Android Open Source - Weather My List Adapter

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.imlongluo.weather.location;
/*  www .  ja v  a  2 s.  com*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.graphics.Color;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

/**  
 * 
 * @author longluo 
 * ?????????????????<br />
 * ?????????????A,B????????????group1??
 * <code>
 * String[] groups={"group1", "group2", "group3"};
 * String[][] childs={{"A", "B"},{"C", "D"},{"E", "F"}};
 * provinceList= (ExpandableListView)findViewById(R.id.provinceList);
 * BaseExpandableListAdapter adapter=new MyListAdapter(this, groups, childs);
 * provinceList.setAdapter(adapter);
 * </code>
 * ??????????????????
 */
public class MyListAdapter extends BaseExpandableListAdapter implements Filterable {
  
  /**
   * ??????????????
   */
  private String[] groups;
  /**
   * ??????????????
   */
  private String[][] childs;
  
  /**
   * ??????????????
   */
  private String[] allGroups;
  
  /**
   * ??????????????
   */
  private String[][] allChilds;
  
  /**
   * ?????Context???????TextView??
   * @see #getGenericView
   */
  private Context context;
  
  /**
   * ?????????
   */
  private CityFilter filter;
  
  /**
   * ??????????????????
   */
  private ExpandableListView provinceList;
  
  /**
   * ???????????????????????????????????????????????
   * ???childs???groups??????
   * <br />
   * @param context ? <code>Context</code>?????????????????
   * @param groups ?<code>String</code>???????????????????
   * @param childs ?<code>String</code>????,?groups????????????????????
   */
  public MyListAdapter(Context context, ExpandableListView listView, String[] groups, String[][] childs) {
    this.context = context;
    this.groups = groups;
    this.childs = childs;
    allGroups = groups;
    allChilds = childs;
    this.provinceList = listView;
  }
  
  
  /**
   * ?????????????<code>groupPosition</code>?????????????<code>childPosition</code>
   * ???????????<br />
   * @param groupPostion?????????????
   * @param childPostion??????????????
   * @return ????????????
   */
  @Override
  public Object getChild(int groupPosition, int childPosition) {
    return childs[groupPosition][childPosition];
  }

  /**
   * ?????????????<code>groupPosition</code>?????????????<code>childPosition</code>
   * ?????????ID
   * @param groupPostion?????????????
   * @param childPostion??????????????
   * @return ????????????ID
   */
  @Override
  public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
  }
  
  /**
   * @return ????????<code>View<code>??
   */
  @Override
  public View getChildView(int groupPosition, int childPosition,
      boolean isLastChild, View convertView, ViewGroup parent) {
    TextView textView = null;
    //????convertView??????????????????????
    if(convertView==null) {
      //????TextView??
      textView = getGenericView();
      //????????
      textView.setText(getChild(groupPosition, childPosition).toString());
    } else {
      textView = (TextView)convertView;
      textView.setText(getChild(groupPosition, childPosition).toString());
    }
    
    return textView;
  }

  /**
   * ????????????????
   * @param groupPosition????????
   * @return ?????????
   */
  @Override
  public int getChildrenCount(int groupPosition) {
    return childs[groupPosition].length;
  }

  /**
   * ????????<code>groupPosition</code>???????????
   * @return ???????
   */
  @Override
  public Object getGroup(int groupPosition) {
    return groups[groupPosition];
  }

  /**
   * ???????
   * @return ????????
   */
  @Override
  public int getGroupCount() {
    return groups.length;
  }

  /**
   * ??????ID,??????
   * @param groupPosition?????????
   * @return ????ID??<code>0</code>??
   */
  @Override
  public long getGroupId(int groupPosition) {
    return groupPosition;
  }

  /**
   * @return ???????<code>View</code>????
   */
  @Override
  public View getGroupView(int groupPosition, boolean isExpanded,
      View convertView, ViewGroup parent) {
    TextView textView = null;
    if(convertView==null){
      textView = getGenericView();
      textView.setText(getGroup(groupPosition).toString());
    }else {
      textView = (TextView)convertView;
      textView.setText(getGroup(groupPosition).toString());
    }
    
    return textView;
  }

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

  /**
   * ?????????????????
   * @param groupPosition ????????
   * @param childPosition ????????
   * @return ???
   */
  @Override
  public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
  }
  
  /**
   * ????TextView????
   * @return ??TextView????
   */
   private TextView getGenericView() {
    AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT, 48);
    
    TextView textView = new TextView(context);
    
    textView.setLayoutParams(lp);
    textView.setTextSize(18);
    textView.setTextColor(Color.WHITE);
    textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
    textView.setPadding(32, 0, 0, 0);
    return textView;
  }

  /**
   * ????????????
   * @return Filter ???????
   */
  @Override
  public Filter getFilter() {
    if(filter == null) {
      filter = new CityFilter();
    }
    return filter;
  }
  
  private class CityFilter extends Filter {

    /**
     * ???????????????????????????????FilterResults
     * @param constraint ??????????
     * @return ???????????
     */
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
      FilterResults results = new FilterResults();
      
      //???????????????????,?????????????
      Map<Integer, ArrayList<Integer>> values = new HashMap<Integer, ArrayList<Integer>>();
      //??????????????????????
      if(constraint == null || constraint.length() == 0) {
        for(int i=0; i<allGroups.length; i++) {
          ArrayList<Integer> index = new ArrayList<Integer>();
          //???????????
          for(int j=0; j<allChilds[i].length; j++) {
            index.add(j);
          }
          values.put(i, index);
        }
      } else {
        String filterStr = constraint.toString();
        for(int i=0; i<allGroups.length; i++) {
          //???????????????????????
          if(allGroups[i].contains(filterStr)) {
            ArrayList<Integer> index = new ArrayList<Integer>();
            //???????????
            for(int j=0; j<allChilds[i].length; j++) {
              index.add(j);
            }
            values.put(i, index);
          } else {
            ArrayList<Integer> index = new ArrayList<Integer>();
            //?????????????????????????????????
            for(int j=0; j<allChilds[i].length; j++) {
              if(allChilds[i][j].contains(filterStr)) {
                index.add(j);
              }
            }
            //??????????????????????????
            if(index.size() > 0) {
              values.put(i, index);
            } else {
              index = null;
            }
          }
        }
      }
      
      results.values = values;
      results.count = values.size();
      
      return results;
    }

    /**
     * ??????????results??????????????
     * @param constraint ??????
     * @param results ???????
     */
    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint,
        FilterResults results) {
      //???????????????
      Map<Integer, ArrayList<Integer>> filterResult = (Map<Integer, ArrayList<Integer>>) results.values;
      int count = filterResult.size();
      //?????
      if( count > 0) {
        String[] newGroups = new String[count];
        String[][] newChilds = new String[count][];
        int index = 0;
        int length = 0;
        //????groups?childs
        for(int i=0; i<allGroups.length; i++) {
          if(filterResult.containsKey(i)) {
            newGroups[index] = allGroups[i];
            //???????????
            ArrayList<Integer> citys = filterResult.get(i);
            length = citys.size();
            newChilds[index] = new String[length];
            for(int j = 0; j< length; j++) {
              newChilds[index][j] = allChilds[i][citys.get(j)];
            }
            index = index + 1;
          }
        }
        //??groups?childs
        groups = newGroups;
        childs = newChilds;
        
        //????
        notifyDataSetChanged();
        
        //??????????
        count = getGroupCount();
        if(count < 34) {
          //???????
          for(int i=0; i<count; i++) {
            provinceList.expandGroup(i);
          }
        } else {
          //???????
          for(int i=0; i<count; i++) {
            provinceList.collapseGroup(i);
          }
        }
      } else {
        //???????????????????
        notifyDataSetInvalidated();
      }
    }
  }
}

Java Source Code List

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