如何在android应用中访问唯一联系人？

<uses-permission android:name="android.permission.READ_CONTACTS" />

// 定义要查询的联系人字段
String[] projection = {ContactsContract.Contacts._ID, ContactsContract.Contacts.DISPLAY_NAME};

// 查询联系人数据
Cursor cursor = getContentResolver().query(
    ContactsContract.Contacts.CONTENT_URI,
    projection,
    null,
    null,
    null
);

// 遍历查询结果
if (cursor != null && cursor.moveToFirst()) {
    do {
        // 获取联系人ID和姓名
        String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
        String displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

        // 根据联系人ID查询联系人的电话号码
        Cursor phoneCursor = getContentResolver().query(
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
            null,
            ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
            new String[]{contactId},
            null
        );

        // 遍历电话号码查询结果
        if (phoneCursor != null && phoneCursor.moveToFirst()) {
            do {
                // 获取电话号码
                String phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                // 在这里可以对联系人数据进行处理或展示
                // ...

            } while (phoneCursor.moveToNext());
            phoneCursor.close();
        }
    } while (cursor.moveToNext());
    cursor.close();
}