Android导航组件,带有多个菜单,用于底部导航
我有一个Android应用程序(Java),它使用导航组件设置底部导航。该应用程序由单个活动(主)组成,其他所有内容都以片段形式加载
其想法是启动启动屏幕,检查用户是否登录。如果用户已登录,则会加载主屏幕,并显示底部导航(以前隐藏)
底部导航由3个选项卡组成
然而,当用户登录时,它可以是两种类型的用户之一。如果他是用户,他可以访问应用程序的所有部分。然而,如果用户是访问者,他将只能访问两个部分。在这种情况下,我想有一个不同的底部导航菜单,只有2个标签可见
如果已在主活动中分配了主底部导航,如何根据用户类型替换底部导航
这是主活动中的代码:
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FragmentManager supportFragmentManager = getSupportFragmentManager();
NavHostFragment navHostFragment = (NavHostFragment) supportFragmentManager.findFragmentById(R.id.nav_host_fragment);
NavController navController = navHostFragment.getNavController();
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(R.id.homeFragment, R.id.libraryFragment, R.id.searchFragment, R.id.myStuffFragment).build();
NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration);
BottomNavigationView bottomNav = findViewById(R.id.bottom_nav);
NavigationUI.setupWithNavController(bottomNav, navController);
navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() {
@Override
public void onDestinationChanged(@NonNull NavController controller, @NonNull NavDestination destination, @Nullable Bundle arguments) {
if (destination.getId() == R.id.splashScreenFragment || destination.getId() == R.id.welcomeFragment || destination.getId() == R.id.signInFragment) {
toolbar.setVisibility(View.GONE);
bottomNav.setVisibility(View.GONE);
} else if (destination.getId() == R.id.audioPlayerFragment) {
bottomNav.setVisibility(View.GONE);
} else {
toolbar.setVisibility(View.VISIBLE);
bottomNav.setVisibility(View.VISIBLE);
}
}
});
这是SplashScreenFragment中的代码(这是导航图中的startDestination):
public class SplashScreenFragment extends Fragment {
private static final String TAG = "SplashScreenFragment";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_splash_screen, container, false);
return v;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
SharedPreferences getSharedData = this.getActivity().getSharedPreferences("AppTitle", Context.MODE_PRIVATE);
Boolean loggedIn = getSharedData.getBoolean("isUserLoggedIn", false);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (!loggedIn) {
Navigation.findNavController(view).navigate(R.id.action_splashScreenFragment_to_welcomeFragment);
} else {
Navigation.findNavController(view).navigate(R.id.action_splashScreenFragment_to_homeFragment);
}
}
}, 2000);
}
# 1 楼答案
默认情况下,您可以在
BottomNavigationView
中拥有完整的菜单项,因此当订阅用户登录时,不需要更改菜单如果用户未订阅,则可以使用
removeItem()
以编程方式从菜单中删除所需的项因此,在
MainActivity
中添加一个条件:并对所有要删除的菜单项ID执行相同的操作