ExpandableListAdapter二级菜单适配器

package com.bawei.test313.adapter;import android.content.Context;import android.database.CursorJoiner;import android.database.DataSetObserver;import android.view.View;import android.view.ViewGroup;import android.widget.ExpandableListAdapter;import android.widget.TextView;import com.bawei.test313.R;import com.bawei.test313.bean.Info;import java.util.ArrayList;/** * Created by Administrator on 2017/3/13. */public class MyAdapter implements ExpandableListAdapter {   // private ArrayList<Info.Result> result;    private ArrayList<Info.Result> parent_list;    private ArrayList<Info.Result> child_list;    private Context context;    public MyAdapter(ArrayList<Info.Result> parent_list, ArrayList<Info.Result> child_list, Context context) {        this.parent_list = parent_list;        this.child_list = child_list;        this.context = context;    }    @Override    public void registerDataSetObserver(DataSetObserver observer) {    }    @Override    public void unregisterDataSetObserver(DataSetObserver observer) {    }    @Override    public int getGroupCount() {        return parent_list.size();    }    @Override    public int getChildrenCount(int groupPosition) {        ArrayList<Info.Result> list_this=new ArrayList<Info.Result>();        for(int i=0;i<child_list.size();i++){            if (child_list.get(i).parentid.equals(parent_list.get(groupPosition).cityid)){                list_this.add(child_list.get(i));            }        }        return list_this.size();    }    @Override    public Object getGroup(int groupPosition) {        return parent_list.get(groupPosition);    }    @Override    public Object getChild(int groupPosition, int childPosition) {        return child_list.get(childPosition);    }    @Override    public long getGroupId(int groupPosition) {        return groupPosition;    }    @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) {       convertView=View.inflate(context, R.layout.list_main,null);        TextView parent_text = (TextView) convertView.findViewById(R.id.parent_text);        parent_text.setText(parent_list.get(groupPosition).city);        return convertView;    }    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        convertView=View.inflate(context, R.layout.child_main,null);        TextView child_text = (TextView) convertView.findViewById(R.id.child_text);        //寻找到对应条目的子条目集合        ArrayList<Info.Result> list_this=new ArrayList<Info.Result>();        for (int i=0;i<child_list.size();i++){            if (child_list.get(i).parentid.equals(parent_list.get(groupPosition).cityid)){                list_this.add(child_list.get(i));            }        }        child_text.setText(list_this.get(childPosition).city);        return convertView;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;    }    @Override    public boolean areAllItemsEnabled() {        return true;    }    @Override    public boolean isEmpty() {        return false;    }    @Override    public void onGroupExpanded(int groupPosition) {    }    @Override    public void onGroupCollapsed(int groupPosition) {    }    @Override    public long getCombinedChildId(long groupId, long childId) {        return 0;    }    @Override    public long getCombinedGroupId(long groupId) {        return 0;    }}