Wie Artikel in RecyclerView sortieren auf einem Datum abhängig

Question

Dies ist, was mein Bildschirm aussehen sollte.

Ich habe diese Bibliothek https://github.com/ShamylZakariya/StickyHeaders und versuchte, sie in ähnlicher Art und Weise zu tun.

Mein Modell sieht wie folgt aus:

public class Transaktion {

private int id; 
private Date createdDate; 
private String description; 
private int amount; 
private float newCredits; 
} 

und

public class Transactions { 

private int totalCount; 
private List<Transaction> transactions = new ArrayList<>(); 
} 

So, nachdem ich alle meine Transaktionen hole ich die Daten in Adapterset .. das ist was mein Adapter wie folgt aussieht:

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); 
    } 
} 

}

Also, wenn ich es auf diese Weise tun, Er sortiert und erstellt Header/sections nach Datum, aber es setzt alle Transaktionen in allen Bereichen, nicht im passenden Termin ...

Answer 1

Scheint, wie dies sollte Handle wenn Item Header oder No haben soll. Smth mag, wenn es das erste Item mit diesem Datum ist, true zurück, wenn nicht - false.

@Override 
public boolean doesSectionHaveHeader(int sectionIndex) { 
    return true; 
} 

EDIT:

Sie können gefilterte Liste machen, bevor es zu setzen. Zum Beispiel für Adressbuch mit dem Namen Briefkopf:

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(); 
    } 

} 

Answer 2

Sie vergleichbare Schnittstelle in Ihrer Transaktionsklasse