java - CalendarView 在片段中不起作用？安卓

问题描述

因此，如果我创建一个新项目并将 calanderView 放入主要活动的 xml 文件中。然后在主要活动中写一些代码

public class MainActivity extends AppCompatActivity {
    private CalendarView mCalendarView;

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

        mCalendarView = findViewById(R.id.calendarView);
        mCalendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
            @Override
            public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
                String date =  year + "/" + month + "/" + dayOfMonth;
                Log.wtf("wtf","onSelectedDayChange" + date);
            }
        });
    }
}

setOnDateChangeListener 将按预期工作，并且 Log.wtf 将执行。

如果我尝试将 calanderView 放入片段的 xml 文件中。日历将出现在片段中，我可以单击日期。但由于某种原因， setOnDateChangeListener 不起作用。这是我的片段代码。抱歉，它是默认代码，所以有很多。我是使用片段的新手，所以我不确定最重要的是什么。我在 onCreateView 方法中实现了 setOnDateChangeListener。

public class ThirdFragment extends Fragment {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

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

    
    // TODO: Rename and change types and number of parameters
    public static ThirdFragment newInstance(String param1, String param2) {
        ThirdFragment fragment = new ThirdFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    private CalendarView mCalendarView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_third, container, false);
        mCalendarView = (CalendarView) view.findViewById(R.id.calendarView);
        mCalendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
            @Override
            public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
                String date =  year + "/" + month + "/" + dayOfMonth;
                Log.wtf("wtf","onSelectedDayChange" + date);
            }
        });

        return inflater.inflate(R.layout.fragment_third, container, false);
    }

    // TODO: Rename method, update argument and hook method into UI event
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

老实说，我不知道为什么这不起作用，因为我的项目中有其他片段，其中我有按钮单击事件起作用的按钮，我实现了这样的：

private OnFragmentInteractionListener mListener;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_login, container, false);
        button2 = view.findViewById(R.id.btn_register);
        button2.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               // IMPORTANT this interface can send stuff back to the main activity
               mListener.register();
           }
        });
        return view;
}

如果有人能给我一些见解，将不胜感激！

标签： javaandroidandroid-studioandroid-fragments

java - CalendarView 在片段中不起作用？安卓

问题描述

解决方案

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