Question

我有联系人列表，必须在每个字母表下以字母显示，如图所示

如何在RecyclerView中执行此操作，请提出解决方案。谢谢

Answer 1

这就是我跟随@ divers的帖子所做的：

正如他所提到的，我将团队列表传递给已排序的适配器，并在下一个名称之前添加了字母。

这是用于设置适配器的代码

 ArrayList<TeamMember> sortList(ArrayList<TeamMember> list) {
        Collections.sort(list, new Comparator<TeamMember>() {
            @Override
            public int compare(TeamMember teamMember1, TeamMember teamMember2) {
                return teamMember1.getFullname().compareTo(teamMember2.getFullname());
            }
        });
        return list;
    }

对从服务器获得的团队列表进行排序的代码如下：

ArrayList<TeamMember> addAlphabets(ArrayList<TeamMember> list) {
        int i = 0;
        ArrayList<TeamMember> customList = new ArrayList<TeamMember>();  TeamMember firstMember = new TeamMember();
        firstMember.setFullname(String.valueOf(list.get(0).getFullname().charAt(0)));
        firstMember.setType(1);
        customList.add(firstMember);
        for (i = 0; i < list.size() - 1; i++) {
            TeamMember teamMember = new TeamMember();
            char name1 = list.get(i).getFullname().charAt(0);
            char name2 = list.get(i + 1).getFullname().charAt(0);
            if (name1 == name2) {
                list.get(i).setType(2);
                customList.add(list.get(i));
            } else {
                list.get(i).setType(2);
                customList.add(list.get(i));
                teamMember.setFullname(String.valueOf(name2));
                teamMember.setType(1);
                customList.add(teamMember);
            }
        }
        list.get(i).setType(2);
        customList.add(list.get(i));
        return customList;
    }

在向列表中添加字母时，我设置了一个类型值，以确定其字母或团队名称是否在适配器内部检查以显示相应的布局。其代码如下所示：

  @Override
    public int getItemViewType(int position) {
        int viewType = 0;
        if (mMembers.get(position).getType() == TYPE_LETTER) {
            viewType = TYPE_LETTER;
        } else if (mMembers.get(position).getType() == TYPE_MEMBER) {
            viewType = TYPE_MEMBER;
        }

        return viewType;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {

        LayoutInflater mInflater = LayoutInflater.from(viewGroup.getContext());

        switch (viewType) {
            case TYPE_LETTER:
                ViewGroup vGroupImage = (ViewGroup) mInflater.inflate(R.layout.board_team_letter_item, viewGroup, false);
                ViewHolderLetter image = new ViewHolderLetter(vGroupImage);
                return image;
            case TYPE_MEMBER:
                ViewGroup vGroupText = (ViewGroup) mInflater.inflate(R.layout.board_team_member_item, viewGroup, false);
                ViewHolderMember text = new ViewHolderMember(vGroupText);
                return text;
            default:
                ViewGroup vGroupText2 = (ViewGroup) mInflater.inflate(R.layout.board_team_member_item, viewGroup, false);
                ViewHolderMember text1 = new ViewHolderMember(vGroupText2);
                return text1;

        }
    }

最后在适配器内检查项目是否为teamMember名称或字母，并显示相应的布局，如下所示：

class Loan{
BigDecimal loanamount;
Date duedate;
----getters and setters
}

class Test
{
void sortLoan()
{
Loan loan1=new Loan();
loan1.setLoanamount(100);
loan1.setDuedate(new Date()); //Jan

Loan loan2=new Loan();
loan2.setLoanamount(100);
loan2.setDuedate(new Date()); //Feb

Loan loan3=new Loan();
loan3.setLoanamount(200);
loan3.setDuedate(new Date()); //Mar

Loan loan4=new Loan();
loan4.setLoanamount(200);
loan4.setDuedate(new Date()); //Apr

Loan loan5=new Loan();
loan5.setLoanamount(200);
loan5.setDuedate(new Date()); //May

Loan loan6=new Loan();
loan6.setLoanamount(100);
loan6.setDuedate(new Date()); //June

Loan loan7=new Loan();
loan7.setLoanamount(100);
loan7.setDuedate(new Date()); //July

List<Loan> loanList=new ArrayList<>();
loanList.add(loan1);
loanList.add(loan2);
loanList.add(loan3);
loanList.add(loan4);
loanList.add(loan5);
loanList.add(loan6);
loanList.add(loan7);

}

Expected output : Loan amount of $100 for 1st 2 months
                  Loan amount of $200 for next 3 months
                  Loan amount of $100 for next 2 months

希望这可以帮到你。一切顺利

Answer 2

按名称排序列表
通过列表和数据迭代，当前的项目第一个字母！=下一个项目的第一个字母时，插入特殊类型的对象。
当项目为“特殊”时，在Adapter地方特殊视图内。

Answer 3

我目前正在使用this。它很容易实现，与RecyclerView适配器兼容，而且轻量级你几乎不称它为库！

Answer 4

比较你的模型并从标题中获得第一个角色....

private void getHeaderListLatter(ArrayList<CountriesModel> usersList) {

        Collections.sort(usersList, new Comparator<CountriesModel>() {
            @Override
            public int compare(CountriesModel user1, CountriesModel user2) {
                return String.valueOf(user1.name.charAt(0)).toUpperCase().compareTo(String.valueOf(user2.name.charAt(0)).toUpperCase());
            }
        });

        String lastHeader = "";

        int size = usersList.size();

        for (int i = 0; i < size; i++) {

            CountriesModel user = usersList.get(i);
            String header = String.valueOf(user.name.charAt(0)).toUpperCase();

            if (!TextUtils.equals(lastHeader, header)) {
                lastHeader = header;
                mSectionList.add(new CountriesModel(header,true));
            }

            mSectionList.add(user);
        }
    }

并在你的适配器getItemViewType布局像这样....

@Override
    public int getItemViewType(int position) {
        if (mCountriesModelList.get(position).isSection) {
            return SECTION_VIEW;
        } else {
            return CONTENT_VIEW;
        }
    }

完整参考。 https://github.com/sayanmanna/LetterSectionedRecyclerView

Answer 5

您可以使用此library来实现它。

有一个关于如何添加标题的完整示例here。

如果你想实现搜索功能，还有一个完整的例子here，这就是结果：

Answer 6

https://github.com/emilsjolander/StickyListHeaders 我希望这就是你想要的。

显示名称列表在Recyclerview下的每个字母下按字母顺序Android

6 个答案: