Android获取手机通讯录信息

 public void ReadContacts() {

        List list = new ArrayList<>();
        Cursor cursor = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,
                null, null, null, null);
        int contactIdIndex = 0;
        int nameIndex = 0;

        if (cursor.getCount() > 0) {
            contactIdIndex = cursor.getColumnIndex(ContactsContract.Contacts._ID);
            nameIndex = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
        }
        while (cursor.moveToNext()) {
            String contactId = cursor.getString(contactIdIndex);
            String name = cursor.getString(nameIndex);
            /*
             * 查找该联系人的phone信息
             */
            Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                    null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactId,
                    null, null);
            int phoneIndex = 0;
            if (phones.getCount() > 0) {
                phoneIndex = phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
            }
            String phoneNumber = "";
            while (phones.moveToNext()) {
                phoneNumber = phones.getString(phoneIndex);
            }
            /*
             * 查找该联系人的email信息
             */
            Cursor emails = getContentResolver().query(ContactsContract.CommonDataKinds.Email.CONTENT_URI,
                    null,
                    ContactsContract.CommonDataKinds.Email.CONTACT_ID + "=" + contactId,
                    null, null);
            int emailIndex = 0;
            if (emails.getCount() > 0) {
                emailIndex = emails.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA);
            }
            String email = "";
            while (emails.moveToNext()) {
                email = emails.getString(emailIndex);
            }
            String firstLetter = FirstLetterUtil.getFirstLetter(name);

            String info;
            if (TextUtils.isEmpty(email)) {
                info = phoneNumber;
            } else {
                info = phoneNumber + "," + email;
            }
            Contact contact = new Contact(firstLetter, name, info);
            list.add(contact);
        }
        contacts.addAll(list);
    }