lab2 - adapter

package com.example.lab2;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.TextView;

import java.util.List;
import java.util.Map;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    Context context;
    List<String> parents;
    Map<String, List<String>> children;

    public MyExpandableListAdapter(Context context, List<String> parents, Map<String, List<String>> children) {
        this.context = context;
        this.parents = parents;
        this.children = children;
    }


    @Override
    public int getGroupCount() {
        return parents.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return children.get(parents.get(groupPosition)).size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return parents.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return children.get(parents.get(groupPosition)).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 false;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        String title = (String) getGroup(groupPosition);

        if(convertView == null){
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.parent_list, null);
        }

        TextView txtParent = (TextView) convertView.findViewById(R.id.textParent);
        txtParent.setText(title);

        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

        String child = (String) getChild(groupPosition, childPosition);

        if(convertView == null){
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.child_list, null);
        }

        TextView txtChild = (TextView) convertView.findViewById(R.id.textChild);
        txtChild.setText(child);

        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}