BaseExpandableListAdapter 以编程方式添加子项

【问题标题】：BaseExpandableListAdapter add child programmaticallyBaseExpandableListAdapter 以编程方式添加子项
【发布时间】：2013-11-08 04:42:04
【问题描述】：

我正在尝试以编程方式将孩子添加到父级。那只是没有尝试，没有任何效果。

我的代码：

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private List<String> _listDataHeader; 
private HashMap<String, List<String>> _listDataChild;

........

     public void addChild(int groupPosition, String name){
        List<String> childs = _listDataChild.get(_listDataHeader.get(groupPosition));
        childs.add(name);
        _listDataChild.put(_listDataHeader.get(groupPosition), childs);

        notifyDataSetChanged(); 
    }

和

groupPosition = 0
addChild(groupPosition, "lalala");

返回错误；

11-08 15:33:06.143: E/AndroidRuntime(27857): FATAL EXCEPTION: main
11-08 15:33:06.143: E/AndroidRuntime(27857): java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
11-08 15:33:06.143: E/AndroidRuntime(27857):    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
11-08 15:33:06.143: E/AndroidRuntime(27857):    at java.util.ArrayList.get(ArrayList.java:304)
11-08 15:33:06.143: E/AndroidRuntime(27857):    at com.example.pagereader.ExpandableListAdapter.getChildView(ExpandableListAdapter.java:95)
11-08 15:33:06.143: E/AndroidRuntime(27857):    at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:450)
11-08 15:33:06.143: E/AndroidRuntime(27857):    at android.widget.AbsListView.obtainView(AbsListView.java:2088)
...

请帮帮我。

【问题讨论】：

    标签： java android expandablelistview


    【解决方案1】：

    在这里..

    我有班级名称SortCategoryExpand

    我在其中初始化了 ExpandableListAdapter

    expListAdapter = new ExpandableListAdapter(getApplicationContext());

            expListAdapter.setupTrips(aryAbsence,aryTicket,aryTimeSheet); // Mathod in ExpandableListAdapter class and data in aryLists.

            expList.setAdapter(expListAdapter);

            if (expListAdapter.getChildrenCount(0) >= 1) {
                expList.expandGroup(0);
            }

    现在是 ExpandableListAdapter 类

    公共类 ExpandableListAdapter 扩展 BaseExpandableListAdapter {

    /*
 * view types
 */
SortCategoryExpand sortCategoryExpand = new SortCategoryExpand();

private static final int VIEW_1 = 0;
private static final int View_2 = 1;
private static final int View_3=2;

/*
 * data
 */
private Context context = null;
ArrayList<Group> groups = new ArrayList<Group>();

public ExpandableListAdapter(Context context) {
    this.context = context;
}

@Override
public int getChildType(int groupPosition, int childPosition) {
    int type = -1;

    if (groupPosition == 2) {
        type = View_3;
    }
    else if (groupPosition == 1) {
        type = View_2;
    }else  {
        type = View_1;
    }

    return type;
}

@Override
public int getChildTypeCount() {
    // Past and Future Travel Plans
    return 3;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return groups.get(groupPosition).entryItems.get(childPosition);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

    // get the type of the group this child belongs
    Type viewType = groups.get(groupPosition).type;
    View view = convertView;

    if (viewType == Type.Data1) {
        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.category_absence_line_item, parent, false);

            Data1ViewHolder holder = new Data1ViewHolder ();
            holder.txtSubject = (TextView) view.findViewById(R.id.subject);
            holder.txtFromUser = (TextView) view.findViewById(R.id.user);
            holder.txtStartDate = (TextView) view
                    .findViewById(R.id.startDate);
            holder.txtEndDate = (TextView) view.findViewById(R.id.endDate);

            view.setTag(holder);
        }

        Data1ViewHolder holder = (Data1ViewHolder ) view.getTag();

        EntryItem entryItem = (EntryItem) getChild(groupPosition,
                childPosition);

        if (entryItem.subject.equals("None")) {
            holder.txtSubject.setText("None");
        } else {

            holder.txtSubject.setText("" + entryItem.subject);
        }
        if (entryItem.fromUser.equals("None")) {
            holder.txtFromUser.setText("");
        } else if (entryItem.fromUser.equals("anyType{}")) {
            holder.txtFromUser.setText("From User : ");
        } else {
            holder.txtFromUser.setText("From User : " + entryItem.fromUser);
        }
        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.startDate)
                .equals("01-Jan-1970")) {
            holder.txtStartDate.setText("Start Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.startDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtStartDate.setText("Start Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.startDate));
        }

        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.endDate)
                .equals("01-Jan-1970")) {
            holder.txtEndDate.setText("Due Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.endDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtEndDate.setText("Due Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.endDate));
        }
    }else ifviewType == Type.Data2){

        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.category_ticket_line_item, parent, false);

            Data2ViewHolder holder = new Data2ViewHolder ();
            holder.txtSubject = (TextView) view.findViewById(R.id.subject);
            holder.txtFromUser = (TextView) view.findViewById(R.id.user);
            holder.txtStartDate = (TextView) view
                    .findViewById(R.id.startDate);
            holder.txtEndDate = (TextView) view.findViewById(R.id.endDate);

            view.setTag(holder);
        }

        Data2ViewHolder holder = (Data2ViewHolder ) view.getTag();

        EntryItem entryItem = (EntryItem) getChild(groupPosition,
                childPosition);

        if (entryItem.subject.equals("None")) {
            holder.txtSubject.setText("None");
        } else {

            holder.txtSubject.setText("" + entryItem.subject);
        }
        if (entryItem.fromUser.equals("None")) {
            holder.txtFromUser.setText("");
        } else if (entryItem.fromUser.equals("anyType{}")) {
            holder.txtFromUser.setText("From User : ");
        } else {
            holder.txtFromUser.setText("From User : " + entryItem.fromUser);
        }
        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.startDate)
                .equals("01-Jan-1970")) {
            holder.txtStartDate.setText("Start Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.startDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtStartDate.setText("Start Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.startDate));
        }

        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.endDate)
                .equals("01-Jan-1970")) {
            holder.txtEndDate.setText("Due Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.endDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtEndDate.setText("Due Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.endDate));
        }

    }
    else if(viewType == Type.Data3){

        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.category_timesheet_line_item, parent, false);

            Data3ViewHolder holder = new Data3ViewHolder ();
            holder.txtSubject = (TextView) view.findViewById(R.id.subject);
            holder.txtFromUser = (TextView) view.findViewById(R.id.user);
            holder.txtStartDate = (TextView) view
                    .findViewById(R.id.startDate);
            holder.txtEndDate = (TextView) view.findViewById(R.id.endDate);

            view.setTag(holder);
        }

        Data3ViewHolder holder = (Data3ViewHolder ) view.getTag();

        EntryItem entryItem = (EntryItem) getChild(groupPosition,
                childPosition);

        if (entryItem.subject.equals("None")) {
            holder.txtSubject.setText("None");
        } else {

            holder.txtSubject.setText("" + entryItem.subject);
        }
        if (entryItem.fromUser.equals("None")) {
            holder.txtFromUser.setText("");
        } else if (entryItem.fromUser.equals("anyType{}")) {
            holder.txtFromUser.setText("From User : ");
        } else {
            holder.txtFromUser.setText("From User : " + entryItem.fromUser);
        }
        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.startDate)
                .equals("01-Jan-1970")) {
            holder.txtStartDate.setText("Start Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.startDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtStartDate.setText("Start Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.startDate));
        }

        if (new SimpleDateFormat("dd-MMM-yyyy").format(entryItem.endDate)
                .equals("01-Jan-1970")) {
            holder.txtEndDate.setText("Due Date : None");
        } else if (new SimpleDateFormat("dd-MMM-yyyy").format(
                entryItem.endDate).equals("03-Mar-3800")) {
            holder.txtStartDate.setText("");
        } else {
            holder.txtEndDate.setText("Due Date : "
                    + new SimpleDateFormat("dd-MMM-yyyy")
                            .format(entryItem.endDate));
        }

    }
    return view;
}

@Override
public int getChildrenCount(int groupPosition) {
    return groups.get(groupPosition).entryItems.size();
}

@Override
public Object getGroup(int groupPosition) {
    return groups.get(groupPosition);
}

@Override
public int getGroupCount() {
    return groups.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {

    Type viewType = groups.get(groupPosition).type;
    View view = convertView;

    if (viewType == Type.Data1) {
        view = null;
        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.expandable_list_group_absenceview, parent,
                    false);

            Data1ViewHolder holder = new Data1ViewHolder ();
            holder.textabsence = (TextView) view
                    .findViewById(R.id.AbsencegroupHeader);
            holder.imageAbsence = (ImageView) view
                    .findViewById(R.id.AbsenceexpandableIcon);
            view.setTag(holder);
        }

        Data1ViewHolder holder = (Data1ViewHolder ) view.getTag();

        holder.textabsence.setText("Human Resource Absence" + " " + "("
                + groups.get(groupPosition).entryItems.size() + ")");

        if (groups.get(groupPosition).entryItems.size() == 0) {
            holder.imageAbsence.setVisibility(View.INVISIBLE);
        } else {
            int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float
                    : android.R.drawable.arrow_down_float;
            holder.imageAbsence.setImageResource(imageResourceId);

            holder.imageAbsence.setVisibility(View.VISIBLE);
        }
    }else if(viewType == Type.Data2) {
        view = null;
        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.expandable_list_group_ticketview, parent,
                    false);

            Data2ViewHolder holder = new Data2ViewHolder ();
            holder.textticket = (TextView) view
                    .findViewById(R.id.TicketgroupHeader);
            holder.imageTicket= (ImageView) view
                    .findViewById(R.id.TicketexpandableIcon);
            view.setTag(holder);
        }

        Data2ViewHolder holder = (Data2ViewHolder) view.getTag();

        holder.textticket.setText("Ticket Approvals" + " " + "("
                + groups.get(groupPosition).entryItems.size() + ")");

        if (groups.get(groupPosition).entryItems.size() == 0) {
            holder.imageTicket.setVisibility(View.INVISIBLE);
        } else {
            int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float
                    : android.R.drawable.arrow_down_float;
            holder.imageTicket.setImageResource(imageResourceId);

            holder.imageTicket.setVisibility(View.VISIBLE);
        }
    }
    else if(viewType == Type.Data3) {
        view = null;
        if (view == null) {
            view = LayoutInflater.from(context).inflate(
                    R.layout.expandable_list_group_timesheetview, parent,
                    false);

            Data3ViewHolder holder = new Data3ViewHolder ();
            holder.texttimesheet = (TextView) view
                    .findViewById(R.id.TimesheetgroupHeader);
            holder.imageTimesheet= (ImageView) view
                    .findViewById(R.id.TimesheetexpandableIcon);
            view.setTag(holder);
        }

        Data3ViewHolder holder = (Data3ViewHolder ) view.getTag();

        holder.texttimesheet.setText("TimeSheet Approvals" + " " + "("
                + groups.get(groupPosition).entryItems.size() + ")");

        if (groups.get(groupPosition).entryItems.size() == 0) {
            holder.imageTimesheet.setVisibility(View.INVISIBLE);
        } else {
            int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float
                    : android.R.drawable.arrow_down_float;
            holder.imageTimesheet.setImageResource(imageResourceId);

            holder.imageTimesheet.setVisibility(View.VISIBLE);
        }
    }
    return view;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

public void setupTrips(ArrayList<EntryItem> aryAbsence,ArrayList<EntryItem> aryTicket, ArrayList<EntryItem> aryTimeSheet) {
    groups.clear();

    if (aryAbsence != null) {
        Group g1 = new Group();
        g1.type = Type.Absence;
        g1.entryItems.clear();
        g1.entryItems = new ArrayList<EntryItem>(aryAbsence);

        groups.add(g1);
    }
    if (aryTicket != null) {
        Group g2 = new Group();
        g2.type = Type.Ticket;
        g2.entryItems.clear();
        g2.entryItems = new ArrayList<EntryItem>(aryTicket);

        groups.add(g2);
    }
    if (aryTimeSheet != null) {
        Group g3 = new Group();
        g3.type = Type.TimeSheet;
        g3.entryItems.clear();
        g3.entryItems = new ArrayList<EntryItem>(aryTimeSheet);

        groups.add(g3);
    }


    notifyDataSetChanged();
}

/*
 * Holder for the Past view type
 */

public static class Data1ViewHolder {
    public ImageView imageAbsence;
    public TextView textabsence;
    public TextView txtEndDate;
    public TextView txtStartDate;
    public TextView txtFromUser;
    public TextView txtSubject;

}

public static class Data2ViewHolder {
    public ImageView imageTicket;
    public TextView textticket;
    public TextView txtEndDate;
    public TextView txtStartDate;
    public TextView txtFromUser;
    public TextView txtSubject;

}
public static class Data3ViewHolder {
    public ImageView imageTimesheet;
    public TextView texttimesheet;
    public TextView txtEndDate;
    public TextView txtStartDate;
    public TextView txtFromUser;
    public TextView txtSubject;

}

/*
 * Wrapper for each group that contains the list elements and the type of
 * travel.
 */
public static class Group {
    public enum Type {
        Data_1,Data_2,Data_3;
    };

    public Type type;
    ArrayList<EntryItem> entryItems = new ArrayList<EntryItem>();
}

}

    这里的 EntryItem 是我使用 getter setter 方法的 Bean 类。而其他你必须为 Holder 制作一些 xml 文件。如果有任何查询你可以在这里问我有大量数据所以代码可能有点复杂但你可以在全球范围内使用它。

    【讨论】：

    • 您的 getChildView 如何为您工作？孩子的位置对我来说是不一致的。因此，如果我在子视图中跟踪并给它一个 ID，我可以看到有时我会为具有相同 ID 的视图获得不同的子位置。它确实会影响我的子视图中的数据。
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