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 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 persons = null; 
  private List newPersons = new ArrayList(); 
  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(); 
    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); 
  } 
 
   
  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; 
    } 
  } 
 
   
  public String[] sortIndex(List persons) { 
    TreeSet set = new TreeSet(); 
    // 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; 
  } 
 
   
  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; 
 } 
      }); 
    } 
  } 
 
   
  private void setData() { 
    persons = new ArrayList(); 
    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：

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 list; 
  private ViewHolder viewHolder; 
 
  public ListViewAdapter(Context context, List 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：

2、item.xml布局文件代码如下：

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 { 
   
  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; 
  } 
 
   
  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(); 
  } 
   
   
  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！