我是android的新手，我想用动作事件的孩子创建一个expandablelistview。
我已按照此链接上的步骤完成了我的目标。
http://www.learn-android-easily.com/2013/07/android-expandablelistview-example.html
该项目对我来说很好。
但是我想对它做一些改变。
换句话说，我想为孩子的父母（不仅是父母和孩子）做父母
祖父。
例如。
如果水果是苹果，芒果，香蕉和橙子的父母，我想将水果本身包含在称为食物的父母中。
为此，我将MyExpandableAdapter类代码更改为： -
public class MyExpandableAdapter extends BaseExpandableListAdapter
{
private Activity activity;
private ArrayList<Object> childtems,parentofparents;
private LayoutInflater inflater;
private ArrayList<String> parentItems, child,pair;
// constructor
public MyExpandableAdapter(ArrayList<String> parents, ArrayList<Object> childern ,ArrayList<Object> parent)
{
this.parentofparents =parent;
this.parentItems = parents;
this.childtems = childern;
}
public void setInflater(LayoutInflater inflater, Activity activity)
{
this.inflater = inflater;
this.activity = activity;
}
// method getChildView is called automatically for each child view.
// Implement this method as per your requirement
@Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
{
child = (ArrayList<String>) childtems.get(groupPosition);
pair = (ArrayList<String>) parentofparents.get(groupPosition);
TextView textView = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.child_view, null);
}
// get the textView reference and set the value
textView = (TextView) convertView.findViewById(R.id.textViewChild);
textView.setText(child.get(childPosition));
// set the ClickListener to handle the click event on child item
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(activity, child.get(childPosition),
Toast.LENGTH_SHORT).show();
}
});
return convertView;
}
// method getGroupView is called automatically for each parent item
// Implement this method as per your requirement
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
{
if (convertView == null) {
convertView = inflater.inflate(R.layout.parent_view, null);
}
((CheckedTextView) convertView).setText(pair.get(groupPosition));
((CheckedTextView) convertView).setChecked(isExpanded);
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition)
{
return null;
}
@Override
public long getChildId(int groupPosition, int childPosition)
{
return 0;
}
@Override
public int getChildrenCount(int groupPosition)
{
return ((ArrayList<String>) childtems.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition)
{
return null;
}
@Override
public int getGroupCount()
{
return parentItems.size();
}
@Override
public void onGroupCollapsed(int groupPosition)
{
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition)
{
super.onGroupExpanded(groupPosition);
}
@Override
public long getGroupId(int groupPosition)
{
return 0;
}
@Override
public boolean hasStableIds()
{
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
return false;
}
}
我将ExpandableListMainActivity类更改为以下代码： -
public class ExpandableListMainActivity extends ExpandableListActivity
{
// Create ArrayList to hold parent Items and Child Items
private ArrayList<String> parentItems = new ArrayList<String>();
private ArrayList<Object> childItems = new ArrayList<Object>();
private ArrayList<Object> ParentOfparent = new ArrayList<Object>();
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Create Expandable List and set it's properties
ExpandableListView expandableList = getExpandableListView();
expandableList.setDividerHeight(2);
expandableList.setGroupIndicator(null);
expandableList.setClickable(true);
// Set the Items of Parent
setGroupParents();
// Set The Child Data
setChildData();
// Create the Adapter
MyExpandableAdapter adapter = new MyExpandableAdapter(parentItems, childItems,ParentOfparent);
adapter.setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
// Set the Adapter to expandableList
expandableList.setAdapter(adapter);
expandableList.setOnChildClickListener(this);
}
// method to add parent Items
public void setGroupParents()
{
parentItems.add("Fruits");
parentItems.add("Flowers");
parentItems.add("Animals");
parentItems.add("Birds");
ParentOfparent .add(parentItems);
}
// method to set child data of each parent
public void setChildData()
{
// Add Child Items for Fruits
ArrayList<String> child = new ArrayList<String>();
child.add("Apple");
child.add("Mango");
child.add("Banana");
child.add("Orange");
childItems.add(child);
// Add Child Items for Flowers
child = new ArrayList<String>();
child.add("Rose");
child.add("Lotus");
child.add("Jasmine");
child.add("Lily");
childItems.add(child);
// Add Child Items for Animals
child = new ArrayList<String>();
child.add("Lion");
child.add("Tiger");
child.add("Horse");
child.add("Elephant");
childItems.add(child);
// Add Child Items for Birds
child = new ArrayList<String>();
child.add("Parrot");
child.add("Sparrow");
child.add("Peacock");
child.add("Pigeon");
childItems.add(child);
}
}
但是我在行上收到错误
MyExpandableAdapter adapter = new MyExpandableAdapter（parentItems，childItems，ParentOfparent）;
构造函数MyExpandableAdapter（ArrayList，ArrayList）未定义。
有人可以指导我。
答案 0 :(得分：0)
ParentOfParents应该以小写字母开头，否则java会认为它是一个类
这样：
private ArrayList<Object> ParentOfparent = new ArrayList<Object>();
应该是
private ArrayList<Object> parentOfParent = new ArrayList<Object>();