Hilfe beim einbinden von RecyclerView oder LiestView in Fragment

// Fragment1
 MainActivityViewModel mainModel; // InstanzVariable
 
     mainModel = new ViewModelProvider(requireActivity()).get(MainActivityViewModel.class);

        TextView textView2 = getActivity().findViewById(R.id.textView1);
        mainModel.getText().observe(getViewLifecycleOwner(), textView2::setText);
        

// Fragment2 
  MainActivityViewModel mainModel; // InstanzVariable
 
     mainModel = new ViewModelProvider(requireActivity()).get(MainActivityViewModel.class);
               
               // im Listener 
                  mainModel.setText("xxx");
        
        
// ViewModel

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

public class MainActivityViewModel extends ViewModel {

    private final MutableLiveData<String> mText;


    public MainActivityViewModel() {
        mText = new MutableLiveData<>();
        mText.setValue("Hallo");
    }

    public LiveData<String> getText() {
        return mText;
    }

    public void setText(String  mText) {
        this.mText.setValue( mText);
    }

}

public class JsonDataViewHolder extends RecyclerView.ViewHolder {

    public TextView interpret;
    public TextView titel;
    LinearLayout parentLayout;

    public JsonDataViewHolder(@NonNull View itemView) {
        super(itemView);
        interpret = itemView.findViewById(R.id.row_interpret);
        titel = itemView.findViewById(R.id.row_titel);
        parentLayout= itemView.findViewById(R.id.mycardview);
    }
}

  @Override
    public void onBindViewHolder(@NonNull JsonDataViewHolder holder, int i) {
        JsonDataList currentData = exampleList.get(i);
        holder.interpret.setText(currentData.getINTERPRET());
        holder.titel.setText(currentData.getTITEL());

        mainModel = new ViewModelProvider((ViewModelStoreOwner) this).get(MainActivityViewModel.class);

        holder.parentLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String stitel = (String) holder.titel.getText();
                String sinterpret = (String) holder.interpret.getText();
                mainModel.setSongTitel(stitel);
                mainModel.setInterpret(sinterpret);
             Toast.makeText(view.getContext(),stitel + " - " + sinterpret,Toast.LENGTH_SHORT).show();
            }
        });
    }

 AbSenden.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (edTxt.length() == 0) {
                    Toast.makeText(getActivity(), "Bitte gib deinen Namen an!", Toast.LENGTH_LONG).show();
                } else if (edTxt2.length() == 0) {
                    Toast.makeText(getActivity(), "Bitte gib einen Interpret an!", Toast.LENGTH_LONG).show();
                } else if (edTxt3.length() == 0) {
                    Toast.makeText(getActivity(), "Bitte gib einen Songtitel an!", Toast.LENGTH_LONG).show();
                } else {
                    //Wenn alles angegeben ist ausführen.

                    sendToServer(edTxt.getText().toString(), edTxt2.getText().toString(), edTxt3.getText().toString());


                    Toast.makeText(getActivity(), ruckgabestring, Toast.LENGTH_LONG).show();

                    edTxt.setText("");
                    //edTxt2.setText("");
                    mainModel.getInterpret().observe(getViewLifecycleOwner(), edTxt2::setText);
                    //edTxt3.setText("");
                    mainModel.getSongTitel().observe(getViewLifecycleOwner(), edTxt3::setText);

                    edTxt3.clearFocus();

                }
            }
        });
        return view;

    }

public class MainActivityViewModel extends ViewModel{

    private final MutableLiveData<String> songTitel;
    private final MutableLiveData<String> interpret;

    public MainActivityViewModel() {
        interpret = new MutableLiveData<>();
        songTitel = new MutableLiveData<>();
    }

    public LiveData<String> getInterpret() {
        return interpret;
    }
    public LiveData<String> getSongTitel() {
        return songTitel;
    }

    public void setInterpret(String  mText) {
        interpret.setValue( mText);
    }
    public void setSongTitel(String  mText) {
        songTitel.setValue( mText);
    }

}