Android手机联系人带字母索引的快速查找

喜欢另辟蹊径的我，在这里废话不多说了，直接上代码和图片了。
效果图如下：

第一步：MainActivity的代码如下：

package net.loonggg.test; 

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.TreeSet; 

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.LinearLayout.LayoutParams; 

public class MainActivity extends Activity {
  private HashMap<String, Integer> selector;// 存放含有索引字母的位置
  private LinearLayout layoutIndex;
  private ListView listView;
  private TextView tv_show;
  private ListViewAdapter adapter;
  private String[] indexStr = { "#", "A", "B", "C", "D", "E", "F", "G", "H",
      "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
      "V", "W", "X", "Y", "Z" };
  private List<Person> persons = null;
  private List<Person> newPersons = new ArrayList<Person>();
  private int height;// 字体高度
  private boolean flag = false; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // 去标题栏
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    layoutIndex = (LinearLayout) this.findViewById(R.id.layout);
    layoutIndex.setBackgroundColor(Color.parseColor("#00ffffff"));
    listView = (ListView) findViewById(R.id.listView);
    tv_show = (TextView) findViewById(R.id.tv);
    tv_show.setVisibility(View.GONE);
    setData();
    String[] allNames = sortIndex(persons);
    sortList(allNames); 

    selector = new HashMap<String, Integer>();
    for (int j = 0; j < indexStr.length; j++) {// 循环字母表，找出newPersons中对应字母的位置
      for (int i = 0; i < newPersons.size(); i++) {
        if (newPersons.get(i).getName().equals(indexStr[j])) {
          selector.put(indexStr[j], i);
        }
      } 

    }
    adapter = new ListViewAdapter(this, newPersons);
    listView.setAdapter(adapter);
  } 

  /**
   * 重新排序获得一个新的List集合
   *
   * @param allNames
   */
  private void sortList(String[] allNames) {
    for (int i = 0; i < allNames.length; i++) {
      if (allNames[i].length() != 1) {
        for (int j = 0; j < persons.size(); j++) {
          if (allNames[i].equals(persons.get(j).getPinYinName())) {
            Person p = new Person(persons.get(j).getName(), persons
                .get(j).getPinYinName());
            newPersons.add(p);
          }
        }
      } else {
        newPersons.add(new Person(allNames[i]));
      }
    }
  } 

  @Override
  public void onWindowFocusChanged(boolean hasFocus) {
    // 在oncreate里面执行下面的代码没反应，因为oncreate里面得到的getHeight=0
    if (!flag) {// 这里为什么要设置个flag进行标记，我这里不先告诉你们，请读者研究，因为这对你们以后的开发有好处
      height = layoutIndex.getMeasuredHeight() / indexStr.length;
      getIndexView();
      flag = true;
    }
  } 

  /**
   * 获取排序后的新数据
   *
   * @param persons
   * @return
   */
  public String[] sortIndex(List<Person> persons) {
    TreeSet<String> set = new TreeSet<String>();
    // 获取初始化数据源中的首字母，添加到set中
    for (Person person : persons) {
      set.add(StringHelper.getPinYinHeadChar(person.getName()).substring(
          0, 1));
    }
    // 新数组的长度为原数据加上set的大小
    String[] names = new String[persons.size() + set.size()];
    int i = 0;
    for (String string : set) {
      names[i] = string;
      i++;
    }
    String[] pinYinNames = new String[persons.size()];
    for (int j = 0; j < persons.size(); j++) {
      persons.get(j).setPinYinName(
          StringHelper
              .getPingYin(persons.get(j).getName().toString()));
      pinYinNames[j] = StringHelper.getPingYin(persons.get(j).getName()
          .toString());
    }
    // 将原数据拷贝到新数据中
    System.arraycopy(pinYinNames, 0, names, set.size(), pinYinNames.length);
    // 自动按照首字母排序
    Arrays.sort(names, String.CASE_INSENSITIVE_ORDER);
    return names;
  } 

  /**
   * 绘制索引列表
   */
  public void getIndexView() {
    LinearLayout.LayoutParams params = new LayoutParams(
        LayoutParams.WRAP_CONTENT, height);
    for (int i = 0; i < indexStr.length; i++) {
      final TextView tv = new TextView(this);
      tv.setLayoutParams(params);
      tv.setText(indexStr[i]);
      tv.setPadding(10, 0, 10, 0);
      layoutIndex.addView(tv);
      layoutIndex.setOnTouchListener(new OnTouchListener() { 

        @Override
        public boolean onTouch(View v, MotionEvent event) 

        {
          float y = event.getY();
          int index = (int) (y / height);
          if (index > -1 && index < indexStr.length) {// 防止越界
            String key = indexStr[index];
            if (selector.containsKey(key)) {
              int pos = selector.get(key);
              if (listView.getHeaderViewsCount() > 0) {// 防止ListView有标题栏，本例中没有。
                listView.setSelectionFromTop(
                    pos + listView.getHeaderViewsCount(), 0);
              } else {
                listView.setSelectionFromTop(pos, 0);// 滑动到第一项
              }
              tv_show.setVisibility(View.VISIBLE);
              tv_show.setText(indexStr[index]);
            }
          }
          switch (event.getAction()) {
          case MotionEvent.ACTION_DOWN:
            layoutIndex.setBackgroundColor(Color
                .parseColor("#606060"));
            break; 

          case MotionEvent.ACTION_MOVE: 

            break;
          case MotionEvent.ACTION_UP:
            layoutIndex.setBackgroundColor(Color
                .parseColor("#00ffffff"));
            tv_show.setVisibility(View.GONE);
            break;
          }
          return true;
        }
      });
    }
  } 

  /**
   * 设置模拟数据
   */
  private void setData() {
    persons = new ArrayList<Person>();
    Person p1 = new Person("耿琦");
    persons.add(p1);
    Person p2 = new Person("王宝强");
    persons.add(p2);
    Person p3 = new Person("柳岩");
    persons.add(p3);
    Person p4 = new Person("文章");
    persons.add(p4);
    Person p5 = new Person("马伊琍");
    persons.add(p5);
    Person p6 = new Person("李晨");
    persons.add(p6);
    Person p7 = new Person("张馨予");
    persons.add(p7);
    Person p8 = new Person("韩红");
    persons.add(p8);
    Person p9 = new Person("韩寒");
    persons.add(p9);
    Person p10 = new Person("丹丹");
    persons.add(p10);
    Person p11 = new Person("丹凤眼");
    persons.add(p11);
    Person p12 = new Person("哈哈");
    persons.add(p12);
    Person p13 = new Person("萌萌");
    persons.add(p13);
    Person p14 = new Person("蒙混");
    persons.add(p14);
    Person p15 = new Person("烟花");
    persons.add(p15);
    Person p16 = new Person("眼黑");
    persons.add(p16);
    Person p17 = new Person("许三多");
    persons.add(p17);
    Person p18 = new Person("程咬金");
    persons.add(p18);
    Person p19 = new Person("程哈哈");
    persons.add(p19);
    Person p20 = new Person("爱死你");
    persons.add(p20);
    Person p21 = new Person("阿莱");
    persons.add(p21); 

  } 

}

此Activity的布局文件如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="match_parent"
  android:background="#ffffff"
  android:orientation="vertical" > 

  <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:text="列表显示"
    android:textColor="#000000"
    android:textSize="16sp" /> 

  <FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff" > 

    <ListView
      android:id="@+id/listView"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:cacheColorHint="#00000000"
      android:fadingEdge="none"
      android:scrollbars="none" >
    </ListView> 

    <TextView
      android:id="@+id/tv"
      android:layout_width="60dp"
      android:layout_height="60dp"
      android:layout_gravity="center"
      android:background="#f0606060"
      android:gravity="center"
      android:text="A"
      android:textColor="#ffffff"
      android:textSize="30sp" /> 

    <LinearLayout
      android:id="@+id/layout"
      android:layout_width="wrap_content"
      android:layout_height="fill_parent"
      android:layout_gravity="right"
      android:background="#d7d7d7"
      android:gravity="center"
      android:orientation="vertical" >
    </LinearLayout>
  </FrameLayout> 

</LinearLayout> 

第二步：自定义了一个Adapter，代码如下：

package net.loonggg.test; 

import java.util.List; 

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView; 

public class ListViewAdapter extends BaseAdapter {
  private Context context;
  private List<Person> list;
  private ViewHolder viewHolder; 

  public ListViewAdapter(Context context, List<Person> list) {
    this.context = context;
    this.list = list;
  } 

  @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 boolean isEnabled(int position) {
    // TODO Auto-generated method stub
    if (list.get(position).getName().length() == 1)// 如果是字母索引
      return false;// 表示不能点击
    return super.isEnabled(position);
  } 

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    String item = list.get(position).getName();
    viewHolder = new ViewHolder();
    if (item.length() == 1) {
      convertView = LayoutInflater.from(context).inflate(R.layout.index,
          null);
      viewHolder.indexTv = (TextView) convertView
          .findViewById(R.id.indexTv);
    } else {
      convertView = LayoutInflater.from(context).inflate(R.layout.item,
          null);
      viewHolder.itemTv = (TextView) convertView
          .findViewById(R.id.itemTv);
    }
    if (item.length() == 1) {
      viewHolder.indexTv.setText(list.get(position).getName());
    } else {
      viewHolder.itemTv.setText(list.get(position).getName());
    }
    return convertView;
  } 

  private class ViewHolder {
    private TextView indexTv;
    private TextView itemTv;
  } 

} 

第三步：用到的ListView中的子布局文件如下：
1、index.xml布局文件代码如下：

<?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="wrap_content"
  android:background="#9c9c9c"
  android:orientation="vertical"
  android:paddingBottom="5dp"
  android:paddingLeft="10dp"
  android:paddingTop="5dp" > 

  <TextView
    android:id="@+id/indexTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#0f0f0f" /> 

</LinearLayout>

2、item.xml布局文件代码如下：

<?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="wrap_content"
  android:background="#ffffff"
  android:orientation="vertical"
  android:paddingBottom="5dp"
  android:paddingLeft="20dp"
  android:paddingTop="5dp" > 

  <TextView
    android:id="@+id/itemTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#000000"
    android:textSize="20sp" /> 

</LinearLayout> 

第四步：用到的实体类及工具类如下：
1、Person.java代码如下：

package net.loonggg.test; 

public class Person {
  private String name;
  private String pinYinName; 

  public Person(String name) {
    super();
    this.name = name;
  } 

  public Person(String name, String pinYinName) {
    super();
    this.name = name;
    this.pinYinName = pinYinName;
  } 

  public String getName() {
    return name;
  } 

  public void setName(String name) {
    this.name = name;
  } 

  public String getPinYinName() {
    return pinYinName;
  } 

  public void setPinYinName(String pinYinName) {
    this.pinYinName = pinYinName;
  } 

} 

2、工具类代码如下：

package net.loonggg.test; 

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.HanyuPinyinVCharType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination; 

public class StringHelper {
  /**
   * 得到 全拼
   *
   * @param src
   * @return
   */
  public static String getPingYin(String src) {
    char[] t1 = null;
    t1 = src.toCharArray();
    String[] t2 = new String[t1.length];
    HanyuPinyinOutputFormat t3 = new HanyuPinyinOutputFormat();
    t3.setCaseType(HanyuPinyinCaseType.LOWERCASE);
    t3.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
    t3.setVCharType(HanyuPinyinVCharType.WITH_V);
    String t4 = "";
    int t0 = t1.length;
    try {
      for (int i = 0; i < t0; i++) {
        // 判断是否为汉字字符
        if (java.lang.Character.toString(t1[i]).matches(
            "[\\u4E00-\\u9FA5]+")) {
          t2 = PinyinHelper.toHanyuPinyinStringArray(t1[i], t3);
          t4 += t2[0];
        } else {
          t4 += java.lang.Character.toString(t1[i]);
        }
      }
      return t4;
    } catch (BadHanyuPinyinOutputFormatCombination e1) {
      e1.printStackTrace();
    }
    return t4;
  } 

  /**
   * 得到首字母
   *
   * @param str
   * @return
   */
  public static String getHeadChar(String str) { 

    String convert = "";
    char word = str.charAt(0);
    String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word);
    if (pinyinArray != null) {
      convert += pinyinArray[0].charAt(0);
    } else {
      convert += word;
    }
    return convert.toUpperCase();
  } 

  /**
   * 得到中文首字母缩写
   *
   * @param str
   * @return
   */
  public static String getPinYinHeadChar(String str) { 

    String convert = "";
    for (int j = 0; j < str.length(); j++) {
      char word = str.charAt(j);
      String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word);
      if (pinyinArray != null) {
        convert += pinyinArray[0].charAt(0);
      } else {
        convert += word;
      }
    }
    return convert.toUpperCase();
  }
}

到这里就完事，非常简单吧！