联系人分章节显示以及ListView快速滑动显示联系人首字母例子，查阅网上很多这样的例子后，发现普遍是从系统源码里面抽取的，而且普遍比较复杂，这里做了精简，扩展性较强，移植起来非常方便。
1.FastContactSearchDemoActivity.java
package com.zhf.FastContactSearchDemo;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import Android.app.Activity;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.SectionIndexer;
import android.widget.TextView;
/**
* 联系人分章节显示以及ListView快速滑动显示联系人首字母例子
* 本例来自
* 查阅网上很多这样的例子后，发现普遍是从系统源码里面抽取的，而且普遍比较复杂，这里做了精简，扩展性较强，移植起来非常方便。
* @author hiphonezhu@sina.com
*
*/
public class FastContactSearchDemoActivity extends Activity {
private BaseAdapter adapter;
private ListView personList;
private AsyncQueryHandler asyncQuery;
private static final String NAME = "name", NUMBER = "number",
SORT_KEY = "sort_key";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
personList = (ListView) findViewById(R.id.listView);
asyncQuery = new MyAsyncQueryHandler(getContentResolver());
}
@Override
protected void onResume() {
super.onResume();
Uri uri = Uri.parse("content://com.android.contacts/data/phones"); // 联系人的Uri
String[] projection = { "_id", "display_name", "data1", "sort_key" }; // 查询的列
asyncQuery.startQuery(0, null, uri, projection, null, null,
"sort_key COLLATE LOCALIZED asc"); // 按照sort_key升序查询
}
/**
* 数据库异步查询类AsyncQueryHandler
*
* @author administrator
*
*/
private class MyAsyncQueryHandler extends AsyncQueryHandler {
public MyAsyncQueryHandler(ContentResolver cr) {
super(cr);
}
/**
* 查询结束的回调函数
*/
@Override
protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
if (cursor != null && cursor.getCount() > 0) {
List<ContentValues> list = new ArrayList<ContentValues>();
cursor.moveToFirst();
for (int i = 0; i < cursor.getCount(); i++) {
ContentValues cv = new ContentValues();
cursor.moveToPosition(i);
String name = cursor.getString(1);
String number = cursor.getString(2);
String sortKey = cursor.getString(3);
if (number.startsWith("+86")) {// 去除多余的中国地区号码标志，对这个程序没有影响。
cv.put(NAME, name);
cv.put(NUMBER, number.substring(3));
cv.put(SORT_KEY, sortKey);
} else {
cv.put(NAME, name);
cv.put(NUMBER, number);
cv.put(SORT_KEY, sortKey);
}
list.add(cv);
}
if (list.size() > 0) {
setAdapter(list);
}
}
}
}
private void setAdapter(List<ContentValues> list) {
adapter = new ListAdapter(this, list);
personList.setAdapter(adapter);
}
private static class ViewHolder {
TextView alpha;
TextView name;
TextView number;
}
/**
* 其他项目使用时，只需要传进来一个有序的list即可
*/
private class ListAdapter extends BaseAdapter implements SectionIndexer {
private LayoutInflater inflater;
private List<ContentValues> list;
private HashMap<String, Integer> alphaIndexer;//保存每个索引在list中的位置【#-0，A-4，B-10】
private String[] sections;//每个分组的索引表【A,B,C,F...】
public ListAdapter(Context context, List<ContentValues> list) {
this.inflater = LayoutInflater.from(context);
this.list = list; // 该list是已经排序过的集合，有些项目中的数据必须要自己进行排序。
this.alphaIndexer = new HashMap<String, Integer>();
for (int i =0; i <list.size(); i++) {
String name = getAlpha(list.get(i).getAsString(SORT_KEY));
if(!alphaIndexer.containsKey(name)){//只记录在list中首次出现的位置
alphaIndexer.put(name, i);
}
}
Set<String> sectionLetters = alphaIndexer.keySet();
ArrayList<String> sectionList = new ArrayList<String>(
sectionLetters);
Collections.sort(sectionList);
sections = new String[sectionList.size()];
sectionList.toArray(sections);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
holder.alpha = (TextView) convertView.findViewById(R.id.alpha);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.number = (TextView) convertView
.findViewById(R.id.number);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
ContentValues cv = list.get(position);
String name = cv.getAsString(NAME);
String number = cv.getAsString(NUMBER);
holder.name.setText(name);
holder.number.setText(number);
// 当前联系人的sortKey
String currentStr = getAlpha(list.get(position).getAsString(
SORT_KEY));
// 上一个联系人的sortKey
String previewStr = (position - 1) >= 0 ? getAlpha(list.get(
position - 1).getAsString(SORT_KEY)) : " ";
/**
* 判断显示#、A-Z的TextView隐藏与可见
*/
if (!previewStr.equals(currentStr)) { // 当前联系人的sortKey！=上一个联系人的sortKey，说明当前联系人是新组。
holder.alpha.setVisibility(View.VISIBLE);
holder.alpha.setText(currentStr);
} else {
holder.alpha.setVisibility(View.GONE);
}
return convertView;
}
/*
* 此方法根据联系人的首字母返回在list中的位置
*/
@Override
public int getPositionForSection(int section) {
String later = sections[section];
return alphaIndexer.get(later);
}
/*
* 本例中可以不考虑这个方法
*/
@Override
public int getSectionForPosition(int position) {
String key = getAlpha(list.get(position).getAsString(SORT_KEY));
for (int i = 0; i < sections.length; i++) {
if (sections[i].equals(key)) {
return i;
}
}
return 0;
}
@Override
public Object[] getSections() {
return sections;
}
}
/**
* 提取英文的首字母，非英文字母用#代替
*
* @param str
* @return
*/
private String getAlpha(String str) {
if (str == null) {
return "#";
}
if (str.trim().length() == 0) {
return "#";
}
char c = str.trim().substring(0, 1).charAt(0);
// 正则表达式，判断首字母是否是英文字母
Pattern pattern = Pattern.compile("^[A-Za-z]+{1}quot;);
if (pattern.matcher(c + "").matches()) {
return (c + "").toUpperCase(); // 大写输出
} else {
return "#";
}
}
}