當(dāng)我剛剛單獨創(chuàng)建BottomNavigationView 時效果很好。但是將 BottomNavigationView 與 Fragment 一起使用有問題。問題是 Fragment 變化良好，但 BottomNavigationView 菜單固定在第一個菜單上。我需要在哪里設(shè)置編碼/字符集？（對不起，我的英語不好...）package com.example.ui;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import androidx.fragment.app.FragmentManager;import androidx.fragment.app.FragmentTransaction;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import com.google.android.material.bottomnavigation.BottomNavigationView;public class HomeActivity extends AppCompatActivity implements View.OnClickListener{    private FragmentManager fragmentManager = getSupportFragmentManager();    private menu1Fragment menu1Fragment = new menu1Fragment();    private menu2Fragment menu2Fragment = new menu2Fragment();    private menu3Fragment menu3Fragment = new menu3Fragment();    private menu4Fragment menu4Fragment = new menu4Fragment();    @Override    protected void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        getSupportActionBar().setIcon(R.drawable.logo);        getSupportActionBar().setDisplayShowHomeEnabled(true);        setContentView(R.layout.activity_home);        BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation_view);        FragmentTransaction transaction = fragmentManager.beginTransaction();        transaction.replace(R.id.frame_home, menu1Fragment).commitAllowingStateLoss();        bottomNavigationView.setOnNavigationItemSelectedListener(new ItemSelectedListener());    }    class ItemSelectedListener implements BottomNavigationView.OnNavigationItemSelectedListener {        @Override        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {            FragmentTransaction transaction = fragmentManager.beginTransaction();            switch (menuItem.getItemId()) {                case R.id.navigation_menu1:            }            return false;        }    }