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
