如何从Android BaseExpandableListAdapter中的联系人列表中选择联系人

Question

我正在Android上通过点击ExpandableListView中的按钮从电话联系人列表中选择联系人。我的代码在BaseExpandableListAdapter中。

我可以打开联系人列表，但是选择后我无法在onActivityResult中得到结果。请帮我。这是我的代码。

    public class expandableListAdaptor extends BaseExpandableListAdapter {
                private static final int RESULT_PICK_CONTACT =1;
                private TextView phone;
                private  ImageButton btngetContact;
                private Context context;


    public expandableListAdaptor(Context context, List<String> listTitle, HashMap<String, PackageName> expandbleListDetailes) {
            this.context = context;
            ListTitle = listTitle;
            this.expandbleListDetailes = expandbleListDetailes;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
         final PackageName packageName = (PackageName) getChild(groupPosition, childPosition);
        if(convertView==null)
        {
    LayoutInflater layoutInflater = (LayoutInflater)  this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.list_view_2nd, null);


        }



btngetContact = convertView.findViewById(R.id.btnCallphoneNumber);
   phone = convertView.findViewById(R.id.etphoneNumber);


btngetContact.setOnClickListener(new View.OnClickListener() {
                @Override
 public void onClick(View v) {

    Intent intent1 = new Intent(Intent.ACTION_PICK, ContactsContract.CommonDataKinds.Phone.CONTENT_URI);

                    ((Activity)context). startActivityForResult(intent1, RESULT_PICK_CONTACT);
                 }
            });

    return convertView;
    }

这是我的onActivityResult代码。

protected void onActivityResult(int requestCode, int resultCode,  Intent data) {

                       switch (requestCode) {

                    case RESULT_PICK_CONTACT:

                        getSelectedContact (data);

                        break;

                }

     }

    private void getSelectedContact(Intent data) {

            Cursor cursor = null;

            try {

                String phoneNo = null;

                Uri uri = data.getData ();

                cursor = ((Activity)context).getContentResolver ().query (uri, null, null,null,null);

                cursor.moveToFirst ();

                int phoneIndex = cursor.getColumnIndex (ContactsContract.CommonDataKinds.Phone.NUMBER);

                phoneNo = cursor.getString (phoneIndex);

                phone.setText (phoneNo);

            } catch (Exception e) {

                e.printStackTrace ();

            }

        }