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滾動到達結束時如何在android expandable listview中使用Loadmore數據

[英]How to use Loadmore data in android expandable listview when scroll reaches end

 原文  2017-01-11 08:08:55  8   1    android/ listview/ expandablelistview

問題描述

我正在創建一個Android應用程序，其中我使用了可擴展的listview，其中我想設置一個限制，在可擴展listview中首先只顯示10個數據。在listview到達end它將從數據庫加載另外10個數據加載組的數據工作正常，但對於子視圖，它不能正常工作，任何人都可以告訴我如何使子視圖在可擴展列表視圖中顯示加載的項目。

加載數據的后台進程： 

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;
    }
}

可擴展的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));
}

}

問題： 

  listDataChild.put(String.valueOf(listDataHeader), chid);

任何人都可以告訴我我必須在這里改變什么

1 個解決方案

解決方案1
 0  2017-01-11 08:23:05

試試這可能對你有所幫助：

  1. 首先定義此變量以保存狀態： 

      private boolean loadMore = true; private int pastVisiblesItems, visibleItemCount, totalItemCount;

  2. 然后為listView設置滾動偵聽器： 

      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(); } } } });

  3. 最后loadMore=false ，你想要阻止加載更多數據（例如當AsyncTask中的catch異常或數據查詢結束時......）

編輯1以添加到listDataChild HashMap

不，這不對。 你應該這樣用 

  listDataChild.put(listDataHeader.get(position), chid);

因為listDataChild第一個值應該是string type但是您嘗試設置一個arrayList

將listDataChild所有項添加到listDataChild執行以下操作： 

  for (int i =0 ; i<listDataHeader.size();i++)
    {
         listDataChild.put(listDataHeader.get(i), chid); 
    }

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