如何将联系人导出到 vcard?

How do I export contacts to vcard?

在 android 中是否有任何通用方法可以将联系人信息导出到 vcard 3.0 文件?我目前正在做一个学校项目,我想将所有本地联系人表单 android 和 ios 上传到网络服务,以便更轻松地从 android 到 android、android 到 ios,反之亦然。

然而,不幸的是,在Android中,一次获取所有联系信息是相当困难的,因此,我想有一个通用的方法(例如,一些联系人没有个人资料照片,而其他人做)。

我遇到过一些变体来解决这个问题,但是,我不喜欢它们。

这是我当前检索联系人的代码:

public  void getAndroidContacts(){

    // get contacts
    Cursor cursor_android_contacts = null;
    ContentResolver contentResolver = getContentResolver();

    try {
        cursor_android_contacts = contentResolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
    }catch (Exception e) {
        Log.e("Error on contact", e.getMessage());
    }

    // check hasContacts
    if (cursor_android_contacts.getCount()>0){
        while (cursor_android_contacts.moveToNext()){
            ContactSerializer.Android_Contact android_contact = new ContactSerializer.Android_Contact();

            // Get Name & Contact_ID
            String display_name=cursor_android_contacts.getString(cursor_android_contacts.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String contact_ID = cursor_android_contacts.getString(cursor_android_contacts.getColumnIndex(ContactsContract.CommonDataKinds.Phone._ID));

            android_contact.android_contact_ID = Integer.parseInt(contact_ID);
            android_contact.android_contact_name = display_name;

            // get Number
            int hasPhoneNumber = Integer.parseInt(cursor_android_contacts.getString(cursor_android_contacts.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)));
            if (hasPhoneNumber > 0){
                Cursor phoneCursor = contentResolver.query(
                        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                        null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
                        new String[]{contact_ID},
                        null);

                while (phoneCursor.moveToNext()){
                    String phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                    // set number
                    android_contact.android_contact_number = phoneNumber;
                }
                phoneCursor.close();
            }
            ContactSerializer.localContacts.add(android_contact);
        }
        localContactCount = cursor_android_contacts.getCount();
    }// hasContacts
}

使用这段代码,我只得到了id、name和number;我还想知道联系人是否有照片,是私人号码还是公司号码。

感谢您的帮助!

我自己设法做到了,但是,这通常只能为您提供 vCard V2.1:

private void getVcardString() {
    // TODO: 07.11.2017 Fix vCard Version
    vCardArray = new ArrayList<>();
    cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
            null, null, null);
    if (cursor != null && cursor.getCount() > 0) {
        cursor.moveToFirst();
        for (int i = 0; i < cursor.getCount(); i++) {

            String lookupKey = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));
            Uri uri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);
            AssetFileDescriptor fd;
            try {
                fd = this.getContentResolver().openAssetFileDescriptor(uri, "r");
                FileInputStream fis = fd.createInputStream();
                byte[] buf = new byte[(int) fd.getDeclaredLength()];
                fis.read(buf);
                String vCard = new String(buf);
                vCardArray.add(vCard);
                Log.println(Log.ASSERT, "Vcard", vCard);
            } catch (Exception e1) {
                e1.printStackTrace();
            }
            // you could save the file here using a FileOutputStream
            cursor.moveToNext();
        }

    } else {
        Log.d("vCardERROR", "No Contacts in Your Phone");
    }

}