Android之實作系統聯系人軟體的分組和字母提示效果

聯系人分章節顯示以及ListView快速滑動顯示聯系人首字母例子，查閱網上很多這樣的例子後，發現普遍是從系統源碼裡面抽取的，而且普遍比較複雜，這裡做了精簡，擴充性較強，移植起來非常友善。

1.FastContactSearchDemoActivity.java

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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;
public class FastContactSearchDemoActivityextends Activity {
private BaseAdapter adapter;
private ListView personList;
private AsyncQueryHandler asyncQuery;
private staticfinal 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"); // 聯系人的Uri
String[] projection = { "_id","display_name","data1","sort_key" };// 查詢的列
asyncQuery.startQuery(0, null, uri, projection,null,null,
"sort_key COLLATE LOCALIZED asc");// 按照sort_key升序查詢
}
private class MyAsyncQueryHandlerextends AsyncQueryHandler {
public MyAsyncQueryHandler(ContentResolver cr) {
super(cr);
}
@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")) {// 去除多餘的中國地區号碼标志，對這個程式沒有影響。
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 staticclass ViewHolder {
TextView alpha;
TextView name;
TextView number;
}
private class ListAdapterextends BaseAdapterimplements SectionIndexer {
private LayoutInflater inflater;
private List<ContentValues> list;
private HashMap<String, Integer> alphaIndexer;//儲存每個索引在list中的位置【#-0，A-4，B-10】
private String[] sections;//每個分組的索引表【A,B,C,F...】
public ListAdapter(Context context, List<ContentValues> list) {
this.inflater = LayoutInflater.from(context);
this.list = list; // 該list是已經排序過的集合，有些項目中的資料必須要自己進行排序。
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)){//隻記錄在list中首次出現的位置
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);
// 目前聯系人的sortKey
String currentStr = getAlpha(list.get(position).getAsString(
SORT_KEY));
// 上一個聯系人的sortKey
String previewStr = (position - 1) >= 0 ? getAlpha(list.get(
position - 1).getAsString(SORT_KEY)) : " ";
if (!previewStr.equals(currentStr)) {// 目前聯系人的sortKey！=上一個聯系人的sortKey，說明目前聯系人是新組。
holder.alpha.setVisibility(View.VISIBLE);
holder.alpha.setText(currentStr);
} else {
holder.alpha.setVisibility(View.GONE);
}
return convertView;
}
@Override
public int getPositionForSection(int section) {
String later = sections[section];
return alphaIndexer.get(later);
}
@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;
}
}
private String getAlpha(String str) {
if (str == null) {
return "#";
}
if (str.trim().length() == 0) {
return "#";
}
char c = str.trim().substring(0, 1).charAt(0);
// 正規表達式，判斷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(); // 大寫輸出
} else {
return "#";
}
}
}

2.布局檔案

2.1.main.xml

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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns: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

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<?xmlversion="1.0"encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<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"/>
<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.效果圖

Android之實作系統聯系人軟體的分組和字母提示效果

Android之實作系統聯系人軟體的分組和字母提示效果

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