我在 android 中構建了一個底部導航選項卡欄，它有 5 個片段，但問題是在應用程序啟動時它不會從 firestore 數據庫加載 recyclerview 列表。這個片段就是Home Fragment。但如果我隨機打開另一個選項卡，然后進入主頁選項卡，主頁選項卡列表會自行加載，但不會在應用程序啟動時自動加載下面是代碼。請協助public class MainActivity extends AppCompatActivity        implements NavigationView.OnNavigationItemSelectedListener {    private static final String TAG = "DocSnippets";    private FirebaseAuth mauth;    private FirebaseFirestore db = FirebaseFirestore.getInstance();    private CollectionReference UsersRef = db.collection("Users");    private DocumentReference noteRef = db.document("Notebook/My First Note");    private MySharedPreferences sp;    private DocumentReference currentUserRef;    private Button notificationList;    private String mUserId, tokenId, currentUserProfilePic, currentUserName, currentUserSpinnerC;    String currentUserID;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        sp = MySharedPreferences.getInstance(this);        setContentView(R.layout.activity_main);        mauth = FirebaseAuth.getInstance();// currentUserID = mauth.getCurrentUser().getUid();        UsersRef =FirebaseFirestore.getInstance().collection("Users");        mUserId = mauth.getUid();        tokenId = FirebaseInstanceId.getInstance().getToken();        Toolbar toolbar = findViewById(R.id.toolbar);        setSupportActionBar(toolbar);        FloatingActionButton fab = findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });    }