import java.util.ArrayList;import java.util.Collections;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;/** * 這里是主布局 * @author lxd * */public class MainActivity extends Activity { private ListView lv_main; private FriendAdapter adapter; private List<Friend> data = new ArrayList<Friend>(); private QuickIndexView qiv_main; private TextView tv_main_word; private Handler handler = new Handler(){ public void handleMessage(android.os.Message msg) {  //隱藏word  tv_main_word.setVisibility(View.GONE); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv_main = (ListView) findViewById(R.id.lv_main); qiv_main = (QuickIndexView) findViewById(R.id.qiv_main); tv_main_word = (TextView) findViewById(R.id.tv_main_word); //設(shè)置監(jiān)聽 qiv_main.setOnIndexChangedListener(new QuickIndexView.OnIndexChangedListener() {  @Override  public void onIndexChanged(String word) {  tv_main_word.setText(word);  tv_main_word.setVisibility(View.VISIBLE);  //handler.removeMessages(1);  //移除未處理的消息  handler.removeCallbacksAndMessages(null);  //發(fā)延遲消息  handler.sendEmptyMessageDelayed(1, 2000);  //滑動listview  //查找對應(yīng)的item  for(int i=0;i<data.size();i++) {   String fWord = data.get(i).getPinyin().substring(0, 1);   if(word.equals(fWord)) {   lv_main.setSelection(i);   return;   }  }  }  @Override  public void onUp() {  //tv_main_word.setVisibility(View.GONE);  } }); //顯示列表 adapter = new FriendAdapter(); initData(); lv_main.setAdapter(adapter); //lv_main.setSelection(5); } private void initData() { data.add(new Friend("張三")); data.add(new Friend("楊九")); data.add(new Friend("胡繼群")); data.add(new Friend("劉暢")); data.add(new Friend("鐘澤興")); data.add(new Friend("尹革新")); data.add(new Friend("安傳鑫")); data.add(new Friend("張騫壬")); data.add(new Friend("溫松")); data.add(new Friend("李鳳秋")); data.add(new Friend("劉甫")); data.add(new Friend("婁全超")); data.add(new Friend("張猛")); data.add(new Friend("王英杰")); data.add(new Friend("李振南")); data.add(new Friend("孫仁政")); data.add(new Friend("唐春雷")); data.add(new Friend("牛鵬偉")); data.add(new Friend("姜宇航")); data.add(new Friend("劉挺")); data.add(new Friend("張洪瑞")); data.add(new Friend("張建忠")); data.add(new Friend("侯亞帥")); data.add(new Friend("劉帥")); data.add(new Friend("喬競飛")); data.add(new Friend("徐雨健")); data.add(new Friend("吳亮")); data.add(new Friend("王兆霖")); data.add(new Friend("阿三")); Collections.sort(data); } class FriendAdapter extends BaseAdapter { @Override public int getCount() {  return data.size(); } @Override public Object getItem(int position) {  return data.get(position); } @Override public long getItemId(int position) {  return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) {  ViewHolder holder = null;  if(convertView==null) {  holder = new ViewHolder();  convertView = View.inflate(MainActivity.this, R.layout.item_main, null);  holder.wordTV = (TextView) convertView.findViewById(R.id.tv_item_word);  holder.nameTV = (TextView) convertView.findViewById(R.id.tv_item_name);  convertView.setTag(holder);//***********?  } else {  holder = (ViewHolder) convertView.getTag();  }  Friend friend = data.get(position);  String word = friend.getPinyin().substring(0, 1);  holder.wordTV.setText(word);  holder.nameTV.setText(friend.getName());  //下標(biāo)為0的顯示  if(position==0) {  holder.wordTV.setVisibility(View.VISIBLE);  } else {  //取出上一個friend, 并得到的第一個word  String preWord = data.get(position-1).getPinyin().substring(0, 1);  //判斷是否于當(dāng)前行的word是否相同   //如果相同, 隱藏  if(word.equals(preWord)) {   holder.wordTV.setVisibility(View.GONE);  } else {   //如果不同, 顯示   holder.wordTV.setVisibility(View.VISIBLE);  }  }  return convertView; } class ViewHolder {  public TextView wordTV;  public TextView nameTV; } }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="${relativePackage}.${activityClass}" > <ListView android:id="@+id/lv_main" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> <!-- com.atguigu.quickindex.QuickIndexView --> <com.atguigu.quickindex.QuickIndexView android:id="@+id/qiv_main" android:layout_width="40dp" android:layout_height="match_parent" android:layout_alignParentRight="true" android:background="#ffffff" > </com.atguigu.quickindex.QuickIndexView> <TextView android:id="@+id/tv_main_word" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:background="#66666666" android:text="A"  android:textSize="40sp" android:gravity="center" android:visibility="gone"/></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tv_item_word" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="A"  android:background="#66666666" android:textSize="18sp" android:padding="5dp"/> <TextView android:id="@+id/tv_item_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="某人"  android:textSize="18sp" android:padding="5dp"/></LinearLayout>

import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * 這里是自定義View * @author lxd * */public class QuickIndexView extends View { private float itemWidth; private float itemHeight; // private float wordWidth; // private float wordHeight; private String[] indexArr = { "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 Paint paint; public QuickIndexView(Context context, AttributeSet attrs) { super(context, attrs); paint = new Paint(); paint.setColor(Color.WHITE); paint.setTextSize(16); paint.setAntiAlias(true); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); itemWidth = this.getMeasuredWidth(); itemHeight = this.getMeasuredHeight() / 26f; } @Override protected void onDraw(Canvas canvas) { //當(dāng)每次觸發(fā)重繪的時候，就把26個字母循環(huán)一遍 for (int i = 0; i < indexArr.length; i++) {  String word = indexArr[i];  // 設(shè)置文字的顏色  if (i == touchIndex) {  //這里設(shè)置被點(diǎn)擊的字母變化：顏色變灰色、字體變25sp  paint.setColor(Color.GRAY);  paint.setTextSize(25);  } else {  //其他沒被點(diǎn)擊的字母，保持原有狀態(tài)：設(shè)置顏色、字體大小為18sp  paint.setColor(Color.BLACK);  paint.setTextSize(18);  }  // 得到word的寬高  Rect bounds = new Rect();  paint.getTextBounds(word, 0, word.length(), bounds);  //得到字體的寬  int wordWidth = bounds.width();  //得到字體的高  int wordHeight = bounds.height();  // 計算word的左上角的坐標(biāo)：字母所在的X坐標(biāo)、Y坐標(biāo)  float x = itemWidth / 2 - wordWidth / 2;  float y = itemHeight / 2 + wordHeight / 2 + i * itemHeight;  // 繪制word  canvas.drawText(word, x, y, paint); } } // /////////////////////////////////////////////////////////////////////// private int touchIndex = -1;// 觸摸的字母的下標(biāo) @Override public boolean onTouchEvent(MotionEvent event) { // 得到事件坐標(biāo) float eventY = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE:  // 計算下標(biāo)  int index = (int) (eventY / itemHeight);  if (index > 25) {  index = 25;  }  if (index < 0) {  index = 0;  }  // 如果下標(biāo)有改變, 強(qiáng)制重繪  if (index != touchIndex) {  // 更新touchIndex  touchIndex = index;  // 強(qiáng)制重繪  invalidate();  // 通知Activity更新TextView  if (onIndexChangedListener != null) {   onIndexChangedListener.onIndexChanged(indexArr[index]);  }  }  break; case MotionEvent.ACTION_UP:  touchIndex = -1;  // 強(qiáng)制重繪  invalidate();  // 通知Activity更新TextView  if (onIndexChangedListener != null) {  onIndexChangedListener.onUp();  }  break; default:  break; } return true;// 所有的事件都由當(dāng)前視圖消費(fèi) } private OnIndexChangedListener onIndexChangedListener; /* * 設(shè)置監(jiān)聽對象的方法 這個方法一般是Activity調(diào)用 */ public void setOnIndexChangedListener(  OnIndexChangedListener onIndexChangedListener) { this.onIndexChangedListener = onIndexChangedListener; } interface OnIndexChangedListener { // 當(dāng)操作的下標(biāo)改變時自動調(diào)用 public void onIndexChanged(String word); // 當(dāng)up時調(diào)用 public void onUp(); }}

/** * 聯(lián)系人類 * @author lxd * */public class Friend implements Comparable<Friend> { private String name; private String pinyin; public Friend(String name) { super(); this.name = name; pinyin = PinYinUtils.getPinYin(name); } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPinyin() { return pinyin; } public void setPinyin(String pinyin) { this.pinyin = pinyin; } @Override public String toString() { return "Friend [name=" + name + ", pinyin=" + pinyin + "]"; } @Override public int compareTo(Friend another) { return this.pinyin.compareTo(another.getPinyin()); }}

/** * 將漢字轉(zhuǎn)換為拼音 * @author lxd * */public class PinYinUtils { /** * 得到指定漢字的拼音 * 注意:不應(yīng)該被頻繁調(diào)用，它消耗一定內(nèi)存 * @param hanzi * @return */ public static String getPinYin(String hanzi){ String pinyin = ""; HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();//控制轉(zhuǎn)換是否大小寫，是否帶音標(biāo) format.setCaseType(HanyuPinyinCaseType.UPPERCASE);//大寫 format.setToneType(HanyuPinyinToneType.WITHOUT_TONE); //由于不能直接對多個漢字轉(zhuǎn)換，只能對單個漢字轉(zhuǎn)換 char[] arr = hanzi.toCharArray(); for (int i = 0; i < arr.length; i++) {  if(Character.isWhitespace(arr[i]))continue;//如果是空格，則不處理，進(jìn)行下次遍歷  //漢字是2個字節(jié)存儲，肯定大于127，所以大于127就可以當(dāng)為漢字轉(zhuǎn)換  if(arr[i]>127){  try {   //由于多音字的存在，單 dan shan   String[] pinyinArr = PinyinHelper.toHanyuPinyinStringArray(arr[i], format);   if(pinyinArr!=null){   pinyin += pinyinArr[0];   }else {   pinyin += arr[i];   }  } catch (BadHanyuPinyinOutputFormatCombination e) {   e.printStackTrace();   //不是正確的漢字   pinyin += arr[i];  }  }else {  //不是漢字，  pinyin += arr[i];  } } return pinyin; }}