我创建了一个可扩展的列表视图，当列表视图到达底部时，它会从sqlite加载数据。它再次使用异步任务从sqlite加载另一组数据。此时，标题将使用新数据进行更新，但最新的子视图数据是空的，任何人都可以告诉我如何在新数据加载时更新/刷新可扩展列表适配器。
适配器：
public class DaybookExpandableAdapter extends BaseExpandableListAdapter {
String updatedate = "";
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<Daybooklist>> _listDataChild;
private DatabaseHandler databaseHandler;
boolean isListScrolling;
public DaybookExpandableAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<Daybooklist>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
/*final String childText = (String) getChild(groupPosition, childPosition);
final String childtime = (String) getChild(groupPosition,childPosition);*/
Daybooklist daybooklist = (Daybooklist) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.model_daybook_listitem, null);
}
TextView txtname = (TextView) convertView.findViewById(R.id.tv_daybook_name);
TextView txttime = (TextView) convertView.findViewById(R.id.tv_daybook_time);
TextView day_name = (TextView) convertView.findViewById(R.id.tv_daybook_name);
TextView day_description = (TextView) convertView.findViewById(R.id.tv_daybook_description);
TextView day_type = (TextView) convertView.findViewById(R.id.tv_daybook_type);
TextView day_amount = (TextView) convertView.findViewById(R.id.tv_daybook_amount);
TextView day_usertype = (TextView) convertView.findViewById(R.id.tv_usertype);
TextView day_time = (TextView) convertView.findViewById(R.id.tv_daybook_time);
ImageView day_check = (ImageView) convertView.findViewById(R.id.img_doneall);
TextView daybook_location = (TextView) convertView.findViewById(R.id.tv_daybook_location);
txtname.setText(daybooklist.getName());
txttime.setText(daybooklist.getCtime());
databaseHandler = new DatabaseHandler(_context);
if (daybooklist.getUsertype() != null && !daybooklist.getUsertype().isEmpty()) {
if (daybooklist.getUsertype().startsWith("farmer") | daybooklist.getUsertype().startsWith("singleworker") | daybooklist.getUsertype().startsWith("groupworker") | daybooklist.getUsertype().startsWith("payvehicle")) {
if (daybooklist.getUsertype().startsWith("farmer")) {
day_name.setText(daybooklist.getName());
day_description.setText(daybooklist.getDescription());
String mobno = daybooklist.getMobileno();
Log.e("mobno", mobno);
String locat = String.valueOf(databaseHandler.getfarmerlocation(mobno));
locat = locat.replaceAll("\\[", "").replaceAll("\\]", "");
Log.e("farmerlocation", locat);
daybook_location.setText(locat);
day_type.setText(daybooklist.getType());
if (daybooklist.getName() != null && daybooklist.getName().startsWith("no")) {
day_name.setText(" ");
} else if (daybooklist.getDescription() != null && daybooklist.getDescription().startsWith("no")) {
day_description.setText(" ");
}
day_amount.setText("\u20B9" + daybooklist.getExtraamt());
if (daybooklist.getAmountout().startsWith("0.0") | daybooklist.getAmountout().startsWith("0")) {
// day_amount.setTextColor(activity.getResources().getColor(R.color.green));
Log.e("Amountout", daybooklist.getAmountout());
day_check.setVisibility(View.INVISIBLE);
} else {
// day_amount.setTextColor(activity.getResources().getColor(R.color.album_title));
Log.e("Amountout", daybooklist.getAmountout());
day_check.setVisibility(View.VISIBLE);
}
day_time.setText(daybooklist.getCtime());
} else {
day_name.setText(daybooklist.getName());
day_description.setText(daybooklist.getDescription());
daybook_location.setText(daybooklist.getType());
day_type.setText(daybooklist.getType());
if (daybooklist.getName() != null && daybooklist.getName().startsWith("no")) {
day_name.setText(" ");
} else if (daybooklist.getDescription() != null && daybooklist.getDescription().startsWith("no")) {
day_description.setText(" ");
}
day_amount.setText("\u20B9" + daybooklist.getExtraamt());
if (daybooklist.getAmountout().startsWith("0.0") | daybooklist.getAmountout().startsWith("0")) {
// day_amount.setTextColor(activity.getResources().getColor(R.color.green));
Log.e("Amountout", daybooklist.getAmountout());
day_check.setVisibility(View.INVISIBLE);
} else {
// day_amount.setTextColor(activity.getResources().getColor(R.color.album_title));
Log.e("Amountout", daybooklist.getAmountout());
day_check.setVisibility(View.VISIBLE);
}
day_time.setText(daybooklist.getCtime());
}
} else if (daybooklist.getUsertype().startsWith("advancefarmer") | daybooklist.getUsertype().startsWith("workeradvance") | daybooklist.getUsertype().startsWith("kgroupadvance") | daybooklist.getUsertype().startsWith("otherexpense") | daybooklist.getUsertype().startsWith("vehicle")) {
if (daybooklist.getUsertype().startsWith("advancefarmer")) {
day_name.setText(daybooklist.getName());
day_description.setText(daybooklist.getDescription());
day_type.setText(daybooklist.getType());
String mobno = daybooklist.getMobileno();
Log.e("mobno", mobno);
String locat = String.valueOf(databaseHandler.getfarmerlocation(mobno));
locat = locat.replaceAll("\\[", "").replaceAll("\\]", "");
Log.e("farmerlocation", locat);
daybook_location.setText(locat);
if (daybooklist.getName() != null && daybooklist.getName().startsWith("no")) {
day_name.setText(" ");
} else if (daybooklist.getDescription() != null && daybooklist.getDescription().startsWith("no")) {
day_description.setText(" ");
}
Log.e("amountout", daybooklist.getAmountout());
day_amount.setText("\u20B9" + daybooklist.getAmountout());
day_time.setText(daybooklist.getCtime());
} else {
day_name.setText(daybooklist.getName());
day_description.setText(daybooklist.getType());
day_type.setText(daybooklist.getType());
daybook_location.setText(daybooklist.getDescription());
if (daybooklist.getName() != null && daybooklist.getName().startsWith("no")) {
day_name.setText(" ");
} else if (daybooklist.getDescription() != null && daybooklist.getDescription().startsWith("no")) {
day_description.setText(" ");
}
Log.e("amountout", daybooklist.getAmountout());
day_amount.setText("\u20B9" + daybooklist.getAmountout());
day_time.setText(daybooklist.getCtime());
}
} else if (daybooklist.getUsertype().startsWith("buyer")) {
day_name.setText(daybooklist.getName());
day_description.setText(daybooklist.getDescription());
day_amount.setText("\u20B9" + daybooklist.getAmountin());
day_type.setText(" ");
day_time.setText(daybooklist.getCtime());
daybook_location.setText(daybooklist.getType());
}
if (daybooklist.getUsertype().startsWith("farmer")) {
day_usertype.setText("F");
day_usertype.setBackgroundResource(R.drawable.textview_farmer);
} else if (daybooklist.getUsertype().startsWith("advancefarmer")) {
day_usertype.setText("FA");
day_usertype.setBackgroundResource(R.drawable.textview_farmer);
} else if (daybooklist.getUsertype().startsWith("singleworker")) {
day_usertype.setText("W");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("workeradvance")) {
day_usertype.setText("WA");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("groupworker")) {
day_usertype.setText("G");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("kgroupadvance")) {
day_usertype.setText("GA");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("otherexpense")) {
day_usertype.setText("E");
day_usertype.setBackgroundResource(R.drawable.textview_otherexpense);
} else if (daybooklist.getUsertype().startsWith("vehicle")) {
day_usertype.setText("V");
day_usertype.setBackgroundResource(R.drawable.textview_vehicle);
} else if (daybooklist.getUsertype().startsWith("gsalary")) {
day_usertype.setText("GS");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("isalary")) {
day_usertype.setText("WS");
day_usertype.setBackgroundResource(R.drawable.textview_worker);
} else if (daybooklist.getUsertype().startsWith("payvehicle")) {
day_usertype.setText("VP");
day_usertype.setBackgroundResource(R.drawable.textview_vehicle);
} else if (daybooklist.getUsertype().startsWith("buyer")) {
day_usertype.setText("B");
day_usertype.setBackgroundResource(R.drawable.textview_buyer);
}
}
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
final String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.model_daybook_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.tv_daybook_date);
final ImageView img_pdg = (ImageView) convertView.findViewById(R.id.img_printpdf);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
String strDate = headerTitle;
SimpleDateFormat dateFormat = new SimpleDateFormat("ddMMMyyyy");
try {
Date varDate = dateFormat.parse(strDate);
dateFormat = new SimpleDateFormat("yyyy-MM-dd");
updatedate = dateFormat.format(varDate);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
img_pdg.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
img_pdg.setColorFilter(ContextCompat.getColor(_context, R.color.colorAccent));
break;
case MotionEvent.ACTION_UP:
img_pdg.clearColorFilter();
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
_context);
// set title
alertDialogBuilder.setTitle(R.string.app_name);
// set dialog message
alertDialogBuilder
.setMessage(_context.getResources().getString(R.string.daybookreport) + headerTitle)
.setCancelable(true)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, close
// current activity
Intent pdfreport = new Intent(_context, Activity_Daybookpdf.class);
pdfreport.putExtra("date", updatedate);
_context.startActivity(pdfreport);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, just close
// the dialog box and do nothing
img_pdg.clearColorFilter();
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
Button nbutton = alertDialog.getButton(DialogInterface.BUTTON_NEGATIVE);
nbutton.setTextColor(_context.getResources().getColor(R.color.colorAccent));
Button pbutton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
pbutton.setBackgroundColor(_context.getResources().getColor(R.color.colorAccent));
pbutton.setPadding(0, 10, 10, 0);
pbutton.setTextColor(Color.WHITE);
break;
}
return true;
}
});
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
img_pdg.setColorFilter(ContextCompat.getColor(_context, R.color.colorAccent));
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
_context);
// set title
alertDialogBuilder.setTitle(R.string.app_name);
// set dialog message
alertDialogBuilder
.setMessage(_context.getResources().getString(R.string.daybookreport) + headerTitle)
.setCancelable(true)
.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, close
// current activity
Intent pdfreport = new Intent(_context, Activity_Daybookpdf.class);
pdfreport.putExtra("date", updatedate);
_context.startActivity(pdfreport);
}
})
.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, just close
// the dialog box and do nothing
img_pdg.clearColorFilter();
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
Button nbutton = alertDialog.getButton(DialogInterface.BUTTON_NEGATIVE);
nbutton.setTextColor(_context.getResources().getColor(R.color.colorAccent));
Button pbutton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
pbutton.setBackgroundColor(_context.getResources().getColor(R.color.colorAccent));
pbutton.setPadding(0, 10, 10, 0);
pbutton.setTextColor(Color.WHITE);
}
});
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public void setTransactionList(List<String> newList, HashMap<String, List<Daybooklist>> childlist) {
_listDataHeader.clear();
_listDataChild.clear();
_listDataHeader = newList;
_listDataChild = childlist;
notifyDataSetChanged();
}
public void setVTransactionList(List<String> newList) {
_listDataHeader = newList;
notifyDataSetChanged();
}
public void isScrolling(boolean isScroll) {
isListScrolling = isScroll;
Log.e("scrollcheck", String.valueOf(isListScrolling));
}
}
异步任务：
class LoadDataTask extends AsyncTask<String, Void, String> {
Daybooklist daybooklist = new Daybooklist();
@Override
protected String doInBackground(String... olimits) {
String limits = null;
kickstart = 2;
olimit=20;
Log.e("kickcheck", String.valueOf(kickstart));
loadingMore = true;
try {
limits = olimits[0];
Log.e("limitscheck",limits);
daybooks = new ArrayList<Daybook>();
daybooks = databaseHandler.getAlldaybookentriesdatewise(olimit);
daybooklists = new ArrayList<Daybooklist>();
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<Daybooklist>>();
for (int i = 0; i < daybooks.size(); i++) {
String date = daybooks.get(i).getDate();
if (date != null) {
String s = date;
String[] spiliter = s.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+", "");
}
listDataHeader.add(disorderedlist);
}
chid = new ArrayList<Daybooklist>();
daybooklists = databaseHandler.getAllDaywisedaybookdetails(date);
for (int j = 0; j < daybooklists.size(); j++) {
String name = daybooklists.get(j).getName();
String desc = daybooklists.get(j).getDescription();
String type = daybooklists.get(j).getType();
String usertype = daybooklists.get(j).getUsertype();
String amtin = daybooklists.get(j).getAmountin();
String amtout = daybooklists.get(j).getAmountout();
String extamt = daybooklists.get(j).getExtraamt();
String mobno = daybooklists.get(j).getMobileno();
String dates = daybooklists.get(j).getSdate();
String time = daybooklists.get(j).getCtime();
if (name != null) {
chid.add(new Daybooklist(name, desc, type, usertype, amtin, amtout, extamt, mobno, dates, time));
}
}
listDataChild.put(listDataHeader.get(i), chid);
}
} catch (Exception e) {
e.printStackTrace();
}
return disorderedlist;
}
@Override
protected void onPostExecute(String disorderedlist) {
// listAdapter = new DaybookExpandableAdapter(getApplicationContext(), listDataHeader, listDataChild);
listAdapter.setTransactionList(listDataHeader,listDataChild);
loadingMore = false;
}
@Override
protected void onCancelled() {
// Notify the loading more operation has finished
loadingMore = false;
}
}
适配器通知：
public void setTransactionList(List<String> newList, HashMap<String, List<Daybooklist>> childlist) {
_listDataHeader.clear();
_listDataChild.clear();
_listDataHeader = newList;
_listDataChild = childlist;
notifyDataSetChanged();
}
数据库：
public ArrayList<Daybook> getAlldaybookentriesdatewise(int s) {
ArrayList<Daybook> daybookDetails = new ArrayList<Daybook>();
String selectquery = "SELECT date,IFNULL(SUM(amountin),0) as amountin,IFNULL(SUM(amountout),0) as amountout,daybookusertype FROM daybookdetails GROUP BY strftime('%Y-%m-%d',date) ORDER BY strftime('%Y-%m-%d',date) DESC LIMIT " + s + "";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectquery, null);
if (cursor.moveToFirst()) {
do {
Daybook daybookentries = new Daybook();
daybookentries.setDate(cursor.getString(0));
daybookentries.setCashin(cursor.getString(1));
daybookentries.setCashout(cursor.getString(2));
daybookDetails.add(daybookentries);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return daybookDetails;
}
我已经尝试过使用notifydatasetchanged但它没有用。
答案 0 :(得分：0)
您需要在onPostExecute()方法中的视图中设置适配器：
protected void onPostExecute(String disorderedlist) {
listAdapter = new DaybookExpandableAdapter(getApplicationContext(), listDataHeader, listDataChild);
listView.setAdapter(listAdapter);
listAdapter.setTransactionList(listDataHeader,listDataChild);
loadingMore = false;
}