Question

我在计算与google方向api的距离后尝试在展开列表视图中显示该项目但是它给出了空列表，但是当点击搜索按钮时它会显示。请建议我摆脱这个问题

public List<SqliteServiceCenterListData> getAllInfo(String countryName, final String userLocationLatitude, final String userLocationLongitude) {
            final List<SqliteServiceCenterListData> dataList = new ArrayList<>();
            SQLiteDatabase db = this.getWritableDatabase();
            String selectQuery = "SELECT * FROM service_center_info WHERE  country_name=?";
            final Cursor cursor = db.rawQuery(selectQuery, new String[]{countryName.trim()});
            cursor.moveToFirst();
            while (cursor.isAfterLast() == false) {
                final SqliteServiceCenterListData sqliteServiceCenterListData = new SqliteServiceCenterListData();
                sqliteServiceCenterListData.setCountryId(cursor.getString(1));
                sqliteServiceCenterListData.setZoneId(cursor.getString(2));
                sqliteServiceCenterListData.setCityId(cursor.getString(3));
                sqliteServiceCenterListData.setServiceCenterId(cursor.getString(4));
                sqliteServiceCenterListData.setCountryName(cursor.getString(5));
                sqliteServiceCenterListData.setZoneName(cursor.getString(6));
                sqliteServiceCenterListData.setCityName(cursor.getString(7));
                sqliteServiceCenterListData.setServiceCenterName(cursor.getString(8));
                sqliteServiceCenterListData.setOpeningTime(cursor.getString(9));
                sqliteServiceCenterListData.setClosingTime(cursor.getString(10));
                sqliteServiceCenterListData.setLocation(cursor.getString(11));
                sqliteServiceCenterListData.setContact(cursor.getString(12));
                sqliteServiceCenterListData.setContactPerson(cursor.getString(13));
                sqliteServiceCenterListData.setLatitude(cursor.getString(14));
                sqliteServiceCenterListData.setLongitude(cursor.getString(15));
                if (new ConnectionManager(context).isConnectionToInternet()) {
                    new AsyncTask<Void, Void, Void>() {
                        @Override
                        protected Void doInBackground(Void... params) {
                            new GetDistanceFromServer(context, String.valueOf(userLocationLatitude), String.valueOf(userLocationLongitude), sqliteServiceCenterListData.getLatitude(), sqliteServiceCenterListData.getLongitude()).getDistanceFromServer(new DistanceInfoHolder() {
                                @Override
                                public void setDistance(String distance) {
                                    Log.e("Distance", distance);
                                    sqliteServiceCenterListData.setDistances(distance);
                                    dataList.add(sqliteServiceCenterListData);
                                }
                            });
                            return null;
                        }
                    }.execute();
                } else {
                    dataList.add(sqliteServiceCenterListData);
                }
                cursor.moveToNext();
            }
            cursor.close();
            db.close();
            return dataList;
        }

Answer 1

将此代码放在适配器的getGroupView中

((ExpandableListView) parent).expandGroup(groupPosition);

expandable listview在初始阶段没有显示任何数据。但点击按钮后显示

1 个答案: