模拟QQ分组

package com.lixu.fenzu;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.ListActivity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends ListActivity {
    private static final String TYPE = "type";
    private static final String DATE = "date";
    private static final int GROUP = -1;
    private static final int ITEM = -2;

    private ArrayList<HashMap<String, Object>> item = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ListView lv = this.getListView();
        ArrayAdapter adapter = new MyAdaper(this, 1);

        item = new ArrayList<HashMap<String, Object>>();
        

        String[] groups = { "家人", "朋友", "同学", "同事" };
        String[] date = { "张三", "李四", "王五", "狗儿" };
        for (String str:groups) {  
            HashMap<String, Object> group_map = new HashMap<String, Object>();

            group_map.put(TYPE, GROUP);
            group_map.put(DATE, str);
            item.add(group_map);
            for (String n : date) {

                HashMap<String, Object> date_map = new HashMap<String, Object>();

                date_map.put(TYPE, ITEM);
                date_map.put(DATE, n);
                item.add(date_map);

            }

        }
        lv.setAdapter(adapter);

    }

    public class MyAdaper extends ArrayAdapter {
        private LayoutInflater flater = null;

        public MyAdaper(Context context, int resource) {
            super(context, resource);
            flater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getCount() {
            return item.size();
        }

        @Override
        public int getItemViewType(int position) {
            HashMap<String, Object> map = item.get(position);
            return (Integer) map.get(TYPE);
        }

        @Override
        public int getViewTypeCount() {

            return 2;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            int type = getItemViewType(position);
            // 根据不同的view type加载不同的布局文件。
            switch (type) {
            case GROUP:

                convertView = flater.inflate(R.layout.activity_main, null);
                TextView tv1 = (TextView) convertView.findViewById(R.id.tv1);
                tv1.setText(item.get(position).get(DATE) + "");
                tv1.setBackgroundColor(Color.RED);
                tv1.setTextSize(20);

                break;
            case ITEM:
                convertView = flater.inflate(R.layout.activity_main, null);
                TextView tv2 = (TextView) convertView.findViewById(R.id.tv1);
                tv2.setText(item.get(position).get(DATE) + "");

                break;

            default:
                break;
            }

            return convertView;
        }

    }
}

 运行效果：