需求：现有这样一套原始数据{“A”,"B","C","D","B","A","B","C","A","B","D","D"}.
要求将此数据组织成为双列表形式显示，即将元素相同的数据分为一组，即{["A","A","A"],["B","B","B","B"],["C","C"],["D","D","D"]}并将分组后的数据显示在ListView界面上。（外部ListView显示每一组，内部ListView显示每一组中的组成员）
以下是需求效果展示图：
第一步：组织数据源（这一步也是我认为的最重要的一部，剩下的都是数据显示的问题，相信大家都会的，呵呵）
1.过滤数据（筛选出不重复数据）
2.将重复数据分别放入不同的集合中（小集合）
3.将重复数据集合放到大集合中（用于存放小集合）
4.代码展示：
import java.util.ArrayList;import java.util.HashSet;import java.util.List;import java.util.Set;/** * 组织双列表的数据源 * @author yw-tony * */public class TwoListViewDataTools { private TwoListViewDataTools(){} private static TwoListViewDataTools instance; public static TwoListViewDataTools getInstance(){ synchronized (TwoListViewDataTools.class) { if(instance == null){ instance = new TwoListViewDataTools(); } } return instance; } /** * 根据分组标记找出每一种元素在集合中的个数，并组织成为一个个的集合，然后存入共同的大集合中 * @param data原始数据 * @return */ public List > listToGroup(List data){ //最终集合的展现形式 List > largeGroup = new ArrayList >(); //筛选后的集合，此集合中存放的是原始集合中的不重复元素 List diff = getListDifferentElement(data); for(int i=0;i littleGroup = new ArrayList (); for(int j= 0;j getListDifferentElement(List data){ //使用set集合可以过滤掉集合中的重复元素 Set sets = new HashSet (); List diff = new ArrayList (); for(int i=0;i
第二部：给列表填充数据（仅作代码展示，主要功能都加上了注释）
import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.MarginLayoutParams;import android.widget.BaseAdapter;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.TextView;import com.yw.myapiupdate.R;/** * 显示数据的主Activity类 * @author yw-tony * */public class ListViewTwoActivity extends Activity{ //分组后的集合 private List > group = new ArrayList >(); //原始数据集合 private List datas = new ArrayList (); private ListView lv_main; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.lv_two_main); /*初始化数据源*/ TwoListData.getInstance().addData(datas); //给集合列表赋值 group = TwoListViewDataTools.getInstance().listToGroup(datas); /*填充数据源*/ lv_main = (ListView)findViewById(R.id.lv_two_main_lv); MainBaseAdapter adapter = new MainBaseAdapter(this); adapter.setList(group); lv_main.setAdapter(adapter); //动态的计算列表的高度 setListViewHeightBasedOnChildren(lv_main); } /** * 外层baseadapter * @author yw-tony * */ class MainBaseAdapter extends BaseAdapter{ private Context context; private LayoutInflater inflater; private List > baseGroup = new ArrayList >(); public MainBaseAdapter(Context context){ this.context = context; this.inflater = LayoutInflater.from(context); } public void setList(List > baseGroup){ this.baseGroup = baseGroup; } @Override public int getCount() { return baseGroup.size(); } @Override public Object getItem(int arg0) { return baseGroup.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int arg0, View view, ViewGroup arg2) { if(view == null){ view = inflater.inflate(R.layout.lv_two_main_item, null); } ListView lv_item = (ListView)view.findViewById(R.id.lv_two_main_item); List items = baseGroup.get(arg0); //设置子listview的数据源，并显示出来 ItemBaseAdapter itemAdapter = new ItemBaseAdapter(ListViewTwoActivity.this); itemAdapter.setList(items); lv_item.setAdapter(itemAdapter); //设置内层数据列表的高度 setListViewHeightBasedOnChildren(lv_item); return view; } } /** * 子（内层）listview的数据源 * @author yw-tony * */ class ItemBaseAdapter extends BaseAdapter{ private Context context; private LayoutInflater inflater; private List items = new ArrayList (); public ItemBaseAdapter(Context context){ this.context = context; this.inflater = LayoutInflater.from(context); } public void setList(List items){ this.items = items; } @Override public int getCount() { return items.size(); } @Override public Object getItem(int position) { return items.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if(convertView == null){ convertView = inflater.inflate(R.layout.lv_two_item_item, null); } TextView tv = (TextView)convertView.findViewById(R.id.lv_two_item_item_tv); tv.setText(items.get(position)); return convertView; } } /**动态改变listView的高度*/ public void setListViewHeightBasedOnChildren(ListView listView) { ListAdapter listAdapter = listView.getAdapter(); if (listAdapter == null) { return; } int totalHeight = 0; for (int i = 0; i < listAdapter.getCount(); i++) { View listItem = listAdapter.getView(i, null, listView); listItem.measure(0, 0); totalHeight += listItem.getMeasuredHeight();// totalHeight += 80; } ViewGroup.LayoutParams params = listView.getLayoutParams();// params.height = 80 * (listAdapter.getCount() - 1);// params.height = 80 * (listAdapter.getCount()); params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1)); ((MarginLayoutParams) params).setMargins(0, 0, 0, 0); listView.setLayoutParams(params); }}
下面提出数据源（元数据）
import java.util.List;/** * 模拟从网络上获取到的数据源 * @author yw-tony * */public class TwoListData { private TwoListData(){} private static TwoListData instance; public static TwoListData getInstance(){ synchronized (TwoListData.class) { if(instance == null){ instance = new TwoListData(); } } return instance; } /** * 添加模拟数据 */ public void addData(List data){ data.add("A"); data.add("B"); data.add("C"); data.add("B"); data.add("A"); data.add("C"); data.add("A"); data.add("B"); data.add("A"); } } 以下给出配置文件信息
1.主文件：
2.主文件的item
3.item的item
运行后的展示效果图：
