Contact alphabetical sorting, fuzzy search, selection

Support sidebar index
Support Chinese, number, letter fuzzy search
Support all select, single select contacts
Support to check whether the contact has been added

Single choice demo

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Multiple choice demo

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Function analysis

Most of the code is relatively simple, so I won't paste it here and take up space. I only analyze a few technical points. You can directly download the source code to observe.

The first question: Chinese characters to pinyin

Depends on tinypinyin library

implementation 'com.github.promeg:tinypinyin:2.0.3'

When you get the first Chinese character and pass it in, it will be automatically converted into pinyin, and then take the first character of pinyin.

Pinyin.toPinyin(name.charAt(0)).toUpperCase().charAt(0)

Second question: how to sort contacts from AZ

In the first question, we got the first letter of each contact, and sorted the contacts in the loop in ascending order through the compareTo of the Comparator

/**
     * 把联系人按照a b c升序排列
     */
    private static ArrayList<ContactInfo> compare(ArrayList<ContactInfo> contactInfos) {
        Collections.sort(contactInfos, new Comparator<ContactInfo>() {
            @Override
            public int compare(ContactInfo o1, ContactInfo o2) {
                //升序排列
                if (o1.getLetter().equals("@")
                        || o2.getLetter().equals("#")) {
                    return -1;
                } else if (o1.getLetter().equals("#")
                        || o2.getLetter().equals("@")) {
                    return 1;
                }
                return o1.getLetter().compareTo(o2.getLetter());
            }
        });
        return contactInfos;
    }

The third question: how to display the classification letters of contacts by alphabet

In the second question, we arranged the contacts in ascending alphabetical order. Here we only need to determine whether the first letters of the contacts are equal, that is, if the first letter of the first contact and the second contact are different, it means that they are not of the same type , This is to display the index letter on the second contact.

public void onBindViewHolder(ContactAdapter.MyViewHodle holder, final int position) {
        ContactInfo contactInfo = mContactList.get(position);
        holder.name.setText(contactInfo.getName());
        holder.phone.setText(contactInfo.getPhone());

        //判断是否显示索引字母
        String currentLetter = contactInfo.getLetter();
        String previousLetter = position >= 1 ? mContactList.get(position - 1).getLetter() : "";
        if (!TextUtils.equals(currentLetter, previousLetter)) {
            holder.letter.setVisibility(View.VISIBLE);
            holder.letter.setText(currentLetter);
        } else {
            holder.letter.setVisibility(View.GONE);
        }
        .....省略.....
    }

The fourth question: How to search for contacts

Get all the contacts first, and then search again, put the searched contacts into another collection, and then send it to RecycleView to notify the refresh

/**
     * 搜索联系人
     *
     * @param searchKey 搜索key
     */
    private void searchContacts(String searchKey) {
        for (ContactInfo info : mContactList) {
            if (ContactsUtils.searchContact(searchKey, info)) {
                mSearchList.add(info);
            }
        }
    }

/**
     * 模糊搜索（按中文，数字，字母搜索）
     */
    public static boolean searchContact(String searchStr, ContactInfo info) {
        return info.getName().contains(searchStr) || info.getPhone().contains(searchStr)
                || searchLowerByAlphabet(searchStr, info) || searchUpperByAlphabet(searchStr, info)
                || Pinyin.toPinyin(info.getName(), "").toLowerCase().contains(searchStr)
                || Pinyin.toPinyin(info.getName(), "").toUpperCase().contains(searchStr);
    }