Problème avec l'Expansion de la Multi-Niveau ExpandableListView

J'ai fini à l'aide d'un multi niveau ExpandableListView carte à partir d'un autre poste de stackoverflow. Malheureusement, je ne peux pas trouver le lien plus donc je vais juste poster mon code ici.

Haut Niveau de la ExpandableListView adaptateur.

RootAdapter.java:

public class RootAdapter extends BaseExpandableListAdapter {
private Object root;
private final LayoutInflater inflater;
public class Entry {
public final CustExpListview cls;
public final SecondLevelAdapter sadpt;
public Entry(CustExpListview cls, SecondLevelAdapter sadpt) {
this.cls = cls;
this.sadpt = sadpt;
}
}
public Entry[] lsfirst;
//you can change the constructor depending on which listeners you wan't to use.
public RootAdapter(Context context, Object root, ExpandableListView.OnGroupClickListener grpLst,
ExpandableListView.OnChildClickListener childLst, ExpandableListView.OnGroupExpandListener grpExpLst) {
this.root = root;
this.inflater = LayoutInflater.from(context);
lsfirst = new Entry[root.children.size()];
for (int i = 0; i < root.children.size(); i++) {
final CustExpListview celv = new CustExpListview(context);
SecondLevelAdapter adp = new SecondLevelAdapter(root.children.get(i));
celv.setAdapter(adp);
celv.setGroupIndicator(null);
celv.setOnChildClickListener(childLst);
celv.setOnGroupClickListener(grpLst);
celv.setOnGroupExpandListener(grpExpLst);
lsfirst[i] = new Entry(celv, adp);
}
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return 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) {
//second level list
return lsfirst[groupPosition].cls;
}
@Override
public int getChildrenCount(int groupPosition) {
return 1;
}
@Override
public Object getGroup(int groupPosition) {
return root.children.get(groupPosition);
}
@Override
public int getGroupCount() {
return root.children.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
//first level
View layout = convertView;
GroupViewHolder holder;
final Object item = (Object) getGroup(groupPosition);
if (layout == null) {
layout = inflater.inflate(R.layout.item_root, parent, false);
holder = new GroupViewHolder();
holder.title = (TextView) layout.findViewById(R.id.itemRootTitle);
layout.setTag(holder);
} else {
holder = (GroupViewHolder) layout.getTag();
}
holder.title.setText(item.title.trim());
return layout;
}
private static class GroupViewHolder {
TextView title;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}

Personnalisé ExpandableListView avec la solution d'éléments parfois ne pas être affichés. Il y a aussi une solution de contournement d'un bogue connu pour IllegalArgumentException être appelée lors de la destruction de la vue (en appuyant sur le bouton retour pour l'essentiel).

CustExpListview.java:

public class CustExpListview extends ExpandableListView {
public CustExpListview(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//the value (2000) should not be fixed and be calculated
//as follows: cell_height x root_items_count x root_items_children_count
heightMeasureSpec = MeasureSpec.makeMeasureSpec(2000, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDetachedFromWindow() {
try {
super.onDetachedFromWindow();
} catch (IllegalArgumentException e) {
//TODO: Workaround for http://code.google.com/p/android/issues/detail?id=22751
}
}
}

Enfin, le code pour le dernier niveau de l'adaptateur.

public class SecondLevelAdapter extends BaseExpandableListAdapter {
public Object child;
public SecondLevelAdapter(Object child) {
this.child = child;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return child.children.get(groupPosition).children.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
//third level
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
View layout = convertView;
final Object item = (Object) getChild(groupPosition, childPosition);
ChildViewHolder holder;
if (layout == null) {
layout = inflater.inflate(R.layout.item_child, parent, false);
holder = new ChildViewHolder();
holder.title = (TextView) layout.findViewById(R.id.itemChildTitle);
layout.setTag(holder);
} else {
holder = (ChildViewHolder) layout.getTag();
}
holder.title.setText(item.title.trim());
return layout;
}
@Override
public int getChildrenCount(int groupPosition) {
return child.children.get(groupPosition).children.size();
}
@Override
public Object getGroup(int groupPosition) {
return child.children.get(groupPosition);
}
@Override
public int getGroupCount() {
return child.children.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
//Second level
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
View layout = convertView;
ViewHolder holder;
final Object item = (Object) getGroup(groupPosition);
if (layout == null) {
layout = inflater.inflate(R.layout.item_parent, parent, false);
holder = new ViewHolder();
holder.title = (TextView) layout.findViewById(R.id.itemParentTitle);
layout.setTag(holder);
} else {
holder = (ViewHolder) layout.getTag();
}
holder.title.setText(item.title.trim());
return layout;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
super.registerDataSetObserver(observer);
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
Log.d("SecondLevelAdapter", "Unregistering observer");
if (observer != null) {
super.unregisterDataSetObserver(observer);
}
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
private static class ViewHolder {
TextView title;
}
private static class ChildViewHolder {
TextView title;
}
}

J'espère que cela aide!!!

Mise à jour

Ceci est un exemple de la façon dont je l'appelle le dessus de l'adaptateur.

MainActivity:

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final List<Object> objects = yourItems;
if (!objects.isEmpty()) {
final ExpandableListView elv = (ExpandableListView) findViewById(R.id.yourExpandableListView);
/* Item click listeners below */
//First level items in the ExpandableListView
elv.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView eListView, View view, int groupPosition,
long id) {
//TODO: whatever you need
return false /* or true depending on what you need */;
}
});
//Second level items in the ExpandableListView
ExpandableListView.OnGroupClickListener grpLst = new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView eListView, View view, int groupPosition,
long id) {
//TODO: whatever you need
return false /* or true depending on what you need */;
}
};
//Third (and last) level items in the ExpandableListView
ExpandableListView.OnChildClickListener childLst = new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView eListView, View view, int groupPosition,
int childPosition, long id) {
//TODO: whatever you need
return false /* or true depending on what you need */;
}
};
ExpandableListView.OnGroupExpandListener grpExpLst = new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
/* this one is not required of course, you can delete it from the RootAdapter Constructor
* it is just an example as to how to implement Listeners on the second level items */
}
};
final RootAdapter adapter = new RootAdapter(this, objects, grpLst, childLst, grpExpLst);
elv.setAdapter(adapter);
}
}

C'est la façon dont ma classe de l'Objet.

Object.java:

public class Object {
public String title; //use getters and setters instead
public List<Object> children; //same as above
public Object() {
children = new ArrayList<Object>();
}
}

OriginalL'auteur Tomap