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！