步骤1：从 edittext 内部 AdminFragment.java . 我不会发帖的 xml 除了一个 EditText . 你可以把它放在任何地方 Activity .
adminfragment.java文件

public class AdminFragment extends Fragment {

    public static AdminFragment newInstance() {
        return new AdminFragment();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.main_fragment, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
        EditText quoteEditText = view.findViewById(R.id.quote_et);
        Button quoteBtn = view.findViewById(R.id.quote_btn);
        quoteBtn.setOnClickListener(v -> {
            String quote = quoteEditText.getText().toString();
            if (quote.isEmpty()){
                Toast.makeText(getContext(),"Please Enter Quote!",Toast.LENGTH_SHORT).show();
            }else {
                Intent intent = new Intent(getActivity(), BottomNavigationActivity.class);
                intent.putExtra("quote",quote);
                startActivity(intent);
            }
        });
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
}

第二步：如你所说 BottomNavigationActivity 有3个碎片 SnapFragment.java , HomeFragment.java 以及 AccountFragment.java . 报价文本将从 AdminFragment.java 同时单击 updateQuote 内部按钮 BottomNavigationActivity . 一次 quote 在内部接收 BottomNavigationActivity ，我正在打开第三个片段，即 AccountFragment 显示引用的文本。
bottomnavigationactivity.java文件

public class BottomNavigationActivity extends AppCompatActivity {

    String updatedQuote = "";
    BottomNavigationViewModel bottomNavigationViewModel;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bottom_navigation);
        bottomNavigationViewModel = new ViewModelProvider(this).get(BottomNavigationViewModel.class);
        BottomNavigationView navView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_snap, R.id.navigation_home, R.id.navigation_account)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
        NavigationUI.setupWithNavController(navView, navController);

        updatedQuote = getIntent().getStringExtra("quote");
        Log.d("tisha==>>","Quote = "+updatedQuote);
        bottomNavigationViewModel.setQuoteLiveData(updatedQuote);

       // Below I am selecting 3rd Fragment to show Quote
        navView.setSelectedItemId(R.id.navigation_account);
    }

}

活动\底部\导航.xml

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="?attr/actionBarSize">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />

</androidx.constraintlayout.widget.ConstraintLayout>

我正在使用 ViewModel 在这里，因为它会更容易通过 quote 从当前活动到 AccountFragment.java 作为 AccountFragment 不是由这里的构造函数示例化的。 BottomNavigationViewModel 负责储存 quote 在需要的地方提供。
bottomnavigationviewmodel.java版本

public class BottomNavigationViewModel extends ViewModel {
    private final MutableLiveData<String> quoteLiveData;
    public String getQuoteLiveData(){
        return quoteLiveData.getValue();
    }
    public void setQuoteLiveData(String quote){
        quoteLiveData.setValue(quote);
    }
    public BottomNavigationViewModel(){
        quoteLiveData = new MutableLiveData<>();
    }
}

第三步：现在进去 AccountFragment ，我刚刚得到 view model 它是在内部创建的 BottomNavigationActivity 收集 quote 并在 TextView .
accountfragment.java文件

public class AccountFragment extends Fragment {

    private String mQuote;
    private BottomNavigationViewModel bottomNavigationViewModel;
    public AccountFragment() {
        // Required empty public constructor
    }

    public static AccountFragment newInstance(String quote) {
        return new AccountFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        bottomNavigationViewModel = new ViewModelProvider(requireActivity()).get(BottomNavigationViewModel.class);
        mQuote = bottomNavigationViewModel.getQuoteLiveData();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_account, container, false);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState){
        TextView quoteView = view.findViewById(R.id.quote_tv);

        quoteView.setText(mQuote);
    }
}