ExpandableListView的例子

1. 定义groupItem和chidrenItem的layout，略；

2. 实现继承BaseExpandableListAdapter的类，如下：

public class MyExpandableListViewAdapter extends BaseExpandableListAdapter{    private String[] mGroupTypes = new String[] { "好友", "陌生人", "黑名单" };    private String[][] mGroupMembers = new String[][] { { "好友一", "好友二", "好友三", "好友四", "好友五" }, { "陌生人一", "陌生人二", "陌生人三", "陌生人四", "陌生人五", "陌生人六" },            { "黑名单一", "黑名单二", "黑名单三", "黑名四" } };    private LayoutInflater mLayoutInflater;    private OnChildItemClickListener mOnChildItemClickListener;    public MyExpandableListViewAdapter(Context context)    {        mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    }    @Override    public int getGroupCount()    {        return mGroupTypes.length;    }    @Override    public Object getGroup(int groupPosition)    {        return mGroupTypes[groupPosition];    }    @Override    public long getGroupId(int groupPosition)    {        return groupPosition;    }    @Override    public int getChildrenCount(int groupPosition)    {        return mGroupMembers[groupPosition].length;    }    @Override    public Object getChild(int groupPosition, int childPosition)    {        return mGroupMembers[groupPosition][childPosition];    }    @Override    public long getChildId(int groupPosition, int childPosition)    {        return childPosition;    }    @Override    public boolean hasStableIds()    {        return true;    }    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)    {        GroupViewHolder groupViewHolder;        if (convertView == null)        {            groupViewHolder = new GroupViewHolder();            convertView = mLayoutInflater.inflate(R.layout.groupitem, null);            groupViewHolder.mGroupInfo = (TextView) convertView.findViewById(R.id.expandablelistview_groupitem_info);            groupViewHolder.mGroupIcon = (ImageView) convertView.findViewById(R.id.expandablelistview_groupitem_icon);            convertView.setTag(groupViewHolder);        }        else        {            groupViewHolder = (GroupViewHolder) convertView.getTag();        }        if (isExpanded)            groupViewHolder.mGroupIcon.setImageResource(R.drawable.ic_uparrows);        else            groupViewHolder.mGroupIcon.setImageResource(R.drawable.ic_downarrows);        groupViewHolder.mGroupInfo.setText(mGroupTypes[groupPosition]);        return convertView;    }    private final class GroupViewHolder    {        TextView mGroupInfo;        ImageView mGroupIcon;    }    @Override    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent)    {        ChildViewHolder viewHolder;        if (convertView == null)        {            viewHolder = new ChildViewHolder();            convertView = mLayoutInflater.inflate(R.layout.childitem, null);            viewHolder.mChildInfoItem = (RelativeLayout) convertView.findViewById(R.id.paylist_item);            viewHolder.mChildItemInfo = (TextView) convertView.findViewById(R.id.paylist_item_goldtv);            convertView.setTag(viewHolder);        }        else        {            viewHolder = (ChildViewHolder) convertView.getTag();        }        viewHolder.mChildItemInfo.setText(mGroupMembers[groupPosition][childPosition]);        viewHolder.mChildInfoItem.setOnClickListener(new OnClickListener()        {            @Override            public void onClick(View view)            {                mOnChildItemClickListener.onChildItemClicked(groupPosition, childPosition);            }        });        return convertView;    }    private final class ChildViewHolder    {        RelativeLayout mChildInfoItem;        TextView mChildItemInfo;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition)    {        return true;    }    public interface OnChildItemClickListener    {        public void onChildItemClicked(int groupPosition, int childPosition);    }    public void setOnChildItemClickListener(OnChildItemClickListener onChildItemClickListener)    {        mOnChildItemClickListener = onChildItemClickListener;    }}

3. Activity中使用该适配器：

public class MainActivity extends Activity implements OnGroupExpandListener, OnChildItemClickListener{    private ExpandableListView mExpandableListView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                mExpandableListView = (ExpandableListView) findViewById(R.id.activity_main_expandablelistview);          mExpandableListView.setDivider(null);          mExpandableListView.setOnGroupExpandListener((OnGroupExpandListener) this);            MyExpandableListViewAdapter adapter = new MyExpandableListViewAdapter(this);          mExpandableListView.setAdapter(adapter);          adapter.setOnChildItemClickListener(this);     }    @Override      public void onGroupExpand(int groupPosition)      {          for (int i = 0, count = mExpandableListView.getExpandableListAdapter().getGroupCount(); i < count; i++)          {              if (groupPosition != i)              {                  // 关闭其他分组                  mExpandableListView.collapseGroup(i);              }          }      }        @Override      public void onChildItemClicked(int groupPosition, int childPosition)      {          Toast.makeText(this, "点击了" + groupPosition + "下的" + childPosition, Toast.LENGTH_SHORT).show();      }}