一个非常简单的有片段的应用程序，我有一个活动，其中包含一个从侧边导航抽屉打开的日历视图。当您打开“logs”片段时，它会将您发送到calendaractivity，以便您选择要记录信息的日期。但是，当您这样做时，应用程序会崩溃，我发现如果您删除行“logcalendar=（calendarview）findviewbyid（r.id.logcalendar）；”它不会崩溃，但很明显我现在不能用日历来确定日期。
有没有人知道为什么会崩溃，或者有没有其他解决方案能为我想要实现的目标提供相同的解决方案。
谢谢。
日历活动类

public class CalendarActivity extends AppCompatActivity {

    private static final String TAG = "CalendarActivity";

    private CalendarView logCalendar;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calendar);
        logCalendar = (CalendarView) findViewById(R.id.logCalendar);

        logCalendar.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
            @Override
            public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
                String date =  dayOfMonth + "/" + month +"/" + year;
                Log.d(TAG, "onSelectedDayChange: date:" + date);
            }
        });

    }
}

打开calenderactivity类的类

private TextView currentDate;
    private Button dateButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

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

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {

        currentDate = (TextView) view.findViewById(R.id.currentDate);
        dateButton = (Button) view.findViewById(R.id.dateButton);

        Intent intent = new Intent(getActivity(), CalendarActivity.class);
        startActivity(intent);

        super.onViewCreated(view, savedInstanceState);
    }
}

我的logcat

2020-12-20 16:45:53.987 28316-28316/com.example.co3201weighttrainingapplication E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.co3201weighttrainingapplication, PID: 28316
    java.lang.ClassCastException: com.applandeo.materialcalendarview.CalendarView cannot be cast to android.widget.CalendarView
        at com.example.co3201weighttrainingapplication.LogsFragment.onViewCreated(LogsFragment.java:48)
        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:332)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1187)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)
        at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)
        at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1497)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:447)
        at androidx.fragment.app.FragmentManager.executeOps(FragmentManager.java:2169)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1992)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1947)
        at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849)
        at androidx.fragment.app.FragmentManager$4.run(FragmentManager.java:413)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)