分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
也欢迎大家转载本篇文章。分享知识，造福人民，实现我们中华民族伟大复兴！
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前段时间因为换工作的缘故又恰巧碰到国庆节，所以有段时间自己没有更新博客了，过完国庆到新公司报道，感觉还不错，就是现在住的地方离新公司有点远，地铁20站，伤不起啊，我每天早上7点多就要起床，然后屁颠屁颠的去挤地铁上班，晚上下班还要挤地铁，先不说路程远，车费一天就要10几块，我的银子啊，有坐龙华线去上班的深圳程序员不？听说那条线上班高峰期很挤？我没在上班高峰期坐过那趟车，我在民治那边找了个房子，离华强北也不远，关键房租便宜，哈哈，乐开花了，下个礼拜就要搬过去啦
不扯了，回到主题，今天给大家带来ListView的A-Z字母排序和过滤搜索功能并且实现汉字转成拼音的功能，我们知道一般我们对联系人，城市列表等实现A-Z的排序，因为联系人和城市列表我们可以直接从数据库中获取他的汉字拼音，而对于一般的数据，我们怎么实现A-Z的排序，我们需要将汉字转换成拼音就行了，接下来就带大家实现一般数据的A-Z排序功能，首先先看下效果图
上面是一个带删除按钮的EditText，我们在输入框中输入可以自动过滤出我们想要的东西，当输入框中没有数据自动替换到原来的数据列表，然后下面一个ListView用来显示数据列表，右侧是一个字母索引表，当我们点击不同的字母,ListView会定位到该字母地方，了解了布局之后，我们先看下项目结构吧
我按照项目中类的顺序来一一介绍其功能
1.SortModel 一个实体类，里面一个是ListView的name,另一个就是显示的name拼音的首字母
package com.example.sortlistview;public class SortModel { private String name; //显示的数据 private String sortLetters; //显示数据拼音的首字母 public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSortLetters() { return sortLetters; } public void setSortLetters(String sortLetters) { this.sortLetters = sortLetters; }}2.SideBar类就是ListView右侧的字母索引View，我们需要使用setTextView(TextView mTextDialog)来设置用来显示当前按下的字母的TextView,以及使用setOnTouchingLetterChangedListener方法来设置回调接口，在回调方法onTouchingLetterChanged(String s)中来处理不同的操作
package com.example.sortlistview;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Typeface;import android.graphics.drawable.ColorDrawable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.TextView;public class SideBar extends View { // 触摸事件 private OnTouchingLetterChangedListener onTouchingLetterChangedListener; // 26个字母 public static String[] b = { "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 int choose = -1;// 选中 private Paint paint = new Paint(); private TextView mTextDialog; /** * 为SideBar设置显示字母的TextView * @param mTextDialog */ public void setTextView(TextView mTextDialog) { this.mTextDialog = mTextDialog; } public SideBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public SideBar(Context context, AttributeSet attrs) { super(context, attrs); } public SideBar(Context context) { super(context); } /** * 重写这个方法 */ protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 获取焦点改变背景颜色. int height = getHeight();// 获取对应高度 int width = getWidth(); // 获取对应宽度 int singleHeight = height / b.length;// 获取每一个字母的高度 for (int i = 0; i < b.length; i++) { paint.setColor(Color.rgb(33, 65, 98)); // paint.setColor(Color.WHITE); paint.setTypeface(Typeface.DEFAULT_BOLD); paint.setAntiAlias(true); paint.setTextSize(20); // 选中的状态 if (i == choose) { paint.setColor(Color.parseColor("#3399ff")); paint.setFakeBoldText(true); } // x坐标等于中间-字符串宽度的一半. float xPos = width / 2 - paint.measureText(b[i]) / 2; float yPos = singleHeight * i + singleHeight; canvas.drawText(b[i], xPos, yPos, paint); paint.reset();// 重置画笔 } } @Override public boolean dispatchTouchEvent(MotionEvent event) { final int action = event.getAction(); final float y = event.getY();// 点击y坐标 final int oldChoose = choose; final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener; final int c = (int) (y / getHeight() * b.length);// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数. switch (action) { case MotionEvent.ACTION_UP: setBackgroundDrawable(new ColorDrawable(0x00000000)); choose = -1;// invalidate(); if (mTextDialog != null) { mTextDialog.setVisibility(View.INVISIBLE); } break; default: setBackgroundResource(R.drawable.sidebar_background); if (oldChoose != c) { if (c >= 0 && c < b.length) { if (listener != null) { listener.onTouchingLetterChanged(b[c]); } if (mTextDialog != null) { mTextDialog.setText(b[c]); mTextDialog.setVisibility(View.VISIBLE); } choose = c; invalidate(); } } break; } return true; } /** * 向外公开的方法 * * @param onTouchingLetterChangedListener */ public void setOnTouchingLetterChangedListener( OnTouchingLetterChangedListener onTouchingLetterChangedListener) { this.onTouchingLetterChangedListener = onTouchingLetterChangedListener; } /** * 接口 * * @author coder * */ public interface OnTouchingLetterChangedListener { public void onTouchingLetterChanged(String s); }}3.CharacterParser 这个类是将汉字转换成拼音的类，该拼音没有声调的，该类是单例类，其中定义了三个方法，在这个demo中用到的是getSelling(String chs)方法，将词组转换成拼音
package com.example.sortlistview;/** * Java汉字转换为拼音 * */public class CharacterParser { private static int[] pyvalue = new int[] {-20319, -20317, -20304, -20295, -20292, -20283, -20265, -20257, -20242, -20230, -20051, -20036, -20032, -20026, -20002, -19990, -19986, -19982, -19976, -19805, -19784, -19775, -19774, -19763, -19756, -19751, -19746, -19741, -19739, -19728, -19725, -19715, -19540, -19531, -19525, -19515, -19500, -19484, -19479, -19467, -19289, -19288, -19281, -19275, -19270, -19263, -19261, -19249, -19243, -19242, -19238, -19235, -19227, -19224, -19218, -19212, -19038, -19023, -19018, -19006, -19003, -18996, -18977, -18961, -18952, -18783, -18774, -18773, -18763, -18756, -18741, -18735, -18731, -18722, -18710, -18697, -18696, -18526, -18518, -18501, -18490, -18478, -18463, -18448, -18447, -18446, -18239, -18237, -18231, -18220, -18211, -18201, -18184, -18183, -18181, -18012, -17997, -17988, -17970, -17964, -17961, -17950, -17947, -17931, -17928, -17922, -17759, -17752, -17733, -17730, -17721, -17703, -17701, -17697, -17692, -17683, -17676, -17496, -17487, -17482, -17468, -17454, -17433, -17427, -17417, -17202, -17185, -16983, -16970, -16942, -16915, -16733, -16708, -16706, -16689, -16664, -16657, -16647, -16474, -16470, -16465, -16459, -16452, -16448, -16433, -16429, -16427, -16423, -16419, -16412, -16407, -16403, -16401, -16393, -16220, -16216, -16212, -16205, -16202, -16187, -16180, -16171, -16169, -16158, -16155, -15959, -15958, -15944, -15933, -15920, -15915, -15903, -15889, -15878, -15707, -15701, -15681, -15667, -15661, -15659, -15652, -15640, -15631, -15625, -15454, -15448, -15436, -15435, -15419, -15416, -15408, -15394, -15385, -15377, -15375, -15369, -15363, -15362, -15183, -15180, -15165, -15158, -15153, -15150, -15149, -15144, -15143, -15141, -15140, -15139, -15128, -15121, -15119, -15117, -15110, -15109, -14941, -14937, -14933, -14930, -14929, -14928, -14926, -14922, -14921, -14914, -14908, -14902, -14894, -14889, -14882, -14873, -14871, -14857, -14678, -14674, -14670, -14668, -14663, -14654, -14645, -14630, -14594, -14429, -14407, -14399, -14384, -14379, -14368, -14355, -14353, -14345, -14170, -14159, -14151, -14149, -14145, -14140, -14137, -14135, -14125, -14123, -14122, -14112, -14109, -14099, -14097, -14094, -14092, -14090, -14087, -14083, -13917, -13914, -13910, -13907, -13906, -13905, -13896, -13894, -13878, -13870, -13859, -13847, -13831, -13658, -13611, -13601, -13406, -13404, -13400, -13398, -13395, -13391, -13387, -13383, -13367, -13359, -13356, -13343, -13340, -13329, -13326, -13318, -13147, -13138, -13120, -13107, -13096, -13095, -13091, -13076, -13068, -13063, -13060, -12888, -12875, -12871, -12860, -12858, -12852, -12849, -12838, -12831, -12829, -12812, -12802, -12607, -12597, -12594, -12585, -12556, -12359, -12346, -12320, -12300, -12120, -12099, -12089, -12074, -12067, -12058, -12039, -11867, -11861, -11847, -11831, -11798, -11781, -11604, -11589, -11536, -11358, -11340, -11339, -11324, -11303, -11097, -11077, -11067, -11055, -11052, -11045, -11041, -11038, -11024, -11020, -11019, -11018, -11014, -10838, -10832, -10815, -10800, -10790, -10780, -10764, -10587, -10544, -10533, -10519, -10331, -10329, -10328, -10322, -10315, -10309, -10307, -10296, -10281, -10274, -10270, -10262, -10260, -10256, -10254}; public static String[] pystr = new String[] {"a", "ai", "an", "ang", "ao", "ba", "bai", "ban", "bang", "bao", "bei", "ben", "beng", "bi", "bian", "biao", "bie", "bin", "bing", "bo", "bu", "ca", "cai", "can", "cang", "cao", "ce", "ceng", "cha", "chai", "chan", "chang", "chao", "che", "chen", "cheng", "chi", "chong", "chou", "chu", "chuai", "chuan", "chuang", "chui", "chun", "chuo", "ci", "cong", "cou", "cu", "cuan", "cui", "cun", "cuo", "da", "dai", "dan", "dang", "dao", "de", "deng", "di", "dian", "diao", "die", "ding", "diu", "dong", "dou", "du", "duan", "dui", "dun", "duo", "e", "en", "er", "fa", "fan", "fang", "fei", "fen", "feng", "fo", "fou", "fu", "ga", "gai", "gan", "gang", "gao", "ge", "gei", "gen", "geng", "gong", "gou", "gu", "gua", "guai", "guan", "guang", "gui", "gun", "guo", "ha", "hai", "han", "hang", "hao", "he", "hei", "hen", "heng", "hong", "hou", "hu", "hua", "huai", "huan", "huang", "hui", "hun", "huo", "ji", "jia", "jian", "jiang", "jiao", "jie", "jin", "jing", "jiong", "jiu", "ju", "juan", "jue", "jun", "ka", "kai", "kan", "kang", "kao", "ke", "ken", "keng", "kong", "kou", "ku", "kua", "kuai", "kuan", "kuang", "kui", "kun", "kuo", "la", "lai", "lan", "lang", "lao", "le", "lei", "leng", "li", "lia", "lian", "liang", "liao", "lie", "lin", "ling", "liu", "long", "lou", "lu", "lv", "luan", "lue", "lun", "luo", "ma", "mai", "man", "mang", "mao", "me", "mei", "men", "meng", "mi", "mian", "miao", "mie", "min", "ming", "miu", "mo", "mou", "mu", "na", "nai", "nan", "nang", "nao", "ne", "nei", "nen", "neng", "ni", "nian", "niang", "niao", "nie", "nin", "ning", "niu", "nong", "nu", "nv", "nuan", "nue", "nuo", "o", "ou", "pa", "pai", "pan", "pang", "pao", "pei", "pen", "peng", "pi", "pian", "piao", "pie", "pin", "ping", "po", "pu", "qi", "qia", "qian", "qiang", "qiao", "qie", "qin", "qing", "qiong", "qiu", "qu", "quan", "que", "qun", "ran", "rang", "rao", "re", "ren", "reng", "ri", "rong", "rou", "ru", "ruan", "rui", "run", "ruo", "sa", "sai", "san", "sang", "sao", "se", "sen", "seng", "sha", "shai", "shan", "shang", "shao", "she", "shen", "sheng", "shi", "shou", "shu", "shua", "shuai", "shuan", "shuang", "shui", "shun", "shuo", "si", "song", "sou", "su", "suan", "sui", "sun", "suo", "ta", "tai", "tan", "tang", "tao", "te", "teng", "ti", "tian", "tiao", "tie", "ting", "tong", "tou", "tu", "tuan", "tui", "tun", "tuo", "wa", "wai", "wan", "wang", "wei", "wen", "weng", "wo", "wu", "xi", "xia", "xian", "xiang", "xiao", "xie", "xin", "xing", "xiong", "xiu", "xu", "xuan", "xue", "xun", "ya", "yan", "yang", "yao", "ye", "yi", "yin", "ying", "yo", "yong", "you", "yu", "yuan", "yue", "yun", "za", "zai", "zan", "zang", "zao", "ze", "zei", "zen", "zeng", "zha", "zhai", "zhan", "zhang", "zhao", "zhe", "zhen", "zheng", "zhi", "zhong", "zhou", "zhu", "zhua", "zhuai", "zhuan", "zhuang", "zhui", "zhun", "zhuo", "zi", "zong", "zou", "zu", "zuan", "zui", "zun", "zuo"}; private StringBuilder buffer; private String resource; private static CharacterParser characterParser = new CharacterParser(); public static CharacterParser getInstance() { return characterParser; } public String getResource() { return resource; } public void setResource(String resource) { this.resource = resource; } /** * 汉字转成ASCII码 * * @param chs * @return */ private int getChsAscii(String chs) { int asc = 0; try { byte[] bytes = chs.getBytes("gb2312"); if (bytes == null || bytes.length > 2 || bytes.length <= 0) { throw new RuntimeException("illegal resource string"); } if (bytes.length == 1) { asc = bytes[0]; } if (bytes.length == 2) { int hightByte = 256 + bytes[0]; int lowByte = 256 + bytes[1]; asc = (256 * hightByte + lowByte) - 256 * 256; } } catch (Exception e) { System.out.println("ERROR:ChineseSpelling.class-getChsAscii(String chs)" + e); } return asc; } /** * 单字解析 * * @param str * @return */ public String convert(String str) { String result = null; int ascii = getChsAscii(str); if (ascii > 0 && ascii < 160) { result = String.valueOf((char) ascii); } else { for (int i = (pyvalue.length - 1); i >= 0; i--) { if (pyvalue[i] <= ascii) { result = pystr[i]; break; } } } return result; } /** * 词组解析 * * @param chs * @return */ public String getSelling(String chs) { String key, value; buffer = new StringBuilder(); for (int i = 0; i < chs.length(); i++) { key = chs.substring(i, i + 1); if (key.getBytes().length >= 2) { value = (String) convert(key); if (value == null) { value = "unknown"; } } else { value = key; } buffer.append(value); } return buffer.toString(); } public String getSpelling() { return this.getSelling(this.getResource()); }}4.ClearEditText类是自定义的一个在右侧有删除图片的EditText，当然你也可以用Android原生的EditText，该类我之前有介绍，我这里就不贴上代码了Android 带清除功能的输入框控件ClearEditText,仿IOS的输入框
5.SortAdapter 数据的适配器类，该类需要实现SectionIndexer接口，该接口是用来控制ListView分组的，该接口有三个方法getSectionForPosition(int position)，getPositionForSection(int section)，getSections()，我们只需要自行实现前面两个方法
- getSectionForPosition(int position)是根据ListView的position来获取该位置上面的name的首字母char的ascii值，例如： 如果该position上面的name是阿妹，首字母就是A，那么此方法返回的就是'A'字母的ascii值，也就是65， 'B'是66，依次类推
- getPositionForSection(int section)就是根据首字母的ascii值来获取在该ListView中第一次出现该首字母的位置，例如：从上面的效果图1中，如果section是66 ，也就是‘B’的ascii值，那么该方法返回的position就是2
然后就是getView()方法，首先我们根据ListView的position调用getSectionForPosition(int position)来获取该位置上面name的首字母的ascii值,然后根据这个ascii值调用getPositionForSection(int section)来获取第一次出现该首字母的position，如果ListView的position 等于 根据这个ascii值调用getPositionForSection(int section)来获取第一次出现该首字母的position，则显示分类字母 否则隐藏
package com.example.sortlistview;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.SectionIndexer;import android.widget.TextView;public class SortAdapter extends BaseAdapter implements SectionIndexer{ private List<SortModel> list = null; private Context mContext; public SortAdapter(Context mContext, List<SortModel> list) { this.mContext = mContext; this.list = list; } /** * 当ListView数据发生变化时,调用此方法来更新ListView * @param list */ public void updateListView(List<SortModel> list){ this.list = list; notifyDataSetChanged(); } public int getCount() { return this.list.size(); } public Object getItem(int position) { return list.get(position); } public long getItemId(int position) { return position; } public View getView(final int position, View view, ViewGroup arg2) { ViewHolder viewHolder = null; final SortModel mContent = list.get(position); if (view == null) { viewHolder = new ViewHolder(); view = LayoutInflater.from(mContext).inflate(R.layout.item, null); viewHolder.tvTitle = (TextView) view.findViewById(R.id.title); viewHolder.tvLetter = (TextView) view.findViewById(R.id.catalog); view.setTag(viewHolder); } else { viewHolder = (ViewHolder) view.getTag(); } //根据position获取分类的首字母的char ascii值 int section = getSectionForPosition(position); //如果当前位置等于该分类首字母的Char的位置 ，则认为是第一次出现 if(position == getPositionForSection(section)){ viewHolder.tvLetter.setVisibility(View.VISIBLE); viewHolder.tvLetter.setText(mContent.getSortLetters()); }else{ viewHolder.tvLetter.setVisibility(View.GONE); } viewHolder.tvTitle.setText(this.list.get(position).getName()); return view; } final static class ViewHolder { TextView tvLetter; TextView tvTitle; } /** * 根据ListView的当前位置获取分类的首字母的char ascii值 */ public int getSectionForPosition(int position) { return list.get(position).getSortLetters().charAt(0); } /** * 根据分类的首字母的Char ascii值获取其第一次出现该首字母的位置 */ public int getPositionForSection(int section) { for (int i = 0; i < getCount(); i++) { String sortStr = list.get(i).getSortLetters(); char firstChar = sortStr.toUpperCase().charAt(0); if (firstChar == section) { return i; } } return -1; } @Override public Object[] getSections() { return null; }}6.MainActivity 这里面的代码比较简单，我们对ClearEditText设置addTextChangedListener监听，当输入框内容发生变化根据里面的值过滤ListView，里面的值为空显示原来的列表，里面对列表数据进行排序用到PinyinComparator接口，该接口主要是用来比较对象的
package com.example.sortlistview;import java.util.ArrayList;import java.util.Collections;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextUtils;import android.text.TextWatcher;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.example.sortlistview.SideBar.OnTouchingLetterChangedListener;public class MainActivity extends Activity { private ListView sortListView; private SideBar sideBar; /** * 显示字母的TextView */ private TextView dialog; private SortAdapter adapter; private ClearEditText mClearEditText; /** * 汉字转换成拼音的类 */ private CharacterParser characterParser; private List<SortModel> SourceDateList; /** * 根据拼音来排列ListView里面的数据类 */ private PinyinComparator pinyinComparator; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { //实例化汉字转拼音类 characterParser = CharacterParser.getInstance(); pinyinComparator = new PinyinComparator(); sideBar = (SideBar) findViewById(R.id.sidrbar); dialog = (TextView) findViewById(R.id.dialog); sideBar.setTextView(dialog); //设置右侧触摸监听 sideBar.setOnTouchingLetterChangedListener(new OnTouchingLetterChangedListener() { @Override public void onTouchingLetterChanged(String s) { //该字母首次出现的位置 int position = adapter.getPositionForSection(s.charAt(0)); if(position != -1){ sortListView.setSelection(position); } } }); sortListView = (ListView) findViewById(R.id.country_lvcountry); sortListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { //这里要利用adapter.getItem(position)来获取当前position所对应的对象 Toast.makeText(getApplication(), ((SortModel)adapter.getItem(position)).getName(), Toast.LENGTH_SHORT).show(); } }); SourceDateList = filledData(getResources().getStringArray(R.array.date)); // 根据a-z进行排序源数据 Collections.sort(SourceDateList, pinyinComparator); adapter = new SortAdapter(this, SourceDateList); sortListView.setAdapter(adapter); mClearEditText = (ClearEditText) findViewById(R.id.filter_edit); //根据输入框输入值的改变来过滤搜索 mClearEditText.addTextChangedListener(new TextWatcher() { @Override public void onTextChanged(CharSequence s, int start, int before, int count) { //当输入框里面的值为空，更新为原来的列表，否则为过滤数据列表 filterData(s.toString()); } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void afterTextChanged(Editable s) { } }); } /** * 为ListView填充数据 * @param date * @return */ private List<SortModel> filledData(String [] date){ List<SortModel> mSortList = new ArrayList<SortModel>(); for(int i=0; i<date.length; i++){ SortModel sortModel = new SortModel(); sortModel.setName(date[i]); //汉字转换成拼音 String pinyin = characterParser.getSelling(date[i]); String sortString = pinyin.substring(0, 1).toUpperCase(); // 正则表达式，判断首字母是否是英文字母 if(sortString.matches("[A-Z]")){ sortModel.setSortLetters(sortString.toUpperCase()); }else{ sortModel.setSortLetters("#"); } mSortList.add(sortModel); } return mSortList; } /** * 根据输入框中的值来过滤数据并更新ListView * @param filterStr */ private void filterData(String filterStr) { List<SortModel> filterDateList = new ArrayList<SortModel>(); if (TextUtils.isEmpty(filterStr)) { filterDateList = SourceDateList; } else { filterDateList.clear(); for (SortModel sortModel : SourceDateList) { String name = sortModel.getName(); if (name.toUpperCase().indexOf( filterStr.toString().toUpperCase()) != -1 || characterParser.getSelling(name).toUpperCase() .startsWith(filterStr.toString().toUpperCase())) { filterDateList.add(sortModel); } } } // 根据a-z进行排序 Collections.sort(filterDateList, pinyinComparator); adapter.updateListView(filterDateList); } }7.PinyinComparator接口用来对ListView中的数据根据A-Z进行排序，前面两个if判断主要是将不是以汉字开头的数据放在后面
package com.example.sortlistview;import java.util.Comparator;/** * * @author xiaanming * */public class PinyinComparator implements Comparator<SortModel> { public int compare(SortModel o1, SortModel o2) { //这里主要是用来对ListView里面的数据根据ABCDEFG...来排序 if (o2.getSortLetters().equals("#")) { return -1; } else if (o1.getSortLetters().equals("#")) { return 1; } else { return o1.getSortLetters().compareTo(o2.getSortLetters()); } }}这样我们以后使用A-Z排序就没要局限性了，想加这个效果随时都行，其他的布局和图片之类的文件就不贴出来了，如果大家有兴趣的自行去下载代码吧，如果大家有什么疑问，请在下面留言，我会为大家解答的！
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