正在將對象發送到碎片

如果已經創建了片段，onCreateView()方法在附加片段時只被調用一次，那么在從活動接收數據時，getArgumens()不會被調用。

所以在本例中，我建議您使用ViewModel來與片段通信。

首先，您需要在buid.gradel中添加這個Dependencie：

implementation "androidx.lifecycle:lifecycle-viewmodel:2.3.1"

然后創建一個擴展ViewModel的類：

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

public class LiveDeneme extends ViewModel {

    private final MutableLiveData<String> mutableLiveData = new MutableLiveData<>();


    public void addDeneme(String deneme) {
        mutableLiveData.setValue(deneme);
    }

    public LiveData<String> getDeneme() {
        return mutableLiveData;
    }
}

在活動中初始化onCreate()方法中的ViewModel：

private LiveDeneme provider;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        provider = new ViewModelProvider(this).get(LiveDeneme.class);

        /*
        Rest of your Code
         */
    }

當您發送數據時，請按以下方式使用：

public void getDatafromFireBase(){

    DocumentReference documentReference=(DocumentReference) firebaseFirestore.collection("?ifre").document("?ifre");
    documentReference.addSnapshotListener(new EventListener<DocumentSnapshot>() {
        @Override
        public void onEvent(@Nullable DocumentSnapshot value, @Nullable FirebaseFirestoreException error) {
            if (error!=null){

            }
            if (value!=null){

                Map<String,Object> map=value.getData();
                Number ?ifre1=(Number) value.get("?ifre");
                ?ifre=String.valueOf(?ifre1);
                // send the data with this line 
                provider.addDeneme(sifre);

            }
        }
    });

}

最后，要從片段中接收數據，請使用如下觀察者：

public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {

    View root = inflater.inflate(R.layout.fragment_home, container, false);
    final TextView textView = root.findViewById(R.id.text_home);

    textView.setText(name);
    
    LiveDeneme liveDeneme = new ViewModelProvider(requireActivity()).get(LiveDeneme.class);

    liveDeneme.getDeneme().observe(getViewLifecycleOwner(), new Observer<String>() {
        @Override
        public void onChanged(String deneme) {
            textView.setText(deneme);
        }
    });
    

    return root;
}

Update

要發送ArrayList<String>，ViewModel類應如下所示：

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;

import java.util.ArrayList;

public class LiveDeneme extends ViewModel {

    private final MutableLiveData<ArrayList<String>> mutableLiveData = new MutableLiveData<>();


    public void addDeneme(ArrayList<String> deneme) {
        mutableLiveData.setValue(deneme);
    }

    public LiveData<ArrayList<String>> getDeneme() {
        return mutableLiveData;
    }
}

然后要從活動中發送此列表，只需執行以下操作：

provider.addDeneme(yourList)

最后在你的片段中收到這個列表：

LiveDeneme liveDeneme = new ViewModelProvider(requireActivity()).get(LiveDeneme.class);
    
liveDeneme.getDeneme().observe(getViewLifecycleOwner(), new Observer<ArrayList<String>>() {
                @Override
                public void onChanged(ArrayList<String> strings) {
                    for (String s : strings) {
                        System.out.println(s); // here I print all the element of the list 
                    }
                }
            });

更多信息請查閱官方文件