android – 在维护N级或多级可扩展列表视图的崩溃/展开状态后,一些子组不显示

我做了很多工作来创建** N级的可扩展列表视图.我能够做到任何级别,但我的要求是保持打开组的状态,即使滚动.我尝试了多种方式,但仍然没有成功.

此展开式列表视图满足除此问题之外的所有公司要求.

*这是我尝试的一种方式.我能够保存对象内的状态,但是很少的子组没有被显示出来. *

我尝试使用onMeasure(width,height)方法来维护动态生成列表时的高度,但仍然无法获得完美的一个.

另外我也经历了一些文章.

附加我的工作应用程序的屏幕截图..

这是我的代码

public class ParentLevelAdapter extends Baseexpandablelistadapter {

        private Context context;
        private View convertView;
        Account account;
        private ArrayList<Model_Departments> list_departments;

        public ParentLevelAdapter (Context context,ArrayList<Model_Departments> list_departments,Account account) {
            this.context = context;
            this.list_departments = list_departments;
            this.account = account;
        }

        public void updateList(Context context,Account account) {
            notifyDataSetChanged();
        }

        @Override
        public Object getChild(int arg0,int arg1) {
            return this.getChild(arg0,arg1);
        }

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

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

        {
            final SecondLevelExpandableListView subGroupListView;
            SecondListView employeeLisView = null;

            if (convertView == null) {
                if (list_departments.get(groupPosition).hasSubGroups()) {
                    subGroupListView = new SecondLevelExpandableListView(
                            context);

                    subGroupListView.setGroupIndicator(null);
                    adap = new ParentLevelAdapter (context,list_departments.get(groupPosition).subgroups,account);
                    subGroupListView.setAdapter(adap);
                    return subGroupListView;
                } else {
                    employeeLisView = new SecondListView(context);
                    employeeLisView.setAdapter(new EmployeeAdapter(context,list_departments.get

                            (groupPosition).employee,account));
                    return employeeLisView;
                }

            } else {
                if (list_departments.get(groupPosition).hasSubGroups()) {
                    if (convertView instanceof SecondLevelExpandableListView) {

                        subGroupListView = (SecondLevelExpandableListView) convertView;
                        subGroupListView.onMeasure(10000,999999);

                        subGroupListView.setGroupIndicator(null);
                        adap = new ParentLevelAdapter (context,account);
                        subGroupListView.setAdapter(adap);
                        return subGroupListView;
                    } else {
                        subGroupListView = new SecondLevelExpandableListView(
                                context);
                        subGroupListView.setGroupIndicator(null);
                        adap = new ParentLevelAdapter (context,account);
                        subGroupListView.setAdapter(adap);
                        return subGroupListView;
                    }
                } else {
                    if (convertView instanceof SecondListView) {
                        employeeLisView = (SecondListView) convertView;
                        employeeLisView.setAdapter(new EmployeeAdapter(context,list_departments.get(groupPosition).employee,account));
                        return employeeLisView;
                    } else {
                        employeeLisView = new SecondListView(context);
                        employeeLisView.setAdapter(new EmployeeAdapter(context,account));
                        return employeeLisView;
                    }
                }
            }
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            // return list_departments.get(groupPosition).subgroups.size();
            return 1;

        }

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

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

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

        @Override
        public View getGroupView(int groupPosition,boolean isExpanded,View convertV,ViewGroup parent) {
            convertView = convertV;
            // Log.v("ParentAdapter GroupView ",list_departments.get(groupPosition).name);
            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(R.layout.layout_icon_node,null);
                TextView text = (TextView) convertView
                        .findViewById(R.id.node_value);
                // text.setText("SECOND LEVEL");
                text.setText(list_departments.get(groupPosition).name);
            } else {
                TextView text = (TextView) convertView
                        .findViewById(R.id.node_value);
                text.setText(list_departments.get(groupPosition).name);
            }

            if (list_departments.get(groupPosition).isExpanded()) {
                Log.i("Group Position=",groupPosition + " NAme="
                        + list_departments.get(groupPosition).name);
                ((SecondLevelExpandableListView) parent)
                        .expandGroup(groupPosition);
            }


            /* code to save state for Group expand and collapse for individual objects*/
            ((SecondLevelExpandableListView) parent)
                    .setonGroupExpandListener(new OnGroupExpandListener() {
                        @Override
                        public void onGroupExpand(int groupPosition) {
                            // Todo Auto-generated method stub
                            list_departments.get(groupPosition).setExpanded(
                                    true);
                            Log.i("Group","Expand groupposition="
                                    + groupPosition);
                            Log.i("Group","Expand"
                                            + list_departments
                                                    .get(groupPosition).name);
                        }
                    });

            ((SecondLevelExpandableListView) parent)
                    .setonGroupCollapseListener(new OnGroupCollapseListener() {
                        @Override
                        public void onGroupCollapse(int groupPosition) {
                            // Todo Auto-generated method stub
                            list_departments.get(groupPosition).setExpanded(
                                    false);
                            Log.i("Group","Collapse groupposition="
                                    + groupPosition);
                            Log.i("Group","Collapse"
                                            + list_departments
                                                    .get(groupPosition).name);
                        }
                    });

            return convertView;
        }

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

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

我的Pojo_Object：

public class Model_Departments implements Comparable<Model_Departments>{

    public String name;
    protected long parent_id;
    private boolean isexpanded;
    public boolean isExpanded() {
        return isexpanded;
    }


    public void setExpanded(boolean isexpanded) {
        this.isexpanded = isexpanded;
    }


    public ArrayList<Model_Departments> subgroups = new ArrayList<>();
    public ArrayList<Model_Employees> employee = new ArrayList<>();

    public Model_Departments(String department_name,long parent_id) {
        this.name = department_name;
        this.parent_id = parent_id;

    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public long getParent_id() {
        return parent_id;
    }

    public void setParent_id(long parent_id) {
        this.parent_id = parent_id;
    }

    public ArrayList<Model_Departments> getSubgroups() {
        return subgroups;
    }

    public void setSubgroups(ArrayList<Model_Departments> subgroups) {
        this.subgroups = subgroups;
    }

    public ArrayList<Model_Employees> getEmployee() {
        return employee;
    }

    public void setEmployee(ArrayList<Model_Employees> employee) {
        this.employee = employee;
    }

    public boolean hasEmployees() {
        if (employee != null && employee.size() > 0)
            return true;
        else
            return false;
    }

    public boolean hasSubGroups() {
        if (subgroups != null && subgroups.size() > 0)
            return true;
        else
            return false;
    }

    @Override
    public int compareto(Model_Departments another) {

        if(this.hasSubGroups())
        {
            Collections.sort(this.subgroups);
        }
        return this.getName().compareto(another.getName());
    }

}

Model_Employee.java

public class Model_Employees implements Comparable<Model_Employees>{
    public String name;
    public Model_Employees(String name,String location) {
        super();
        this.name = name;
    }
    public Model_Employees() {
        // Todo Auto-generated constructor stub
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }


    @Override
    public int compareto(Model_Employees another) {
        return this.getName().compareto(another.getName());
    }

}

提前致谢.

解决方法

我有与N级Expandable ListView相同的问题,我使用一个只显示一个展开项的技巧.但是,尽管它看起来不是最好的解决方案,但希望它有帮助！

// display only one expand item
            mExpandableListView.setonGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
                int prevIoUsGroup = -1;
                @Override
                public void onGroupExpand(int groupPosition) {
                    if (groupPosition != prevIoUsGroup)
                        mExpandableListView.collapseGroup(prevIoUsGroup);
                    prevIoUsGroup = groupPosition;
                }
            });

并在secondLevelExpListView上相同

更新：

另一种方法可以尝试如下(与上面的setonGroupExpandListener一起)：

public class CustomExpListView extends ExpandableListView
{
    public CustomExpListView(Context context)
    {
        super(context);
    }
    protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec)
    {
        widthMeasureSpec = MeasureSpec.makeMeasureSpec(960,MeasureSpec.AT_MOST);
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(2000,MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec,heightMeasureSpec);
    }
}

然后在您的ParentLevelAdapter中调用这个：

@Override
    public View getChildView(int groupPosition,ViewGroup parent) {
        final CustomExpListView secondLevelExpListView = new CustomExpListView(this.mContext);
        String parentNode = (String) getGroup(groupPosition);
        secondLevelExpListView.setAdapter(new SecondLevelAdapter(this.mContext,mListData_SecondLevel_Map.get(parentNode),mListData_ThirdLevel_Map));
        secondLevelExpListView.setGroupIndicator(null);
        secondLevelExpListView.setonGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            int prevIoUsGroup = -1;
            @Override
            public void onGroupExpand(int groupPosition) {
                if (groupPosition != prevIoUsGroup)
                    secondLevelExpListView.collapseGroup(prevIoUsGroup);
                prevIoUsGroup = groupPosition;
            }
        });
        return secondLevelExpListView;
    }

如果你不想使用setonGroupExpandListener,那么你应该增加像这样的heightMeasureSpec heightMeasureSpec = MeasureSpec.makeMeasureSpec(20000,MeasureSpec.AT_MOST);

请注意,我只测试了3级可扩展列表视图,您可以在以下问题的答案中阅读更多：

How to add Three Level ListView in ExpandableListView in android

我已将我的全部项目发布到GitHub