我正在创建一个Android应用程序，其中我使用了可扩展的listview，其中我想设置一个限制，在可扩展listview中首先只显示10个数据。在listview到达end它将从该加载另外10个数据加载组数据的数据库工作正常，但对于子视图，它工作不正常，任何人都可以告诉我如何让子视图在可扩展列表视图中显示加载的项目。
加载数据的后台进程：
private class LoadDataTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
loadingMore = true;
// showDialog(progress_bar_type);
}
@Override
protected Void doInBackground(Void... params) {
if (isCancelled()) {
return null;
}
Log.e("test2", "reached");
// Simulates a background task
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
Log.e("test3", "starting");
databasehandler = new DatabaseHandler(getApplicationContext());
if (olimit > totalcount) {
// olimit = 1;
// olimit = 2;
} else {
olimit = olimit + 10;
}
listDataHeader = new ArrayList<String>();
databasehandler = new DatabaseHandler(getApplicationContext());
listDataHeader = 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 '" + olimit + "'";
SQLiteDatabase db = databasehandler.getReadableDatabase();
Cursor cursor = db.rawQuery(selectquery, null);
if (cursor.moveToFirst()) {
do {
loadeddate = cursor.getString(0);
String s = loadeddate;
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(loadeddate);
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 datess = daybooklists.get(j).getSdate();
String time = daybooklists.get(j).getCtime();
Log.e("ctime", time);
chid.add(new Daybooklist(name, desc, type, usertype, amtin, amtout, extamt, mobno, datess, time));
}
listDataChild.put(String.valueOf(listDataHeader), chid);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return null;
}
@Override
protected void onPostExecute(Void result) {
listAdapter.setTransactionList(listDataHeader, listDataChild);
loadingMore = false;
// dismissDialog(progress_bar_type);
super.onPostExecute(result);
}
@Override
protected void onCancelled() {
// Notify the loading more operation has finished
loadingMore = false;
}
}
可扩展ListAdapter：
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
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;
}
});
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 = newList;
_listDataChild = childlist;
notifyDataSetChanged();
}
public void isScrolling(boolean isScroll) {
isListScrolling = isScroll;
Log.e("scrollcheck", String.valueOf(isListScrolling));
}
}
问题：
listDataChild.put(String.valueOf(listDataHeader), chid);
任何人都可以告诉我我必须在这里改变什么
答案 0 :(得分：0)
尝试这可能会对您有所帮助：
首先定义此变量以保存状态：
private boolean loadMore = true;
private int pastVisiblesItems, visibleItemCount, totalItemCount;
然后为listView设置滚动侦听器：
listView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView absListView, int i) {
}
@Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
visibleItemCount = listView.getChildCount();
totalItemCount = listView.getCheckedItemCount();
pastVisiblesItems = listView.getFirstVisiblePosition();
if (loadMore) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
soundListSearch.add(null);
new LoadDataTask().execute();
}
}
}
});
最后loadMore=false要防止加载更多数据（例如，当AsyncTask中捕获异常或数据查询结束或......时）
编辑1以添加到listDataChild HashMap
不，它不正确。你应该这样使用 listDataChild.put(listDataHeader.get(position), chid);
因为listDataChild的第一个值应为string type，但您尝试设置一个arrayList
将listDataChild的所有项目添加到listDataChild中执行此操作：
for (int i =0 ; i<listDataHeader.size();i++)
{
listDataChild.put(listDataHeader.get(i), chid);
}