维护解体后/扩展状态N级或多级expandablelistview子群不显示 [英] After maintaining collapse/expand state for N-level or Multilevel expandablelistview some subgroups are not displayed
本文介绍了维护解体后/扩展状态N级或多级expandablelistview子群不显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我做了很多创造** N级expandableListView。我能使其任何级别，但我的要求是，即使滚动后保持打开组的状态。我试着用多种方式，但仍然没有成功。
这可扩展的ListView是满足所有公司的要求比这个问题等。
This Expandable listview is meeting with all company requirement other than this issue.
*这是一种方式，我试过。我能保存状态的对象内，但一些子组没有得到显示。 *
我试着用onMeasure（宽，高）的方法来保持高度的时候动态生成的列表中，但仍然没能得到完美的一个。
I tried with onMeasure(width,height) method to maintain the height when dynamic generated list but still failed to get perfect one.
此外，我经历了许多文章是一样的。
Also i went through a number of articles for the same.
附我的工作的应用程序的截图。
Attached Screenshot of my working application..
下面是我的code。
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,
ArrayList<Model_Departments> list_departments, 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,
list_departments.get(groupPosition).subgroups,
account);
subGroupListView.setAdapter(adap);
return subGroupListView;
} else {
subGroupListView = new SecondLevelExpandableListView(
context);
subGroupListView.setGroupIndicator(null);
adap = new ParentLevelAdapter (context,
list_departments.get(groupPosition).subgroups,
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,
list_departments.get(groupPosition).employee,
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());
}
}
在此先感谢。
Thanks in advance.
推荐答案
我以前有N级可扩展的ListView有同样的问题，我用的显示只有一个扩展项目的把戏。虽然它看起来并不像你的最佳解决方案，但是，希望它能帮助！
I have the same issue before with N-level Expandable ListView, I use a trick that displays only one expand item. Although it does not look like the best solution for you, however, hope it helps!
// 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;
}
});
和 secondLevelExpListView
更新：
另一种方式，你可以尝试如下（与上面 setOnGroupExpandListener ）：
Another way you can try as the following (together with above setOnGroupExpandListener):
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);
}
}
然后在你的 ParentLevelAdapter 称之为：
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, 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 ，那么你就应该增加 heightMeasureSpec 这样的 heightMeasureSpec = MeasureSpec.makeMeasureSpec（20000，MeasureSpec.AT_MOST）;
If you don't want to use setOnGroupExpandListener, then you should increase heightMeasureSpec like this heightMeasureSpec = MeasureSpec.makeMeasureSpec(20000, MeasureSpec.AT_MOST);
请注意，我只用3级可扩展列表视图测试，你可以阅读更多的在我的答案在以下问题：
Please note that I have only tested with 3-level expandable list view, you can read more at my answer at the following question:
<一个href="http://stackoverflow.com/questions/32880281/how-to-add-three-level-listview-in-expandablelistview-in-android/">How加三级的ListView在ExpandableListView在安卓
我已经发布了我的全部项目，以 GitHub上
I have posted my full project to GitHub
这篇关于维护解体后/扩展状态N级或多级expandablelistview子群不显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
