android 视图模型，无法设置值

Question

我无法根据视图模型中的单选按钮设置字符串值。我只想让用户根据他们点击的内容进行选择并将其发送到视图模型当我尝试记录该值时，它只是保持空白

我看到了一些答案，但 none 对我的情况有所帮助

我尝试设置它的片段：

public class TJPageOne extends Fragment {

    private TJViewModel tjViewModel;
    private EditText placeInput, peopleInput;
    private RadioGroup timeRadioGroup , peopleRadioGroup;
    private RadioButton timeRadioButton, peopleRadioButton;
    private Button returnButton, nextButton;

    public TJPageOne() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        tjViewModel = new ViewModelProvider(requireActivity()).get(TJViewModel.class);
      }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_tj_page_one, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        findViews(view);
        setRadioGroups();
        setButtons();

    }

    private void findViews(View view) {
        placeInput = view.findViewById(R.id.place_input);
        peopleInput = view.findViewById(R.id.people_input);
        returnButton = view.findViewById(R.id.tj_return);
        nextButton = view.findViewById(R.id.page_one_next);
        timeRadioGroup = view.findViewById(R.id.time_radiogroup);
        peopleRadioGroup = view.findViewById(R.id.people_radiogroup);
    }

    private void setRadioGroups() {

    }

    private void setButtons() {
        returnButton.setOnClickListener(v ->{
            Intent intent = new Intent(this.requireActivity(), MainActivity.class);
            startActivity(intent);
            getActivity().finish();
        });

        nextButton.setOnClickListener(v ->{
            peopleRadioGroup.setOnCheckedChangeListener((group, checkedId) -> {
                // Get the selected Radio Button
                if(checkedId == R.id.morning){
                    tjViewModel.setTimeText("Morning");
                }
                else if(checkedId == R.id.noonish){
                    tjViewModel.setTimeText("Noonish");
                }
                else if(checkedId == R.id.afternoon){
                    tjViewModel.setTimeText("Afternoon");
                }
                else if(checkedId == R.id.evening) {
                    tjViewModel.setTimeText("Evening");
                }
                else if(checkedId == R.id.night){
                    tjViewModel.setTimeText("Night");
                }
                else{
                    tjViewModel.setTimeText("No time selected");
                }
            });
            timeRadioGroup.setOnCheckedChangeListener(((group, checkedId) -> {
                if(checkedId == R.id.alone){
                    tjViewModel.setPeopleText("Alone");
                }
                else{
                    tjViewModel.setPeopleText(peopleInput.getText().toString());
                }
            }));

            NavController navController = Navigation.findNavController(getView());
            navController.navigate(R.id.action_tjPageOne_to_tjPageTwo);
        });
    }
}

视图模型：

import androidx.lifecycle.ViewModel;
import java.util.ArrayList;

public class TJViewModel extends ViewModel {
    private String locationText = "";
    private String timeText = "";
    private String peopleText = "";
    private String situationText = "";
    private String behaviorText = "";
    private String emotionText = "";
    private String emotionalActionText = "";
    private ArrayList<String> thoughtArray;



    public void setlocationText(CharSequence input) {
        locationText = input.toString();
    }

    public void setTimeText(String input) {
        timeText = input;
    }

    public void setPeopleText(String input) {peopleText = input;}

    public void setSituationText(CharSequence input){
        situationText = input.toString();
    }

    public void setBehaviorText(CharSequence input){
        behaviorText = input.toString();
    }

    public void setEmotionText(CharSequence input){
        emotionText = input.toString();
    }

    public void setEmotionalActionText(CharSequence input){ emotionalActionText = input.toString(); }

    public void setThoughtArray(ArrayList<String> input){ thoughtArray = input;
    }

    public String getLocationText() {
        return locationText;
    }
    public String getTimeText(){ return timeText; }
    public String getPeopleText() {return  peopleText;}
    public String getSituationText(){ return situationText; }
    public String getBehaviorText(){ return behaviorText; }
    public String getEmotionText(){ return emotionText; }
    public String getEmotionalActionText(){ return emotionalActionText; }
    public ArrayList<String> getThoughtArray(){ return thoughtArray; }

}

在帮助下修复了它，这是工作代码：

public class TJPageOne extends Fragment {

    private TJViewModel tjViewModel;
    private EditText placeInput, peopleInput;
    private RadioGroup timeRadioGroup , peopleRadioGroup;
    private Button returnButton, nextButton;

    public TJPageOne() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        tjViewModel = new ViewModelProvider(requireActivity()).get(TJViewModel.class);
      }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_tj_page_one, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        findViews(view);
        setRadioGroups(view);
        setButtons();

    }

    private void findViews(View view) {
        placeInput = view.findViewById(R.id.place_input);
        peopleInput = view.findViewById(R.id.people_input);
        returnButton = view.findViewById(R.id.tj_return);
        nextButton = view.findViewById(R.id.page_one_next);
        timeRadioGroup = view.findViewById(R.id.time_radiogroup);
        peopleRadioGroup = view.findViewById(R.id.people_radiogroup);
    }

    private void setRadioGroups(View view) {
        timeRadioGroup.setOnCheckedChangeListener((group, checkedId) -> {
            RadioButton timeRadioButton = (RadioButton) view.findViewById(checkedId);
            tjViewModel.setTimeText(timeRadioButton.getText().toString());
        });
        peopleRadioGroup.setOnCheckedChangeListener(((group, checkedId) -> {
            RadioButton peopleRadioButton = (RadioButton) view.findViewById(checkedId);
            tjViewModel.setPeopleText(peopleRadioButton.getText().toString());
        }));
    }

    private void setButtons() {
        returnButton.setOnClickListener(v ->{
            Intent intent = new Intent(this.requireActivity(), MainActivity.class);
            startActivity(intent);
            getActivity().finish();


        });

        nextButton.setOnClickListener(v ->{

            NavController navController = Navigation.findNavController(getView());
            navController.navigate(R.id.action_tjPageOne_to_tjPageTwo);
        });
    }
}

Answer 1

因为您在 setOnClickListener 单选按钮中设置了 setOnCheckedChangeListener，只有在您单击 nextButton 后才会监听。

这样试试：

private void setButtons() {
        returnButton.setOnClickListener(v ->{
            Intent intent = new Intent(this.requireActivity(), MainActivity.class);
            startActivity(intent);
            getActivity().finish();
        });
        peopleRadioGroup.setOnCheckedChangeListener((group, checkedId) -> {
            // Get the selected Radio Button
            if(checkedId == R.id.morning){
                tjViewModel.setTimeText("Morning");
            }
            else if(checkedId == R.id.noonish){
                tjViewModel.setTimeText("Noonish");
            }
            else if(checkedId == R.id.afternoon){
                tjViewModel.setTimeText("Afternoon");
            }
            else if(checkedId == R.id.evening) {
                tjViewModel.setTimeText("Evening");
            }
            else if(checkedId == R.id.night){
                tjViewModel.setTimeText("Night");
            }
            else{
                tjViewModel.setTimeText("No time selected");
            }
        });
        timeRadioGroup.setOnCheckedChangeListener(((group, checkedId) -> {
            if(checkedId == R.id.alone){
                tjViewModel.setPeopleText("Alone");
            }
            else{
                tjViewModel.setPeopleText(peopleInput.getText().toString());
            }
        }));
        nextButton.setOnClickListener(v ->{
            NavController navController = Navigation.findNavController(getView());
            navController.navigate(R.id.action_tjPageOne_to_tjPageTwo);
        });
    }

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