Android之实现系统联系人软件的分组和字母提示效果

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http://blog.csdn.net/luck_apple/article/details/6741860 * 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 [e-mail] *  */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";@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);personList = (ListView) findViewById(R.id.listView);asyncQuery = new MyAsyncQueryHandler(getContentResolver());}@Overrideprotected void onResume() {super.onResume();Uri uri = Uri.parse("content://com.android.contacts/data/phones"); // 联系人的UriString[] 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 */@Overrideprotected 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);}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic 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sortKeyString currentStr = getAlpha(list.get(position).getAsString(SORT_KEY));// 上一个联系人的sortKeyString 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 */@Overridepublic int getPositionForSection(int section) {String later = sections[section];return alphaIndexer.get(later);}/* * 本例中可以不考虑这个方法 */@Overridepublic 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;}@Overridepublic 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 "#";}}}

2.布局文件

2.1.main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ListView        android:id="@+id/listView"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:fastScrollEnabled="true" /></LinearLayout>

2.2.list_item.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >        <!-- 首字母 -->    <TextView        android:id="@+id/alpha"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="#333333"        android:paddingLeft="10dip"        android:textColor="#FFFFFF"        android:visibility="gone" />        <!-- 联系人信息 -->    <ImageView        android:id="@+id/imageView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@id/alpha"        android:src="@drawable/ic_launcher" />    <TextView        android:id="@+id/name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@id/imageView"        android:layout_marginLeft="2.0dip"        android:layout_marginRight="5.0dip"        android:layout_marginTop="6.0dip"        android:layout_toRightOf="@id/imageView"        android:singleLine="true"        android:textAppearance="?android:textAppearanceMedium" />    <TextView        android:id="@+id/number"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@id/name"        android:layout_alignWithParentIfMissing="true"        android:layout_below="@id/name"        android:ellipsize="marquee"        android:singleLine="true"        android:textAppearance="?android:textAppearanceSmall" /></RelativeLayout>

3.效果图