Как сортировать элементы в RecyclerView в зависимости от даты
Вот как должен выглядеть мой экран.
Я добавил эту библиотеку https://github.com/ShamylZakariya/StickyHeaders и попытался сделать это аналогичным образом.
Моя модель выглядит так:
Public Class Transaction {
private int id;
private Date createdDate;
private String description;
private int amount;
private float newCredits;
}
а также
public class Transactions {
private int totalCount;
private List<Transaction> transactions = new ArrayList<>();
}
Таким образом, после того, как я получаю все свои транзакции, я устанавливаю данные в адаптере... вот как выглядит мой адаптер:
public class WalletAdapter extends SectioningAdapter {
private static final boolean USE_DEBUG_APPEARANCE = false;
private Transactions transactions;
private List<Section> sections = new ArrayList<>();
public WalletAdapter() {
}
private class Section {
String alpha;
Transactions transactions;
}
public Transactions getTransactions() {
return transactions;
}
public void setTransactions(Transactions transactions) {
this.transactions = transactions;
sections.clear();
char alpha = 0;
Section currentSection = null;
for (Transaction transaction : transactions.getTransactions()) {
String date = parseDate(transaction.getCreatedDate());
if (date.charAt(0) != alpha) {
if (currentSection != null) {
sections.add(currentSection);
}
currentSection = new Section();
alpha = date.charAt(0);
currentSection.alpha = String.valueOf(alpha);
}
if (currentSection != null) {
currentSection.transactions = this.transactions;
}
}
sections.add(currentSection);
notifyAllSectionsDataSetChanged();
}
private String parseDate(Date date) {
DateFormat df = new SimpleDateFormat("dd.MM.yyyy", Locale.getDefault());
String formattedDate = "";
formattedDate = df.format(date);
return formattedDate;
}
@Override
public int getNumberOfSections() {
return sections.size();
}
@Override
public boolean doesSectionHaveHeader(int sectionIndex) {
return true;
}
@Override
public boolean doesSectionHaveFooter(int sectionIndex) {
return false;
}
@Override
public int getNumberOfItemsInSection(int sectionIndex) {
return sections.get(sectionIndex).transactions.getTransactions().size();
}
@Override
public ItemViewHolder onCreateItemViewHolder(ViewGroup parent, int itemUserType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.wallet_item, parent, false);
return new ItemViewHolder(v);
}
@Override
public HeaderViewHolder onCreateHeaderViewHolder(ViewGroup parent, int headerUserType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.wallet_header, parent, false);
return new HeaderViewHolder(v);
}
@Override
public void onBindItemViewHolder(SectioningAdapter.ItemViewHolder viewHolder, int sectionIndex, int itemIndex, int itemType) {
Section section = sections.get(sectionIndex);
ItemViewHolder holder = (ItemViewHolder) viewHolder;
Transaction transaction = section.transactions.getTransactions().get(itemIndex);
holder.description.setText(transaction.getDescription());
holder.ammount.setText(String.valueOf(transaction.getAmount()));
holder.time.setText(parseDate(transaction.getCreatedDate()));
holder.total.setText(String.valueOf(transaction.getNewCredits()));
}
@Override
public void onBindHeaderViewHolder(SectioningAdapter.HeaderViewHolder viewHolder, int sectionIndex, int headerType) {
Section s = sections.get(sectionIndex);
HeaderViewHolder hvh = (HeaderViewHolder) viewHolder;
Transaction transaction = s.transactions.getTransactions().get(sectionIndex);
if (USE_DEBUG_APPEARANCE) {
hvh.itemView.setBackgroundColor(0x55ffffff);
hvh.dateHeader.setText(pad(sectionIndex * 2) + s.alpha);
} else {
hvh.dateHeader.setText(parseDate(transaction.getCreatedDate()));
}
}
private String pad(int spaces) {
StringBuilder b = new StringBuilder();
for (int i = 0; i < spaces; i++) {
b.append(' ');
}
return b.toString();
}
public class HeaderViewHolder extends SectioningAdapter.HeaderViewHolder {
TextView dateHeader;
public HeaderViewHolder(View itemView) {
super(itemView);
dateHeader = (TextView) itemView.findViewById(R.id.date);
}
}
public class ItemViewHolder extends SectioningAdapter.ItemViewHolder {
TextView description;
TextView time;
TextView ammount;
TextView total;
public ItemViewHolder(View itemView) {
super(itemView);
description = (TextView) itemView.findViewById(R.id.description);
time = (TextView) itemView.findViewById(R.id.time);
ammount = (TextView) itemView.findViewById(R.id.ammount);
total = (TextView) itemView.findViewById(R.id.new_credits);
}
}
}
Поэтому, если я делаю это таким образом, он сортирует и создает заголовки / разделы по дате, но он помещает все транзакции во все разделы, а не в соответствующую дату...
2 ответа
Похоже, это должно обрабатывать, если элемент должен иметь заголовок или нет. Например, если это первый элемент с этой датой, верните true, если нет - false.
@Override
public boolean doesSectionHaveHeader(int sectionIndex) {
return true;
}
РЕДАКТИРОВАТЬ:
Вы можете создать отфильтрованный список перед его настройкой. Например, для адресной книги с заголовком буквы имени:
public class AddressBookDemoAdapter extends SectioningAdapter {
Locale locale = Locale.getDefault();
static final boolean USE_DEBUG_APPEARANCE = false;
private class Section {
String alpha;
ArrayList<Person> people = new ArrayList<>();
}
public class ItemViewHolder extends SectioningAdapter.ItemViewHolder {
TextView personNameTextView;
public ItemViewHolder(View itemView) {
super(itemView);
personNameTextView = (TextView) itemView.findViewById(R.id.personNameTextView);
}
}
public class HeaderViewHolder extends SectioningAdapter.HeaderViewHolder {
TextView titleTextView;
public HeaderViewHolder(View itemView) {
super(itemView);
titleTextView = (TextView) itemView.findViewById(R.id.titleTextView);
}
}
List<Person> people;
ArrayList<Section> sections = new ArrayList<>();
public AddressBookDemoAdapter() {
}
public List<Person> getPeople() {
return people;
}
public void setPeople(List<Person> people) {
this.people = people;
sections.clear();
// sort people into buckets by the first letter of last name
char alpha = 0;
Section currentSection = null;
for (Person person : people) {
if (person.name.last.charAt(0) != alpha) {
if (currentSection != null) {
sections.add(currentSection);
}
currentSection = new Section();
alpha = person.name.last.charAt(0);
currentSection.alpha = String.valueOf(alpha);
}
if (currentSection != null) {
currentSection.people.add(person);
}
}
sections.add(currentSection);
notifyAllSectionsDataSetChanged();
}
@Override
public int getNumberOfSections() {
return sections.size();
}
@Override
public int getNumberOfItemsInSection(int sectionIndex) {
return sections.get(sectionIndex).people.size();
}
@Override
public boolean doesSectionHaveHeader(int sectionIndex) {
return true;
}
@Override
public boolean doesSectionHaveFooter(int sectionIndex) {
return false;
}
@Override
public ItemViewHolder onCreateItemViewHolder(ViewGroup parent, int itemType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.list_item_addressbook_person, parent, false);
return new ItemViewHolder(v);
}
@Override
public HeaderViewHolder onCreateHeaderViewHolder(ViewGroup parent, int headerType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View v = inflater.inflate(R.layout.list_item_addressbook_header, parent, false);
return new HeaderViewHolder(v);
}
@SuppressLint("SetTextI18n")
@Override
public void onBindItemViewHolder(SectioningAdapter.ItemViewHolder viewHolder, int sectionIndex, int itemIndex, int itemType) {
Section s = sections.get(sectionIndex);
ItemViewHolder ivh = (ItemViewHolder) viewHolder;
Person person = s.people.get(itemIndex);
ivh.personNameTextView.setText(capitalize(person.name.last) + ", " + capitalize(person.name.first));
}
@SuppressLint("SetTextI18n")
@Override
public void onBindHeaderViewHolder(SectioningAdapter.HeaderViewHolder viewHolder, int sectionIndex, int headerType) {
Section s = sections.get(sectionIndex);
HeaderViewHolder hvh = (HeaderViewHolder) viewHolder;
if (USE_DEBUG_APPEARANCE) {
hvh.itemView.setBackgroundColor(0x55ffffff);
hvh.titleTextView.setText(pad(sectionIndex * 2) + s.alpha);
} else {
hvh.titleTextView.setText(s.alpha);
}
}
private String capitalize(String s) {
if (s != null && s.length() > 0) {
return s.substring(0,1).toUpperCase(locale) + s.substring(1);
}
return "";
}
private String pad(int spaces) {
StringBuilder b = new StringBuilder();
for (int i = 0; i < spaces; i++) {
b.append(' ');
}
return b.toString();
}
}
Вы можете использовать сопоставимый интерфейс в своем классе транзакций и сравнить с конкретным полем, которое вы хотите отсортировать