Statistical query group and sort

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/* Copyright 2018 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgisruntime.sample.statisticalquerygroupandsort;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

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

/**
 * Expandable list view which displays grouped results from a LinkedHashMap.
 */
class ExpandableListViewAdapter extends BaseExpandableListAdapter {

  private final Context context;
  private final List<String> mGroupList;
  private final LinkedHashMap<String, List<String>> mStatList;

  public ExpandableListViewAdapter(Context context, LinkedHashMap<String, List<String>> statList) {
    this.context = context;
    mGroupList = new ArrayList<>(statList.keySet());
    mStatList = statList;
  }

  @Override
  public Object getChild(int groupListPosition, int statListPosition) {
    return mStatList.get(mGroupList.get(groupListPosition)).get(statListPosition);
  }

  @Override
  public long getChildId(int groupPosition, int statListPosition) {
    return statListPosition;
  }

  @Override
  public View getChildView(int groupListPosition, final int statListPosition, boolean isLastChild, View convertView,
      ViewGroup parent) {
    final String expandedListText = (String) getChild(groupListPosition, statListPosition);
    if (convertView == null) {
      LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView = layoutInflater.inflate(android.R.layout.simple_expandable_list_item_1, null);
    }
    TextView expandedListTextView = convertView.findViewById(android.R.id.text1);
    expandedListTextView.setText(expandedListText);
    return convertView;
  }

  @Override
  public int getChildrenCount(int listPosition) {
    return mStatList.get(mGroupList.get(listPosition)).size();
  }

  @Override
  public Object getGroup(int listPosition) {
    return mGroupList.get(listPosition);
  }

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

  @Override
  public long getGroupId(int listPosition) {
    return listPosition;
  }

  @Override
  public View getGroupView(int listPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String listTitle = (String) getGroup(listPosition);
    if (convertView == null) {
      LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView = layoutInflater.inflate(android.R.layout.simple_expandable_list_item_1, null);
    }
    TextView listTitleTextView = convertView.findViewById(android.R.id.text1);
    listTitleTextView.setTypeface(null, Typeface.BOLD);
    listTitleTextView.setText(listTitle);
    return convertView;
  }

  @Override
  public boolean hasStableIds() {
    return false;
  }

  @Override
  public boolean isChildSelectable(int listPosition, int expandedListPosition) {
    return true;
  }
}