Android 11得到联系人的生日

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

String[] projection = {
    ContactsContract.Data.CONTACT_ID,
    ContactsContract.CommonDataKinds.Event.START_DATE
};

String selection = ContactsContract.Data.MIMETYPE + " = ? AND " +
    ContactsContract.CommonDataKinds.Event.TYPE + " = ?";

String[] selectionArgs = new String[] {
    ContactsContract.CommonDataKinds.Event.CONTENT_ITEM_TYPE,
    String.valueOf(ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY)
};

Cursor cursor = getContentResolver().query(
    ContactsContract.Data.CONTENT_URI,
    projection,
    selection,
    selectionArgs,
    null
);

while (cursor.moveToNext()) {
    long contactId = cursor.getLong(cursor.getColumnIndex(ContactsContract.Data.CONTACT_ID));
    String birthday = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Event.START_DATE));

    // 处理生日信息
    // ...
}

cursor.close();