可扩展列表返回0作为childCount（）

Question

我有一个可扩展的列表，它在init函数中填充（1个父项，10个孩子）。当我的应用程序启动（扩展列表）时，我可以看到条目，但getChildCount() = 0。

我需要折叠并展开列表才能使用它。命令getCount()返回正确的值，但这对我没有帮助。

我想在开头标记一个条目（更改背景），但我不能，因为列表似乎是空的。

祝你好运

（Android 2.3.3）

修改

抱歉延误。我使用的可扩展列表视图的示例如下所示。

1. Init函数（名为onCreate（））

   private void init_List() {
   
   Log.i("Function", "Init_List()");
   mExpandableList = (ExpandableListView) findViewById(R.id.expandableList);
   
   ArrayList<ListParent> arrayParents = new ArrayList<ListParent>();
   ArrayList<String> arrayChildren = new ArrayList<String>();
   
   // here we set the parents and the children
   
   ListParent parent = new ListParent();
   parent.setTitle(this.getString(R.string.parent_title));
   
   arrayChildren = new ArrayList<String>();
   
   for (int i=0; i<10; i++){
       arrayChildren.add(i+1+". "+names[i]);
   
   }
   
   parent.setArrayChildren(arrayChildren);
   
   // In this array we add the Parent object. We will use the arrayParents
   // at the setAdapter
   arrayParents.add(parent);
   
   // Sets the adapter that provides data to the list.
   mExpandableList.setAdapter(new ListAdapter(this,
           arrayParents));
   
   mExpandableList.setOnChildClickListener(this);
   mExpandableList.setOnGroupClickListener(this);
   }
   

2. ListAdapter

   公共类ListAdapter扩展了BaseExpandableListAdapter {

   private LayoutInflater inflater;
   private ArrayList<ListParent> mParent;
   
   public ListAdapter(Context context, ArrayList<ListParent> parent){
       mParent = parent;
       inflater = LayoutInflater.from(context);
   }
   
   @Override
   //counts the number of group/parent items so the list knows how many times calls getGroupView() method
   public int getGroupCount() {
       return mParent.size();
   }
   
   @Override
   //counts the number of children items so the list knows how many times calls getChildView() method
   public int getChildrenCount(int i) {
       return mParent.get(i).getArrayChildren().size();
   }
   
   @Override
   //gets the title of each parent/group
   public Object getGroup(int i) {
       return mParent.get(i).getTitle();
   }
   
   @Override
   //gets the name of each item
   public Object getChild(int i, int i1) {
       return mParent.get(i).getArrayChildren().get(i1);
   }
   
   @Override
   public long getGroupId(int i) {
       return i;
   }
   
   @Override
   public long getChildId(int i, int i1) {
       return i1;
   }
   
   @Override
   public boolean hasStableIds() {
       return true;
   }
   
   @Override
   //in this method you must set the text to see the parent/group on the list
   public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
   
       ViewHolder holder = new ViewHolder();
       holder.groupPosition = i; //Group position
   
       if (view == null) {
           view = inflater.inflate(R.layout.list_item_parent, viewGroup,false);
       }
   
       TextView textView = (TextView) view.findViewById(R.id.list_item_text_view);
       //"i" is the position of the parent/group in the list
       textView.setText(getGroup(i).toString());
   
   
       view.setTag(holder);
   
       //return the entire view
       return view;
   }
   
   @Override
   //in this method you must set the text to see the children on the list
   public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
   
       ViewHolder holder = new ViewHolder();
       holder.childPosition = i1; //child position
       holder.groupPosition = i; // group position
   
       if (view == null) {
           view = inflater.inflate(R.layout.list_item_child, viewGroup,false);
       }
   
       TextView textView = (TextView) view.findViewById(R.id.list_item_text_child);
       //"i" is the position of the parent/group in the list and
       //"i1" is the position of the child
       textView.setText(mParent.get(i).getArrayChildren().get(i1));
   
       view.setTag(holder);
   
       //return the entire view
       return view;
   }
   
   @Override
   public boolean isChildSelectable(int i, int i1) {
       return true;
   }
   
   @Override
   public void registerDataSetObserver(DataSetObserver observer) {
       /* used to make the notifyDataSetChanged() method work */
       super.registerDataSetObserver(observer);
   }
   
   
   protected class ViewHolder {
           protected int childPosition;
           protected int groupPosition;
    protected Button button;
   

   }     }

3. 列出父母

   public class ListParent {

   private String mTitle;
   private ArrayList<String> mArrayChildren;
   
   public String getTitle() {
       return mTitle;
   }
   
   public void setTitle(String mTitle) {
       this.mTitle = mTitle;
   }
   
   public ArrayList<String> getArrayChildren() {
       return mArrayChildren;
   }
   
   public void setArrayChildren(ArrayList<String> mArrayChildren) {
       this.mArrayChildren = mArrayChildren;
   }
   

   }