。下面是 Kotlin 的示例代码，您可以使用滑块内的 IF 语句处理此问题。应用 {...}

fun refreshMenuItems() {
    slider.apply {
        removeAllItems()
        removeAllStickyFooterItems()
    
        if (isLoggedUser == false) {
            addItems(
                PrimaryDrawerItem().apply {
                    nameText = "Login"
                    iconicsIcon = GoogleMaterial.Icon.gmd_verified_user
                    identifier = 70
                },
                DividerDrawerItem(),
                PrimaryDrawerItem().apply {
                    nameText = "Register"
                    iconicsIcon = GoogleMaterial.Icon.gmd_how_to_reg
                    identifier = 80
                }
            )
        } else {
            addItems(
                PrimaryDrawerItem().apply {
                    nameText = "My profile"
                    iconicsIcon = GoogleMaterial.Icon.gmd_verified_user
                    identifier = 70
                },
                DividerDrawerItem(),
                PrimaryDrawerItem().apply {
                    nameText = "My reservations"
                    iconicsIcon = GoogleMaterial.Icon.gmd_how_to_reg
                    identifier = 80
                }
            )
    
            addStickyDrawerItems(
                PrimaryDrawerItem().apply {
                    nameText = "Log out"
                    isSelectable = false
                    identifier = 100
                }
            )
        }
    }

}

例如，您可以从 onResume() 方法中调用此方法

override fun onResume() {
    super.onResume()
    changeDrawerUserName()
    refreshMenuItems()
}