我有一个带有日历和微调器的片段来过滤数据。
在日历下，有一个回收站视图，可在日历中显示通知。
我显示当前月份的所有通知，并将recyclerview滚动到今天的通知，显示的顶部项目是今天的第一个。
通过通知类型的微调器过滤器。 （全部，通用，任务，考试，缺席）
正常工作但当我选择任何内容并再次选择ALL时，recyclerview会滚动到我使用rvNotifications.scrollToPosition（index）设置的位置，但该项目位于显示项目的底部，而不是顶部。
有人可以帮助我吗？
public class CalendarFragment extends Fragment implements NotificationsAdapter.ListItemClickListener {
private ArrayList<String> types;
private ArrayList<SchoolNotification> notifications = new ArrayList();
private ArrayList<SchoolNotification> notifications_month = new ArrayList();
private ArrayList<SchoolNotification> notifications_generic = new ArrayList();
private ArrayList<SchoolNotification> notifications_task = new ArrayList();
private ArrayList<SchoolNotification> notifications_exam = new ArrayList();
private ArrayList<SchoolNotification> notifications_absence = new ArrayList();
private ArrayList<SchoolNotification> notifications_shown = new ArrayList();
private List<CalendarDay> generic_events_list = new ArrayList();
private List<CalendarDay> task_events_list = new ArrayList();
private List<CalendarDay> exam_events_list = new ArrayList();
private List<CalendarDay> absence_events_list = new ArrayList();
private Spinner sp_types;
private NotificationsAdapter mAdapter;
private RecyclerView rvNotifications;
private MaterialCalendarView calendar_mv;
private CalendarDay selectedDate;
private Integer index = 0;
private Integer indexOrigin = 0;
private Integer indexGeneric = 0;
private Integer indexTask = 0;
private Integer indexExam = 0;
private Integer indexAbsence = 0;
public static CalendarFragment newInstance() {
CalendarFragment fragment = new CalendarFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
notifications = getArguments().getParcelableArrayList("notifications");
View view = inflater.inflate(R.layout.fragment_calendar, container, false);
view = initialize(view);
return view;
}
private View initialize(View view) {
rvNotifications = (RecyclerView) view.findViewById(R.id.rv_notifications);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
rvNotifications.setLayoutManager(layoutManager);
rvNotifications.setHasFixedSize(true);
calendar_mv = (MaterialCalendarView) view.findViewById(R.id.calendar_view);
sp_types = (Spinner) view.findViewById(R.id.sp_event_type);
types = new ArrayList<>(Arrays.asList(getActivity().getResources().getString(R.string.all_events),
getActivity().getResources().getString(R.string.generic), getActivity().getResources().getString(R.string.task),
getActivity().getResources().getString(R.string.exam), getActivity().getResources().getString(R.string.abscence)));
NotificationsSelectedMonth();
classifyNotifications();
mAdapter = new NotificationsAdapter(notifications_shown, getResources(), CalendarFragment.this);
rvNotifications.setAdapter(mAdapter);
rvNotifications.scrollToPosition(index);
indexOrigin = index;
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), R.layout.spinner_item, types);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp_types.setAdapter(adapter);
List<CalendarDay> today = new ArrayList<>();
Calendar today_cal = Calendar.getInstance();
today_cal.set(Calendar.HOUR_OF_DAY, 0);
CalendarDay calendarDay = CalendarDay.from(today_cal);
today.add(calendarDay);
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.primary_darker), generic_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.green), task_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.red), exam_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.black), absence_events_list));
setListeners();
return view;
}
private void setListeners() {
sp_types.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
calendar_mv.removeDecorators();
List<CalendarDay> today = new ArrayList<>();
Calendar today_cal = Calendar.getInstance();
today_cal.set(Calendar.HOUR_OF_DAY, 0);
CalendarDay calendarDay = CalendarDay.from(today_cal);
today.add(calendarDay);
calendar_mv.addDecorator(new DateDecorator(getActivity(), today, true));
switch (position) {
case 0:
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.primary_darker), generic_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.green), task_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.red), exam_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.black), absence_events_list));
mAdapter = new NotificationsAdapter(notifications_shown, getResources(), CalendarFragment.this);
rvNotifications.swapAdapter(mAdapter, false);
rvNotifications.scrollToPosition(index);
break;
case 1:
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.primary_darker), generic_events_list));
mAdapter = new NotificationsAdapter(notifications_generic, getResources(), CalendarFragment.this);
rvNotifications.swapAdapter(mAdapter, false);
rvNotifications.scrollToPosition(indexGeneric);
break;
case 2:
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.green), task_events_list));
mAdapter = new NotificationsAdapter(notifications_task, getResources(), CalendarFragment.this);
rvNotifications.swapAdapter(mAdapter, false);
rvNotifications.scrollToPosition(indexTask);
break;
case 3:
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.red), exam_events_list));
mAdapter = new NotificationsAdapter(notifications_exam, getResources(), CalendarFragment.this);
rvNotifications.setAdapter(mAdapter);
rvNotifications.scrollToPosition(indexExam);
break;
case 4:
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.black), absence_events_list));
mAdapter = new NotificationsAdapter(notifications_absence, getResources(), CalendarFragment.this);
rvNotifications.swapAdapter(mAdapter, false);
rvNotifications.scrollToPosition(indexAbsence);
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
}
});
@Override
public void onListItemClick(SchoolNotification notification) {
NotificationDetailFragment detailFragment = NotificationDetailFragment.newInstance();
Bundle bundle = new Bundle();
bundle.putParcelable("notification", notification);
detailFragment.setArguments(bundle);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame_layout, detailFragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
private void NotificationsSelectedMonth() {
SchoolNotification notif;
Date notif_date;
Calendar cal = Calendar.getInstance();
notifications_month = new ArrayList<>();
for (int i = 0; i < notifications.size(); i++) {
notif = notifications.get(i);
notif_date = notif.getDate();
cal.setTime(notif_date);
if (((Integer) cal.get(Calendar.MONTH)) == calendar_mv.getCurrentDate().getMonth()) {
notifications_month.add(notif);
}
}
}
private void classifyNotifications() {
initializeCalendarsDays();
initializeNotificationCollections();
Calendar calendar = Calendar.getInstance();
Calendar cal = Calendar.getInstance();
CalendarDay calendarDay;
SchoolNotification notif;
Date notif_date;
Calendar auxcal = Calendar.getInstance();
auxcal.add(Calendar.DATE, + 1);
Date tomorrow = cal.getTime();
Boolean setIndex = false;
Boolean setIndexG = false;
Boolean setIndexT = false;
Boolean setIndexE = false;
Boolean setIndexA = false;
for (int i = 0; i < notifications_month.size(); i++) {
notif = notifications_month.get(i);
notif_date = notif.getDate();
if (notif_date.before(tomorrow) && !setIndex) {
index = i;
setIndex = true;
}
cal.setTime(notif_date);
calendar.set(cal.get(Calendar.YEAR),
cal.get(Calendar.MONTH), //months starts from 0
cal.get(Calendar.DAY_OF_MONTH));
calendarDay = CalendarDay.from(calendar);
if (selectedDate == null || (selectedDate.getYear() == calendarDay.getYear() &&
selectedDate.getMonth() == calendarDay.getMonth() &&
selectedDate.getDay() == calendarDay.getDay())) {
notifications_shown.add(notif);
}
switch (notif.getType()) {
case StaticConfiguration.GENERIC:
// if (maxDayGeneric.compareTo(dayToday) > 0 || dayToday.compareTo(notif_date) > 0) {
// indexGeneric = notifications_generic.size();
// }
if (notif_date.before(tomorrow) && !setIndexG) {
indexGeneric = notifications_generic.size();
setIndexG = true;
}
generic_events_list.add(calendarDay);
if (selectedDate == null || (selectedDate.getYear() == calendarDay.getYear() &&
selectedDate.getMonth() == calendarDay.getMonth() &&
selectedDate.getDay() == calendarDay.getDay())) {
notifications_generic.add(notif);
}
break;
case StaticConfiguration.TASK:
// if (maxDayTask.compareTo(dayToday) > 0 || dayToday.compareTo(notif_date) > 0) {
// indexTask = notifications_task.size();
// }
if (notif_date.before(tomorrow) && !setIndexT) {
indexTask = notifications_task.size();
setIndexT = true;
}
task_events_list.add(calendarDay);
if (selectedDate == null || (selectedDate.getYear() == calendarDay.getYear() &&
selectedDate.getMonth() == calendarDay.getMonth() &&
selectedDate.getDay() == calendarDay.getDay())) {
notifications_task.add(notif);
}
break;
case StaticConfiguration.EXAM:
// if (maxDayExam.compareTo(dayToday) > 0 || dayToday.compareTo(notif_date) > 0) {
// indexExam = notifications_exam.size();
// }
if (notif_date.before(tomorrow) && !setIndexE) {
indexExam = notifications_exam.size();
setIndexE = true;
}
exam_events_list.add(calendarDay);
if (selectedDate == null || (selectedDate.getYear() == calendarDay.getYear() &&
selectedDate.getMonth() == calendarDay.getMonth() &&
selectedDate.getDay() == calendarDay.getDay())) {
notifications_exam.add(notif);
}
break;
case StaticConfiguration.ABSENCE:
// if (maxDayAbsence.compareTo(dayToday) > 0 || dayToday.compareTo(notif_date) > 0) {
// indexAbsence = notifications_absence.size();
// }
if (notif_date.before(tomorrow) && !setIndexA) {
indexAbsence = notifications_absence.size();
setIndexA = true;
}
absence_events_list.add(calendarDay);
if (selectedDate == null || (selectedDate.getYear() == calendarDay.getYear() &&
selectedDate.getMonth() == calendarDay.getMonth() &&
selectedDate.getDay() == calendarDay.getDay())) {
notifications_absence.add(notif);
}
break;
}
}
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.primary_darker), generic_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.green), task_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.red), exam_events_list));
calendar_mv.addDecorator(new DateDecorator(getActivity(), getColor(getActivity(), R.color.black), absence_events_list));
}
private void initializeCalendarsDays() {
generic_events_list.clear();
task_events_list.clear();
exam_events_list.clear();
absence_events_list.clear();
}
private void initializeNotificationCollections() {
notifications_shown.clear();
notifications_generic.clear();
notifications_task.clear();
notifications_exam.clear();
notifications_absence.clear();
}
}
答案 0 :(得分：1)
您应该为您的回收商视图设置偏移量，如：
layoutManager.scrollToPositionWithOffset(index, 0);
答案 1 :(得分：0)
带
rvNotifications.setAdapter（mAdapter）;
而不是
rvNotifications.swapAdapter（mAdapter，false）;
它有效。但我不知道这是否是一个有效的答案