如何在Android中获取联系人的groupId/GroupName？

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.GroupMembership;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Data;
import android.provider.ContactsContract.Groups;
import android.provider.ContactsContract.RawContacts;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ContentResolver contentResolver = getContentResolver();
        Cursor cursor = contentResolver.query(Contacts.CONTENT_URI, null, null, null, null);

        if (cursor != null) {
            while (cursor.moveToNext()) {
                String contactId = cursor.getString(cursor.getColumnIndex(Contacts._ID));
                String displayName = cursor.getString(cursor.getColumnIndex(Contacts.DISPLAY_NAME));

                Cursor groupMembershipCursor = contentResolver.query(Data.CONTENT_URI,
                        new String[]{GroupMembership.GROUP_ROW_ID},
                        Data.CONTACT_ID + "=? AND " + Data.MIMETYPE + "=?",
                        new String[]{contactId, GroupMembership.CONTENT_ITEM_TYPE}, null);

                if (groupMembershipCursor != null) {
                    while (groupMembershipCursor.moveToNext()) {
                        String groupId = groupMembershipCursor.getString(groupMembershipCursor.getColumnIndex(GroupMembership.GROUP_ROW_ID));

                        Cursor groupNameCursor = contentResolver.query(Groups.CONTENT_URI,
                                new String[]{Groups.TITLE},
                                Groups._ID + "=?",
                                new String[]{groupId}, null);

                        if (groupNameCursor != null) {
                            while (groupNameCursor.moveToNext()) {
                                String groupName = groupNameCursor.getString(groupNameCursor.getColumnIndex(Groups.TITLE));
                                System.out.println("Contact Name: " + displayName + ", Group ID: " + groupId + ", Group Name: " + groupName);
                            }
                            groupNameCursor.close();
                        }
                    }
                    groupMembershipCursor.close();
                }
            }
            cursor.close();
        }
    }
}