如何在可扩展的listview android中将孩子添加到特定的父母
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【中文标题】如何在可扩展的listview android中将孩子添加到特定的父母【英文标题】：How to add a child to particular parent in expandable listview android 【发布时间】：2017-05-27 21:58:07 【问题描述】：我创建了一个应用程序，在该应用程序中，我通过将限制设置为 10 从 sqlite 加载数据，当列表向下滚动时，它在这部分中使用异步任务从 sqlite 加载另外 10 个数据，我已获取标题组为以及子数据，但我不知道如何为新日期放置一个孩子，谁能告诉我如何在可扩展列表视图中将孩子添加到特定父级
异步任务：
class LoadDataTask extends AsyncTask<String, Void, String>
ArrayList<Daybook> daybooks1 = new ArrayList<Daybook>();
@Override
protected String doInBackground(String... olimits)
String limits = null;
loadingMore = true;
try
limits = olimits[0];
grouplistDataHeader = new ArrayList<String>();
grouplistDataChild = new HashMap<String, List<Daybooklist>>();
groupdaybooklists = new ArrayList<Daybooklist>();
databasehandler = new DatabaseHandler(getApplicationContext());
loadeddate = new ArrayList<String>();
String selectquery = "SELECT date,IFNULL(SUM(amountin),0) as amountin,IFNULL(SUM(amountout),0),daybookusertype as amountout FROM daybookdetails GROUP BY strftime('%Y-%m-%d',date) ORDER BY strftime('%Y-%m-%d',date) DESC LIMIT 11,20";
SQLiteDatabase db = databasehandler.getReadableDatabase();
Cursor cursor = db.rawQuery(selectquery, null);
if (cursor.moveToFirst())
do
loadeddate.add(cursor.getString(0));
for (String s : loadeddate)
newdate = s;
String[] spiliter = newdate.split("-");
String year = spiliter[0];
String month = spiliter[1];
String dates = spiliter[2];
if (month.startsWith("01"))
disorderedlist = dates + "Jan" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("02"))
disorderedlist = dates + "Feb" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("03"))
disorderedlist = dates + "Mar" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("04"))
disorderedlist = dates + "Apr" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("05"))
disorderedlist = dates + "May" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("06"))
disorderedlist = dates + "Jun" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("07"))
disorderedlist = dates + "Jul" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("08"))
disorderedlist = dates + "Aug" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("09"))
disorderedlist = dates + "Sep" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("10"))
disorderedlist = dates + "Oct" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("11"))
disorderedlist = dates + "Nov" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("12"))
disorderedlist = dates + "Dec" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
for (int i = 0; i < daybooks1.size(); i++)
listDataHeader.add(disorderedlist);
groupdaybooklists = databaseHandler.getAllDaywisedaybookdetails(newdate);
for (int j = 0; j < groupdaybooklists.size(); j++)
String name = groupdaybooklists.get(j).getName();
String desc = groupdaybooklists.get(j).getDescription();
String type = groupdaybooklists.get(j).getType();
String usertype = groupdaybooklists.get(j).getUsertype();
String amtin = groupdaybooklists.get(j).getAmountin();
String amtout = groupdaybooklists.get(j).getAmountout();
String extamt = groupdaybooklists.get(j).getExtraamt();
String mobno = groupdaybooklists.get(j).getMobileno();
String datess = groupdaybooklists.get(j).getSdate();
String time = groupdaybooklists.get(j).getCtime();
chid.add(new Daybooklist(name, desc, type, usertype, amtin, amtout, extamt, mobno, datess, time));
listDataChild.put(listDataHeader.get(i), chid);
while (cursor.moveToNext());
cursor.close();
db.close();
catch (Exception e)
e.printStackTrace();
return disorderedlist;
@Override
protected void onPostExecute(String disorderedlist)
listAdapter.notifyDataSetChanged();
loadingMore = false;
我感到困惑的部分：
@Override
protected String doInBackground(String... olimits)
String limits = null;
loadingMore = true;
try
limits = olimits[0];
grouplistDataHeader = new ArrayList<String>();
grouplistDataChild = new HashMap<String, List<Daybooklist>>();
groupdaybooklists = new ArrayList<Daybooklist>();
databasehandler = new DatabaseHandler(getApplicationContext());
loadeddate = new ArrayList<String>();
String selectquery = "SELECT date,IFNULL(SUM(amountin),0) as amountin,IFNULL(SUM(amountout),0),daybookusertype as amountout FROM daybookdetails GROUP BY strftime('%Y-%m-%d',date) ORDER BY strftime('%Y-%m-%d',date) DESC LIMIT 11,20";
SQLiteDatabase db = databasehandler.getReadableDatabase();
Cursor cursor = db.rawQuery(selectquery, null);
if (cursor.moveToFirst())
do
loadeddate.add(cursor.getString(0));
for (String s : loadeddate)
newdate = s;
String[] spiliter = newdate.split("-");
String year = spiliter[0];
String month = spiliter[1];
String dates = spiliter[2];
if (month.startsWith("01"))
disorderedlist = dates + "Jan" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("02"))
disorderedlist = dates + "Feb" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("03"))
disorderedlist = dates + "Mar" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("04"))
disorderedlist = dates + "Apr" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("05"))
disorderedlist = dates + "May" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("06"))
disorderedlist = dates + "Jun" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("07"))
disorderedlist = dates + "Jul" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("08"))
disorderedlist = dates + "Aug" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("09"))
disorderedlist = dates + "Sep" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("10"))
disorderedlist = dates + "Oct" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("11"))
disorderedlist = dates + "Nov" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
else if (month.startsWith("12"))
disorderedlist = dates + "Dec" + year;
disorderedlist = disorderedlist.replaceAll("\\s+", "");
for (int i = 0; i < daybooks1.size(); i++)
listDataHeader.add(disorderedlist);
groupdaybooklists = databaseHandler.getAllDaywisedaybookdetails(newdate);
for (int j = 0; j < groupdaybooklists.size(); j++)
String name = groupdaybooklists.get(j).getName();
String desc = groupdaybooklists.get(j).getDescription();
String type = groupdaybooklists.get(j).getType();
String usertype = groupdaybooklists.get(j).getUsertype();
String amtin = groupdaybooklists.get(j).getAmountin();
String amtout = groupdaybooklists.get(j).getAmountout();
String extamt = groupdaybooklists.get(j).getExtraamt();
String mobno = groupdaybooklists.get(j).getMobileno();
String datess = groupdaybooklists.get(j).getSdate();
String time = groupdaybooklists.get(j).getCtime();
chid.add(new Daybooklist(name, desc, type, usertype, amtin, amtout, extamt, mobno, datess, time));
listDataChild.put(listDataHeader.get(i), chid);
while (cursor.moveToNext());
cursor.close();
db.close();
catch (Exception e)
e.printStackTrace();
return disorderedlist;
【问题讨论】：
您能否发布数据在 sqlite 中的存储方式的快照 您应该在每组子列表中添加（一个额外的子加载更多类型）作为最后一个子。并在 getChildView() 方法中添加条件来检查行是子类型还是加载更多类型。 请查看之前的回复：http://***.com/a/15348971/2153132 【参考方案1】：需要在onCreate方法里面初始化listView的适配器：
listView.setAdapter(adapter); // Pode ser com as listas vazias
之后，在后台方法中，您只需要加载数据并保存在某个类属性中。之后，在onPostResult方法中，需要更新适配器并通知listView：
protected void onPostExecute(String disorderedlist)
adapter.addGroupList(groupList); // Need to implement the method in the adapter
adapter.addChildList(childList); // Need to implement the method in the adapter
adapter.notifyDataSetChanged();
loadingMore = false;
就是这个意思，换你的逻辑吧。
【讨论】：
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