我正在尝试以编程方式将子项添加到父项。那只是没有尝试，没有任何作用。
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。
答案 0 :(得分：1)
这是..
我的班级名称 SortCategoryExpand
我初始化 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);
}
现在它是 ExpandableListAdapter 类
public class ExpandableListAdapter扩展了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Bean类，我使用getter setter方法。而其他你必须为Holder制作一些xml文件。如果您在这里可以询问任何查询我有大量数据，因此代码可能不太复杂，但您可以将其用于全局。