关于结对编程项目（Sports club）

对该app好友功能的阐述
package com.lolo.my361.activity.memberset;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.lolo.my361.activity.slyday.R;
import com.lolo.my361.adapter.memberset.MyFriendsAdapter;
import com.lolo.my361.entity.Friend;
import com.lolo.my361.view.LetterlistViewForFriend;
import com.lolo.my361.view.LetterlistViewForFriend.OnTouchingLetterChangedListener;
import android.app.Activity;
import android.content.Context;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;

public class MyFriendsActivity extends Activity {
ListView lv_friend;
String[] strings;// 存放存在的汉语拼音首字母
List friends;
//右边字母导航
LetterlistViewForFriend letterlistViewForFriend;
HashMap<String, Integer> alphaIndex;// 存放存在的汉语拼音首字母和与之对应的列表位置
TextView overlay;
Handler handler;
OverlayThread overlayThread; // 隐藏字母提示框

@Override
protected void onCreate(Bundle savedInstanceState) {
	// TODO Auto-generated method stub
	super.onCreate(savedInstanceState);
	setContentView(R.layout.vip_myactivity_myfriend);
	overlayThread = new OverlayThread();
	handler = new Handler();
	/* 初始化右边导航 */
	initOverlay();

/* 初始化通讯录 */
initData();
lv_friend = (ListView) this.findViewById(R.id.vip_myfriend_lv_1);

	lv_friend.setAdapter(new MyFriendsAdapter(MyFriendsActivity.this,
			friends));
	lv_friend.setOnItemClickListener(new OnItemClickListener() {

		@Override
		public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
				long arg3) {
			// TODO Auto-generated method stub

		}

	});
	
	letterlistViewForFriend=(LetterlistViewForFriend)this.findViewById(R.id.LetterlistViewForFriend);
	letterlistViewForFriend.setOnTouchingLetterChangedListener(new OnTouchingLetterChangedListener() {
		
		@Override
		public void onTouchingLetterChanged(String s) {
			// TODO Auto-generated method stub
			System.out.println(s);
			int position = alphaIndex.get(s);
			if (alphaIndex.get(s) != null) {
				lv_friend.setSelection(position);
			}
			overlay.setText(s);
			overlay.setVisibility(View.VISIBLE);
			handler.removeCallbacks(overlayThread);
			// 延迟一秒后执行，让overlay为不可见
			handler.postDelayed(overlayThread, 1500);
		}
	});

}

// 初始化汉语拼音首字母弹出提示框
private void initOverlay() {
LayoutInflater inflater = LayoutInflater.from(this);
overlay = (TextView) inflater.inflate(R.layout.overlay_layout, null);
overlay.setVisibility(View.INVISIBLE);
WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_APPLICATION,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
PixelFormat.TRANSLUCENT);
WindowManager windowManager = (WindowManager) this
.getSystemService(Context.WINDOW_SERVICE);
windowManager.addView(overlay, lp);
}

public class OverlayThread implements Runnable {

	@Override
	public void run() {
		// TODO Auto-generated method stub
		overlay.setVisibility(View.INVISIBLE);
	}

}

数据库，对好友的查询功能

private void initData() {
	List<String> list_data = new ArrayList<String>();
	list_data.add("Alex");
	list_data.add("Blic");
	list_data.add("Blpha");
	list_data.add("Clex");
	list_data.add("Clic");
	list_data.add("Clpha");
	list_data.add("Clex");
	list_data.add("Dlic");
	list_data.add("Dlpha");
	list_data.add("Dace");
	list_data.add("Dlpha");
	list_data.add("Elic");
	list_data.add("Elpha");
	list_data.add("Eace");
	list_data.add("Elpha");
	list_data.add("Elea");
	list_data.add("Flpha");
	list_data.add("Flea");
	list_data.add("Glpha");
	list_data.add("Gace");
	list_data.add("Glpha");
	list_data.add("Hlea");
	list_data.add("Ilpha");
	list_data.add("Jace");
	list_data.add("Jlpha");
	list_data.add("Jlea");
	list_data.add("Kace");
	list_data.add("Klpha");
	list_data.add("Klea");
	list_data.add("Lace");
	list_data.add("Llpha");
	list_data.add("Mlea");
	list_data.add("Mlea");
	list_data.add("Nlea");
	list_data.add("Olea");
	list_data.add("Plea");
	list_data.add("Qlpha");
	list_data.add("Qlea");
	list_data.add("Race");
	list_data.add("Rlpha");
	list_data.add("Slea");
	list_data.add("Slea");
	list_data.add("Tea");
	list_data.add("Tea");
	list_data.add("Tea");
	list_data.add("Uea");
	list_data.add("Uea");
	list_data.add("Uea");
	list_data.add("Vea");
	list_data.add("Wea");
	list_data.add("Wea");
	list_data.add("Yea");
	list_data.add("Yea");
	list_data.add("Yea");
	list_data.add("Yea");
	list_data.add("Yea");
	list_data.add("Zea");

	friends = new ArrayList<Friend>();
	alphaIndex = new HashMap<String, Integer>();

	for (int i = 0; i < list_data.size(); i++) {
		Friend friend = new Friend();
		friend.setName(list_data.get(i));
		friends.add(friend);
	}
	strings = new String[friends.size()];
	for (int i = 0; i < friends.size(); i++) {
		char letter = friends.get(i).getName().substring(0, 1).charAt(0);
		String currentLetter = (letter + "").toUpperCase();
		// 上一个汉语拼音首字母，如果不存在为""
		String lastLetter = (i - 1) > 0 ? (friends.get(i - 1).getName()
				.substring(0, 1).charAt(0) + "").toUpperCase() : "";
		if (!lastLetter.equals(currentLetter)) {
			alphaIndex.put(currentLetter, i);
			strings[i]=currentLetter;
		}

	}

}

@Override
protected void onDestroy() {
	// TODO Auto-generated method stub
	super.onDestroy();
	WindowManager windowManager = (WindowManager) this
			.getSystemService(Context.WINDOW_SERVICE);
	windowManager.removeView(overlay);
}

}