<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:background="#ffffff"><LinearLayoutandroid:id="@+id/sort_key_layout"android:layout_width="fill_parent"android:layout_height="18dip"android:layout_marginRight="15dp"android:background="#64a300"><TextViewandroid:id="@+id/sort_key"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginLeft="10dip"android:textColor="#ffffff"android:textSize="13sp" /></LinearLayout><LinearLayoutandroid:id="@+id/name_layout"android:layout_width="fill_parent"android:layout_height="60dip"android:orientation="vertical"><TextViewandroid:id="@+id/name"android:layout_width="wrap_content"android:layout_height="0dp"android:layout_weight="1"android:gravity="center_vertical"android:textColor="#303030"android:layout_marginLeft="15dp"android:text="李三"android:textSize="20sp" /><TextViewandroid:layout_width="match_parent"android:layout_height="1dp"android:layout_marginLeft="15dp"android:layout_marginRight="15dp"android:background="#4064a300" /></LinearLayout></LinearLayout>

在这个布局文件中，首先是放入了一个和前面完成一样的分组布局，因为不仅界面头部需要展示分组，在每个分组内的第一个无素之前都需要展示分组布局。然后是加入一个简单的LinearLayout，包含一个TextView用于显示联系人姓名。

这样我们的布局文件就全部写完了，下面开始来真正地实现功能。

先从简单的开始，新建一个PlayerInfo实体类:

package com.example.contactsdemo;import java.io.Serializable;/** 用户信息* auth:liyachao* date:2015/4/6*/
public class PlayerInfo {private String playerName;private String playerPhone;/*** 排序字母*/private String sortKey;public String getSortKey() {return sortKey;}public void setSortKey(String sortKey) {this.sortKey = sortKey;}public String getPlayerPhone() {return playerPhone;}public void setPlayerPhone(String playerPhone) {this.playerPhone = playerPhone;}public String getPlayerName() {return playerName;}public void setPlayerName(String playerName) {this.playerName = playerName;}}

这个实体类很简单，只包含了联系人姓名、排序键和联系人电话。

接下来完成联系人列表适配器的编写，新建一个ContactAdapter类继承自ArrayAdapter，加入如下代码：

package com.example.contactsdemo;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.SectionIndexer;
import android.widget.TextView;import java.util.List;/*** 联系人列表适配器。** @author guolin*/
public class ContactAdapter extends BaseAdapter {/*** 需要渲染的item布局文件*/private int resource;private Context context;private List<PlayerInfo> players;private boolean flag = true;/*** 字母表分组工具*/private SectionIndexer mIndexer;public ContactAdapter(Context context, int textViewResourceId, List<PlayerInfo> players) {resource = textViewResourceId;this.context = context;this.players = players;}@Overridepublic int getCount() {return players.size();}@Overridepublic PlayerInfo getItem(int position) {return players.get(position);}@Overridepublic long getItemId(int position) {return position;}public void dataChanged(List<PlayerInfo> players) {this.players = players;notifyDataSetChanged();flag = false;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {PlayerInfo contact = getItem(position);LinearLayout layout = null;if (convertView == null) {layout = (LinearLayout) LayoutInflater.from(context).inflate(resource, null);} else {layout = (LinearLayout) convertView;}TextView name = (TextView) layout.findViewById(R.id.name);LinearLayout sortKeyLayout = (LinearLayout) layout.findViewById(R.id.sort_key_layout);TextView sortKey = (TextView) layout.findViewById(R.id.sort_key);name.setText(contact.getPlayerName());if (flag) {int section = mIndexer.getSectionForPosition(position);if (position == mIndexer.getPositionForSection(section)) {sortKey.setText(contact.getSortKey());sortKeyLayout.setVisibility(View.VISIBLE);} else {sortKeyLayout.setVisibility(View.GONE);}} else {sortKeyLayout.setVisibility(View.GONE);}return layout;}/*** 给当前适配器传入一个分组工具。** @param indexer*/public void setIndexer(SectionIndexer indexer) {mIndexer = indexer;flag = true;}}

上面的代码中，最重要的就是getView方法，在这个方法中，我们首先判断是查找类型还是滑动页面类型，如果是查找类型，我们将头部的指示条就隐藏，如果不是再做判断，使用SectionIndexer的getSectionForPosition方法，通过当前的position值拿到了对应的section值，然后再反向通过刚刚拿到的section值，调用getPositionForSection方法，取回新的position值。如果当前的position值和新的position值是相等的，那么我们就可以认为当前position的项是某个分组下的第一个元素，我们应该将分组布局显示出来。

最后我们来编写程序的主界面，打开或新建MainActivity作为程序的主界面，代码如下所示：

package com.example.contactsdemo;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AlphabetIndexer;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;/*** chang date:2015/4/5 by liyachao*/
public class MainActivity extends Activity {private ListView lv;private EditText edittext;/*** 联系人总人数*/private int contactNumber;/*** 分组的布局*/private LinearLayout titleLayout;/*** 分组上显示的字母*/private TextView title;private ArrayList<PlayerInfo> allPlayerInfos;/*** 联系人列表适配器*/private ContactAdapter adapter;/*** 用于进行字母表分组*/private AlphabetIndexer indexer;private RelativeLayout sectionToastLayout;private TextView sectionToastText;private LinearLayout alphabetLayout;/*** A-Z的集合*/private List<TextView> alphabetList;/*** 定义字母表的排序规则*/private String alphabet = "#ABCDEFGHIJKLMNOPQRSTUVWXYZ";private int lastFirstVisibleItem = -1;/*** 电话号码**/private static final int PHONES_NUMBER_INDEX = 1;/*** 联系人显示名称**/private static final int PHONES_DISPLAY_NAME_INDEX = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);setControl();}private void setControl() {alphabetList = new ArrayList<TextView>();setAlphabetData();titleLayout = (LinearLayout) findViewById(R.id.title_layout1);title = (TextView) findViewById(R.id.title);sectionToastLayout = (RelativeLayout) findViewById(R.id.section_toast_layout);sectionToastText = (TextView) findViewById(R.id.section_toast_text);alphabetLayout = (LinearLayout) findViewById(R.id.alphabet_layout);lv = (ListView) findViewById(R.id.lv_select_contact);edittext = (EditText) findViewById(R.id.edittext);allPlayerInfos = getContactInfos();adapter = new ContactAdapter(this, R.layout.contact_item, allPlayerInfos);edittext.setHint("搜索" + contactNumber + "位联系人");adapter.setIndexer(indexer);if (allPlayerInfos.size() > 0) {setupContactsListView();setAlpabetListener();}/*** 向listview设置点击事件*/lv.setOnItemClickListener(new MyOnItemClickListener());/*** 向edittext设置监听事件*/edittext.addTextChangedListener(new MyTextWatcher());}/*** 根据填写的关键字在电话簿里寻找相关信息** @param name* @return*/private ArrayList<PlayerInfo> searchItem(String name) {ArrayList<PlayerInfo> mSearchList = new ArrayList<PlayerInfo>();for (int i = 0; i < allPlayerInfos.size(); i++) {int index = allPlayerInfos.get(i).getPlayerName().indexOf(name);// 存在匹配的数据if (index != -1) {mSearchList.add(allPlayerInfos.get(i));}}return mSearchList;}/*** 获取系统的所有的联系人信息.** @return*/public ArrayList<PlayerInfo> getContactInfos() {allPlayerInfos = new ArrayList<PlayerInfo>();ContentResolver resolver = getContentResolver();Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;Cursor phoneCursor = resolver.query(uri,new String[]{Phone.DISPLAY_NAME, Phone.NUMBER, Phone.SORT_KEY_PRIMARY}, null, null, Phone.SORT_KEY_PRIMARY);if (phoneCursor.moveToFirst()) {do {//得到手机号码String phoneNumber = phoneCursor.getString(PHONES_NUMBER_INDEX);String sortKey = getSortKey(phoneCursor.getString(2));//得到联系人名称String contactName = phoneCursor.getString(PHONES_DISPLAY_NAME_INDEX);PlayerInfo playerInfo = new PlayerInfo();playerInfo.setPlayerName(contactName);playerInfo.setPlayerPhone(phoneNumber);playerInfo.setSortKey(sortKey);allPlayerInfos.add(playerInfo);} while (phoneCursor.moveToNext());}contactNumber = allPlayerInfos.size();startManagingCursor(phoneCursor);indexer = new AlphabetIndexer(phoneCursor, 2, alphabet);return allPlayerInfos;}/*** 获取sort key的首个字符，如果是英文字母就直接返回，否则返回#。** @param sortKeyString 数据库中读取出的sort key* @return 英文字母或者#*/private String getSortKey(String sortKeyString) {alphabetLayout.getHeight();String key = sortKeyString.substring(0, 1).toUpperCase();if (key.matches("[A-Z]")) {return key;}return "#";}/*** 为联系人ListView设置监听事件，* 根据当前的滑动状态来改变分组的显示位置，* 从而实现挤压动画的效果。* auth:liyachao*/private void setupContactsListView() {lv.setAdapter(adapter);lv.setOnScrollListener(new AbsListView.OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,int totalItemCount) {int section = indexer.getSectionForPosition(firstVisibleItem);int nextSecPosition = indexer.getPositionForSection(section + 1);setSortAlphabet(section);if (firstVisibleItem != lastFirstVisibleItem) {ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) titleLayout.getLayoutParams();params.topMargin = 0;titleLayout.setLayoutParams(params);title.setText(String.valueOf(alphabet.charAt(section)));}if (nextSecPosition == firstVisibleItem + 1) {View childView = view.getChildAt(0);if (childView != null) {int titleHeight = titleLayout.getHeight();int bottom = childView.getBottom();ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) titleLayout.getLayoutParams();if (bottom < titleHeight) {float pushedDistance = bottom - titleHeight;params.topMargin = (int) pushedDistance;titleLayout.setLayoutParams(params);} else {if (params.topMargin != 0) {params.topMargin = 0;titleLayout.setLayoutParams(params);}}}}lastFirstVisibleItem = firstVisibleItem;}});}/*** 设置默认的字幕背景和字体颜色*/private void setSortAlphabet(int section) {TextView tv;for (int i = 0; i < 27; i++) {if (section == i) {tv = alphabetList.get(section);tv.setTextColor(Color.parseColor("#ffffff"));tv.setBackgroundResource(R.drawable.text_bg_frame);} else {tv = alphabetList.get(i);tv.setTextColor(Color.parseColor("#303030"));tv.setBackgroundColor(Color.parseColor("#ffffff"));}tv.setGravity(Gravity.CENTER);}}/*** 设置字母表上的触摸事件，根据当前触摸的位置结合字母表的高度，* 计算出当前触摸在哪个字母上。* 当手指按在字母表上时，展示弹出式分组。手指离开字母表时，* 将弹出式分组隐藏。* auth:liyachao*/private void setAlpabetListener() {alphabetLayout.setOnTouchListener(new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {float alphabetHeight = alphabetLayout.getHeight();float y = event.getY();int sectionPosition = (int) ((y / alphabetHeight) / (1f / 27f));if (sectionPosition < 0) {sectionPosition = 0;} else if (sectionPosition > 26) {sectionPosition = 26;}String sectionLetter = String.valueOf(alphabet.charAt(sectionPosition));int position = indexer.getPositionForSection(sectionPosition);switch (event.getAction()) {case MotionEvent.ACTION_DOWN:alphabetList.get(sectionPosition).setTextColor(Color.parseColor("#ffffff"));alphabetList.get(sectionPosition).setBackgroundResource(R.drawable.text_bg_frame);sectionToastLayout.setVisibility(View.VISIBLE);sectionToastText.setText(sectionLetter);lv.setSelection(position);break;case MotionEvent.ACTION_MOVE:setSortAlphabet(sectionPosition);sectionToastText.setText(sectionLetter);lv.setSelection(position);break;default:setSortAlphabet(sectionPosition);sectionToastLayout.setVisibility(View.GONE);}return true;}});}class MyOnItemClickListener implements OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {String name = ((PlayerInfo) parent.getItemAtPosition(position)).getPlayerName() + "";String phone = ((PlayerInfo) parent.getItemAtPosition(position)).getPlayerPhone() + "";String str = name + "的电话为： " + phone;Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();}}class MyTextWatcher implements TextWatcher {@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {}@Overridepublic void afterTextChanged(Editable s) {String str = s.toString();if (str.equals("")) {adapter.dataChanged(allPlayerInfos);adapter.setIndexer(indexer);titleLayout.setVisibility(View.VISIBLE);} else {Log.i("tag", "name111: " + str);ArrayList<PlayerInfo> temp;temp = searchItem(str.trim());adapter.dataChanged(temp);titleLayout.setVisibility(View.GONE);}lv.setAdapter(adapter);}}private void setAlphabetData() {TextView jing = (TextView) findViewById(R.id.contact_);alphabetList.add(jing);TextView A = (TextView) findViewById(R.id.contact_A);alphabetList.add(A);TextView B = (TextView) findViewById(R.id.contact_B);alphabetList.add(B);TextView C = (TextView) findViewById(R.id.contact_C);alphabetList.add(C);TextView D = (TextView) findViewById(R.id.contact_D);alphabetList.add(D);TextView E = (TextView) findViewById(R.id.contact_E);alphabetList.add(E);TextView F = (TextView) findViewById(R.id.contact_F);alphabetList.add(F);TextView G = (TextView) findViewById(R.id.contact_G);alphabetList.add(G);TextView H = (TextView) findViewById(R.id.contact_H);alphabetList.add(H);TextView I = (TextView) findViewById(R.id.contact_I);alphabetList.add(I);TextView J = (TextView) findViewById(R.id.contact_J);alphabetList.add(J);TextView K = (TextView) findViewById(R.id.contact_K);alphabetList.add(K);TextView L = (TextView) findViewById(R.id.contact_L);alphabetList.add(L);TextView M = (TextView) findViewById(R.id.contact_M);alphabetList.add(M);TextView N = (TextView) findViewById(R.id.contact_N);alphabetList.add(N);TextView O = (TextView) findViewById(R.id.contact_O);alphabetList.add(O);TextView P = (TextView) findViewById(R.id.contact_P);alphabetList.add(P);TextView Q = (TextView) findViewById(R.id.contact_Q);alphabetList.add(Q);TextView R1 = (TextView) findViewById(R.id.contact_R);alphabetList.add(R1);TextView S = (TextView) findViewById(R.id.contact_S);alphabetList.add(S);TextView T = (TextView) findViewById(R.id.contact_T);alphabetList.add(T);TextView U = (TextView) findViewById(R.id.contact_U);alphabetList.add(U);TextView V = (TextView) findViewById(R.id.contact_V);alphabetList.add(V);TextView W = (TextView) findViewById(R.id.contact_W);alphabetList.add(W);TextView X = (TextView) findViewById(R.id.contact_X);alphabetList.add(X);TextView Y = (TextView) findViewById(R.id.contact_Y);alphabetList.add(Y);TextView Z = (TextView) findViewById(R.id.contact_Z);alphabetList.add(Z);}}

最后要记住，要在AndroidManifest.xml给出读取手机联系人的权限声明：