android app搜索中模糊匹配的处理

       好久没有写东西了，最近在android ics 上加个search app 或者widget的功能，支持模糊匹配，感觉还挺有意思，跟大家分享一下。

       首先需要一个工具类，将汉字转化为拼音，这里我是直接挪用系统的ContactsProvider中的HanziToPinyin.java文件，顺便说一下这个类在android系统中处理多音字及某些汉字时不准确，在普通java project中调用此工具类不起作用，原因尚未知。

      为了支持模糊匹配，有两个关键步骤：

      1、在加载所有应用信息时，将每个app对应的拼接字符串保存到缓存，数据类型HashMap。

      2、在搜索时，用输入的搜索字符串逐个与缓存中的字符串匹配。

      以“联系人”应用为例，讲述两种种拼接、匹配算法：

   1、获得“联系人”的拼接字符串为：联LIAN系XI人REN 。

      依照这种拼接方式将所有的appName——>ApplicationInfo的映射保存到appMap。

      根据条件进行匹配时，将输入字符串拆分成char型数组，如果第一个元素包含在appName（得到index）中，再判断第二个元素是否包含在   appName.subString(index+1)  中，依次类推。如果都匹配，则符合条件，否则，任一个不匹配都不符合。代码如下：

      具体拼接方法就不写了，很简单。

      //匹配

     public boolean isAmbiguousMatch(String source, String input) {
        input = input.replace(" ", "").toUpperCase();
        if(source.contains(input)){
            return true;
        }               
        char[] charArray = input.toCharArray();
        int i = 0;
        int index = 0;
        for(; i < charArray.length && index < source.length(); i++){
            index = source.indexOf(String.valueOf(charArray[i]), index);
            if(index < 0){
                return false;
            }
            index++;
        }
        if(i < charArray.length){
            return false;
        }
        else{
            return true;
        }
    }

          这种拼接算法优点：对搜索关键字没要求，搜索结果覆盖面广。

          缺点：搜索结果覆盖面太广，给用户的感觉就是搜索的结果不准确。

 

  2、获得“联系人”的拼接字符串为：联系人 LIANXIREN LXR

     依照这种拼接方式将所有的appName——>ApplicationInfo的映射保存到appMap。

      代码如下：

     //拼接字符串
     private String getConcatenateString(String input){
        ArrayList tokenList= HanziToPinyin.getInstance().get(input.toUpperCase());
        String result = null;
        boolean hasChinese = false;
        StringBuffer source = new StringBuffer();
        StringBuffer target = new StringBuffer();
        StringBuffer firstLetters = new StringBuffer();
        for(Token token : tokenList){
            source.append(token.source);
            target.append(token.target);
            firstLetters.append(token.target.substring(0, 1));
            if(token.type == Token.PINYIN && !hasChinese){
                hasChinese = true;
            }
        }
        if(hasChinese){
            result = source.append(" ").append(target).append(" ").append(firstLetters).toString();
        }
        else if(tokenList.size() == 1){
            result = source.toString();
        }
        else{
            result = source.append(" ").append(firstLetters).toString();
        }
        source = null;
        target = null;
        firstLetters = null;
        return result;
    }

      //specific match principle:  if input string has space, then split it and check if each of the splited item is contained in source string.
                               else check if input string is contained in source string.

      public boolean isAmbiguousMatch(String source, String input) {
        input = input.trim().toUpperCase();
        if(input.contains(" ")){
            String[] items = input.split(" ");
            for(int i = 0; i < items.length; i++){
                if(!source.contains(items[i])){
                    return false;
                }
            }
            return true;
        }
        else if(source.contains(input)){
            return true;
        }
        return false;
    }

   这种拼接算法优点：支持全拼、部分全拼、首字母组合等，搜索结果更精准。

   缺点：不支持中英文混合搜索。

附上HanziToPinyin.java的源码如下：

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.test;

import android.text.TextUtils;
import android.util.Log;

import java.text.Collator;
import java.util.ArrayList;
import java.util.Locale;

/**
 * An object to convert Chinese character to its corresponding pinyin string. For characters with
 * multiple possible pinyin string, only one is selected according to collator. Polyphone is not
 * supported in this implementation. This class is implemented to achieve the best runtime
 * performance and minimum runtime resources with tolerable sacrifice of accuracy. This
 * implementation highly depends on zh_CN ICU collation data and must be always synchronized with
 * ICU.
 *
 * Currently this file is aligned to zh.txt in ICU 4.6
 */
public class HanziToPinyin {
    private static final String TAG = "HanziToPinyin";

    // Turn on this flag when we want to check internal data structure.
    private static final boolean DEBUG = false;

    /**
     * Unihans array. Each unihans is the first one within same pinyin. Use it to determine pinyin
     * for all ~20k unihans.
     */
    public static final char[] UNIHANS = {
            '\u5475', '\u54ce', '\u5b89', '\u80ae', '\u51f9',
            '\u516b', '\u6300', '\u6273', '\u90a6', '\u5305', '\u5351', '\u5954', '\u4f3b',
            '\u5c44', '\u8fb9', '\u6807', '\u618b', '\u90a0', '\u69df', '\u7676', '\u5cec',
            '\u5693', '\u5a47', '\u98e1', '\u4ed3', '\u64cd', '\u518a', '\u5d7e', '\u564c',
            '\u53c9', '\u9497', '\u8fbf', '\u4f25', '\u6284', '\u8f66', '\u62bb', '\u67fd',
            '\u5403', '\u5145', '\u62bd', '\u51fa', '\u6b3b', '\u63e3', '\u5ddd', '\u75ae',
            '\u5439', '\u6776', '\u9034', '\u75b5', '\u5306', '\u51d1', '\u7c97', '\u6c46',
            '\u5d14', '\u90a8', '\u6413', '\u5491', '\u5927', '\u75b8', '\u5f53', '\u5200',
            '\u6dc2', '\u5f97', '\u6265', '\u706f', '\u6c10', '\u55f2', '\u7538', '\u5201',
            '\u7239', '\u4ec3', '\u4e1f', '\u4e1c', '\u5517', '\u561f', '\u5073', '\u5806',
            '\u9413', '\u591a', '\u5a40', '\u8bf6', '\u5940', '\u97a5', '\u800c', '\u53d1',
            '\u5e06', '\u65b9', '\u98de', '\u5206', '\u4e30', '\u8985', '\u4ecf', '\u7d11',
            '\u4f15', '\u65ee', '\u8be5', '\u7518', '\u5188', '\u768b', '\u6208', '\u7d66',
            '\u6839', '\u5e9a', '\u5de5', '\u52fe', '\u4f30', '\u74dc', '\u7f6b', '\u5173',
            '\u5149', '\u5f52', '\u886e', '\u5459', '\u54c8', '\u54b3', '\u9878', '\u82c0',
            '\u84bf', '\u8bc3', '\u9ed2', '\u62eb', '\u4ea8', '\u5677', '\u543d', '\u9f41',
            '\u5322', '\u82b1', '\u6000', '\u72bf', '\u5ddf', '\u7070', '\u660f', '\u5419',
            '\u4e0c', '\u52a0', '\u620b', '\u6c5f', '\u827d', '\u9636', '\u5dfe', '\u52a4',
            '\u5182', '\u52fc', '\u530a', '\u5a1f', '\u5658', '\u519b', '\u5494', '\u5f00',
            '\u520a', '\u95f6', '\u5c3b', '\u533c', '\u524b', '\u80af', '\u962c', '\u7a7a',
            '\u62a0', '\u5233', '\u5938', '\u84af', '\u5bbd', '\u5321', '\u4e8f', '\u5764',
            '\u6269', '\u5783', '\u6765', '\u5170', '\u5577', '\u635e', '\u4ec2', '\u52d2',
            '\u5844', '\u5215', '\u5006', '\u5941', '\u826f', '\u64a9', '\u5217', '\u62ce',
            '\u3007', '\u6e9c', '\u9f99', '\u779c', '\u565c', '\u5a08', '\u7567', '\u62a1',
            '\u7f57', '\u5463', '\u5988', '\u973e', '\u5ada', '\u9099', '\u732b', '\u9ebc',
            '\u6c92', '\u95e8', '\u753f', '\u54aa', '\u7720', '\u55b5', '\u54a9', '\u6c11',
            '\u540d', '\u8c2c', '\u6478', '\u54de', '\u6bea', '\u62cf', '\u5b7b', '\u56e1',
            '\u56ca', '\u5b6c', '\u8bb7', '\u9981', '\u6041', '\u80fd', '\u59ae', '\u62c8',
            '\u5b22', '\u9e1f', '\u634f', '\u60a8', '\u5b81', '\u599e', '\u519c', '\u7fba',
            '\u5974', '\u597b', '\u8650', '\u632a', '\u5594', '\u8bb4', '\u8db4', '\u62cd',
            '\u7705', '\u4e53', '\u629b', '\u5478', '\u55b7', '\u5309', '\u4e15', '\u504f',
            '\u527d', '\u6c15', '\u59d8', '\u4e52', '\u948b', '\u5256', '\u4ec6', '\u4e03',
            '\u6390', '\u5343', '\u545b', '\u6084', '\u767f', '\u4fb5', '\u9751', '\u909b',
            '\u4e18', '\u66f2', '\u5f2e', '\u7f3a', '\u590b', '\u5465', '\u7a63', '\u5a06',
            '\u60f9', '\u4eba', '\u6254', '\u65e5', '\u8338', '\u53b9', '\u5982', '\u5827',
            '\u6875', '\u95f0', '\u82e5', '\u4ee8', '\u6be2', '\u4e09', '\u6852', '\u63bb',
            '\u8272', '\u68ee', '\u50e7', '\u6740', '\u7b5b', '\u5c71', '\u4f24', '\u5f30',
            '\u5962', '\u7533', '\u5347', '\u5c38', '\u53ce', '\u4e66', '\u5237', '\u6454',
            '\u95e9', '\u53cc', '\u8c01', '\u542e', '\u5981', '\u53b6', '\u5fea', '\u635c',
            '\u82cf', '\u72fb', '\u590a', '\u5b59', '\u5506', '\u4ed6', '\u82d4', '\u574d',
            '\u94f4', '\u5932', '\u5fd1', '\u71a5', '\u5254', '\u5929', '\u4f7b', '\u5e16',
            '\u5385', '\u56f2', '\u5077', '\u92c0', '\u6e4d', '\u63a8', '\u541e', '\u6258',
            '\u6316', '\u6b6a', '\u5f2f', '\u5c2a', '\u5371', '\u586d', '\u7fc1', '\u631d',
            '\u5140', '\u5915', '\u867e', '\u4eda', '\u4e61', '\u7071', '\u4e9b', '\u5fc3',
            '\u661f', '\u51f6', '\u4f11', '\u65f4', '\u8f69', '\u75b6', '\u52cb', '\u4e2b',
            '\u6079', '\u592e', '\u5e7a', '\u8036', '\u4e00', '\u6b2d', '\u5e94', '\u54df',
            '\u4f63', '\u4f18', '\u625c', '\u9e22', '\u66f0', '\u6655', '\u531d', '\u707d',
            '\u7ccc', '\u7242', '\u50ae', '\u5219', '\u8d3c', '\u600e', '\u5897', '\u5412',
            '\u635a', '\u6cbe', '\u5f20', '\u948a', '\u8707', '\u8d1e', '\u4e89', '\u4e4b',
            '\u4e2d', '\u5dde', '\u6731', '\u6293', '\u8de9', '\u4e13', '\u5986', '\u96b9',
            '\u5b92', '\u5353', '\u5b5c', '\u5b97', '\u90b9', '\u79df', '\u94bb', '\u539c',
            '\u5c0a', '\u6628', };

    /**
     * Pinyin array. Each pinyin is corresponding to unihans of same offset in the unihans array.
     */
    public static final byte[][] PINYINS = {
            { 65, 0, 0, 0, 0, 0 }, { 65, 73, 0, 0, 0, 0 }, { 65, 78, 0, 0, 0, 0 },
            { 65, 78, 71, 0, 0, 0 }, { 65, 79, 0, 0, 0, 0 }, { 66, 65, 0, 0, 0, 0 },
            { 66, 65, 73, 0, 0, 0 }, { 66, 65, 78, 0, 0, 0 }, { 66, 65, 78, 71, 0, 0 },
            { 66, 65, 79, 0, 0, 0 }, { 66, 69, 73, 0, 0, 0 }, { 66, 69, 78, 0, 0, 0 },
            { 66, 69, 78, 71, 0, 0 }, { 66, 73, 0, 0, 0, 0 }, { 66, 73, 65, 78, 0, 0 },
            { 66, 73, 65, 79, 0, 0 }, { 66, 73, 69, 0, 0, 0 }, { 66, 73, 78, 0, 0, 0 },
            { 66, 73, 78, 71, 0, 0 }, { 66, 79, 0, 0, 0, 0 }, { 66, 85, 0, 0, 0, 0 },
            { 67, 65, 0, 0, 0, 0 }, { 67, 65, 73, 0, 0, 0 },
            { 67, 65, 78, 0, 0, 0 }, { 67, 65, 78, 71, 0, 0 }, { 67, 65, 79, 0, 0, 0 },
            { 67, 69, 0, 0, 0, 0 }, { 67, 69, 78, 0, 0, 0 }, { 67, 69, 78, 71, 0, 0 },
            { 67, 72, 65, 0, 0, 0 }, { 67, 72, 65, 73, 0, 0 }, { 67, 72, 65, 78, 0, 0 },
            { 67, 72, 65, 78, 71, 0 }, { 67, 72, 65, 79, 0, 0 }, { 67, 72, 69, 0, 0, 0 },
            { 67, 72, 69, 78, 0, 0 }, { 67, 72, 69, 78, 71, 0 }, { 67, 72, 73, 0, 0, 0 },
            { 67, 72, 79, 78, 71, 0 }, { 67, 72, 79, 85, 0, 0 }, { 67, 72, 85, 0, 0, 0 },
            { 67, 72, 85, 65, 0, 0 }, { 67, 72, 85, 65, 73, 0 }, { 67, 72, 85, 65, 78, 0 },
            { 67, 72, 85, 65, 78, 71 }, { 67, 72, 85, 73, 0, 0 }, { 67, 72, 85, 78, 0, 0 },
            { 67, 72, 85, 79, 0, 0 }, { 67, 73, 0, 0, 0, 0 }, { 67, 79, 78, 71, 0, 0 },
            { 67, 79, 85, 0, 0, 0 }, { 67, 85, 0, 0, 0, 0 }, { 67, 85, 65, 78, 0, 0 },
            { 67, 85, 73, 0, 0, 0 }, { 67, 85, 78, 0, 0, 0 }, { 67, 85, 79, 0, 0, 0 },
            { 68, 65, 0, 0, 0, 0 }, { 68, 65, 73, 0, 0, 0 }, { 68, 65, 78, 0, 0, 0 },
            { 68, 65, 78, 71, 0, 0 }, { 68, 65, 79, 0, 0, 0 }, { 68, 69, 0, 0, 0, 0 },
            { 68, 69, 73, 0, 0, 0 }, { 68, 69, 78, 0, 0, 0 }, { 68, 69, 78, 71, 0, 0 },
            { 68, 73, 0, 0, 0, 0 }, { 68, 73, 65, 0, 0, 0 }, { 68, 73, 65, 78, 0, 0 },
            { 68, 73, 65, 79, 0, 0 }, { 68, 73, 69, 0, 0, 0 }, { 68, 73, 78, 71, 0, 0 },
            { 68, 73, 85, 0, 0, 0 }, { 68, 79, 78, 71, 0, 0 }, { 68, 79, 85, 0, 0, 0 },
            { 68, 85, 0, 0, 0, 0 }, { 68, 85, 65, 78, 0, 0 }, { 68, 85, 73, 0, 0, 0 },
            { 68, 85, 78, 0, 0, 0 }, { 68, 85, 79, 0, 0, 0 }, { 69, 0, 0, 0, 0, 0 },
            { 69, 73, 0, 0, 0, 0 }, { 69, 78, 0, 0, 0, 0 }, { 69, 78, 71, 0, 0, 0 },
            { 69, 82, 0, 0, 0, 0 }, { 70, 65, 0, 0, 0, 0 }, { 70, 65, 78, 0, 0, 0 },
            { 70, 65, 78, 71, 0, 0 }, { 70, 69, 73, 0, 0, 0 }, { 70, 69, 78, 0, 0, 0 },
            { 70, 69, 78, 71, 0, 0 }, { 70, 73, 65, 79, 0, 0 }, { 70, 79, 0, 0, 0, 0 },
            { 70, 79, 85, 0, 0, 0 }, { 70, 85, 0, 0, 0, 0 }, { 71, 65, 0, 0, 0, 0 },
            { 71, 65, 73, 0, 0, 0 }, { 71, 65, 78, 0, 0, 0 }, { 71, 65, 78, 71, 0, 0 },
            { 71, 65, 79, 0, 0, 0 }, { 71, 69, 0, 0, 0, 0 }, { 71, 69, 73, 0, 0, 0 },
            { 71, 69, 78, 0, 0, 0 }, { 71, 69, 78, 71, 0, 0 }, { 71, 79, 78, 71, 0, 0 },
            { 71, 79, 85, 0, 0, 0 }, { 71, 85, 0, 0, 0, 0 }, { 71, 85, 65, 0, 0, 0 },
            { 71, 85, 65, 73, 0, 0 }, { 71, 85, 65, 78, 0, 0 }, { 71, 85, 65, 78, 71, 0 },
            { 71, 85, 73, 0, 0, 0 }, { 71, 85, 78, 0, 0, 0 }, { 71, 85, 79, 0, 0, 0 },
            { 72, 65, 0, 0, 0, 0 }, { 72, 65, 73, 0, 0, 0 }, { 72, 65, 78, 0, 0, 0 },
            { 72, 65, 78, 71, 0, 0 }, { 72, 65, 79, 0, 0, 0 }, { 72, 69, 0, 0, 0, 0 },
            { 72, 69, 73, 0, 0, 0 }, { 72, 69, 78, 0, 0, 0 }, { 72, 69, 78, 71, 0, 0 },
            { 72, 77, 0, 0, 0, 0 }, { 72, 79, 78, 71, 0, 0 }, { 72, 79, 85, 0, 0, 0 },
            { 72, 85, 0, 0, 0, 0 }, { 72, 85, 65, 0, 0, 0 }, { 72, 85, 65, 73, 0, 0 },
            { 72, 85, 65, 78, 0, 0 }, { 72, 85, 65, 78, 71, 0 }, { 72, 85, 73, 0, 0, 0 },
            { 72, 85, 78, 0, 0, 0 }, { 72, 85, 79, 0, 0, 0 }, { 74, 73, 0, 0, 0, 0 },
            { 74, 73, 65, 0, 0, 0 }, { 74, 73, 65, 78, 0, 0 }, { 74, 73, 65, 78, 71, 0 },
            { 74, 73, 65, 79, 0, 0 }, { 74, 73, 69, 0, 0, 0 }, { 74, 73, 78, 0, 0, 0 },
            { 74, 73, 78, 71, 0, 0 }, { 74, 73, 79, 78, 71, 0 }, { 74, 73, 85, 0, 0, 0 },
            { 74, 85, 0, 0, 0, 0 }, { 74, 85, 65, 78, 0, 0 }, { 74, 85, 69, 0, 0, 0 },
            { 74, 85, 78, 0, 0, 0 }, { 75, 65, 0, 0, 0, 0 }, { 75, 65, 73, 0, 0, 0 },
            { 75, 65, 78, 0, 0, 0 }, { 75, 65, 78, 71, 0, 0 }, { 75, 65, 79, 0, 0, 0 },
            { 75, 69, 0, 0, 0, 0 }, { 75, 69, 73, 0, 0, 0 }, { 75, 69, 78, 0, 0, 0 },
            { 75, 69, 78, 71, 0, 0 }, { 75, 79, 78, 71, 0, 0 }, { 75, 79, 85, 0, 0, 0 },
            { 75, 85, 0, 0, 0, 0 }, { 75, 85, 65, 0, 0, 0 }, { 75, 85, 65, 73, 0, 0 },
            { 75, 85, 65, 78, 0, 0 }, { 75, 85, 65, 78, 71, 0 }, { 75, 85, 73, 0, 0, 0 },
            { 75, 85, 78, 0, 0, 0 }, { 75, 85, 79, 0, 0, 0 }, { 76, 65, 0, 0, 0, 0 },
            { 76, 65, 73, 0, 0, 0 }, { 76, 65, 78, 0, 0, 0 }, { 76, 65, 78, 71, 0, 0 },
            { 76, 65, 79, 0, 0, 0 }, { 76, 69, 0, 0, 0, 0 }, { 76, 69, 73, 0, 0, 0 },
            { 76, 69, 78, 71, 0, 0 }, { 76, 73, 0, 0, 0, 0 }, { 76, 73, 65, 0, 0, 0 },
            { 76, 73, 65, 78, 0, 0 }, { 76, 73, 65, 78, 71, 0 }, { 76, 73, 65, 79, 0, 0 },
            { 76, 73, 69, 0, 0, 0 }, { 76, 73, 78, 0, 0, 0 }, { 76, 73, 78, 71, 0, 0 },
            { 76, 73, 85, 0, 0, 0 }, { 76, 79, 78, 71, 0, 0 }, { 76, 79, 85, 0, 0, 0 },
            { 76, 85, 0, 0, 0, 0 }, { 76, 85, 65, 78, 0, 0 }, { 76, 85, 69, 0, 0, 0 },
            { 76, 85, 78, 0, 0, 0 }, { 76, 85, 79, 0, 0, 0 }, { 77, 0, 0, 0, 0, 0 },
            { 77, 65, 0, 0, 0, 0 }, { 77, 65, 73, 0, 0, 0 }, { 77, 65, 78, 0, 0, 0 },
            { 77, 65, 78, 71, 0, 0 }, { 77, 65, 79, 0, 0, 0 }, { 77, 69, 0, 0, 0, 0 },
            { 77, 69, 73, 0, 0, 0 }, { 77, 69, 78, 0, 0, 0 }, { 77, 69, 78, 71, 0, 0 },
            { 77, 73, 0, 0, 0, 0 }, { 77, 73, 65, 78, 0, 0 }, { 77, 73, 65, 79, 0, 0 },
            { 77, 73, 69, 0, 0, 0 }, { 77, 73, 78, 0, 0, 0 }, { 77, 73, 78, 71, 0, 0 },
            { 77, 73, 85, 0, 0, 0 }, { 77, 79, 0, 0, 0, 0 }, { 77, 79, 85, 0, 0, 0 },
            { 77, 85, 0, 0, 0, 0 }, { 78, 65, 0, 0, 0, 0 }, { 78, 65, 73, 0, 0, 0 },
            { 78, 65, 78, 0, 0, 0 }, { 78, 65, 78, 71, 0, 0 }, { 78, 65, 79, 0, 0, 0 },
            { 78, 69, 0, 0, 0, 0 }, { 78, 69, 73, 0, 0, 0 }, { 78, 69, 78, 0, 0, 0 },
            { 78, 69, 78, 71, 0, 0 }, { 78, 73, 0, 0, 0, 0 }, { 78, 73, 65, 78, 0, 0 },
            { 78, 73, 65, 78, 71, 0 }, { 78, 73, 65, 79, 0, 0 }, { 78, 73, 69, 0, 0, 0 },
            { 78, 73, 78, 0, 0, 0 }, { 78, 73, 78, 71, 0, 0 }, { 78, 73, 85, 0, 0, 0 },
            { 78, 79, 78, 71, 0, 0 }, { 78, 79, 85, 0, 0, 0 }, { 78, 85, 0, 0, 0, 0 },
            { 78, 85, 65, 78, 0, 0 }, { 78, 85, 69, 0, 0, 0 }, { 78, 85, 79, 0, 0, 0 },
            { 79, 0, 0, 0, 0, 0 }, { 79, 85, 0, 0, 0, 0 }, { 80, 65, 0, 0, 0, 0 },
            { 80, 65, 73, 0, 0, 0 }, { 80, 65, 78, 0, 0, 0 }, { 80, 65, 78, 71, 0, 0 },
            { 80, 65, 79, 0, 0, 0 }, { 80, 69, 73, 0, 0, 0 }, { 80, 69, 78, 0, 0, 0 },
            { 80, 69, 78, 71, 0, 0 }, { 80, 73, 0, 0, 0, 0 }, { 80, 73, 65, 78, 0, 0 },
            { 80, 73, 65, 79, 0, 0 }, { 80, 73, 69, 0, 0, 0 }, { 80, 73, 78, 0, 0, 0 },
            { 80, 73, 78, 71, 0, 0 }, { 80, 79, 0, 0, 0, 0 }, { 80, 79, 85, 0, 0, 0 },
            { 80, 85, 0, 0, 0, 0 }, { 81, 73, 0, 0, 0, 0 }, { 81, 73, 65, 0, 0, 0 },
            { 81, 73, 65, 78, 0, 0 }, { 81, 73, 65, 78, 71, 0 }, { 81, 73, 65, 79, 0, 0 },
            { 81, 73, 69, 0, 0, 0 }, { 81, 73, 78, 0, 0, 0 }, { 81, 73, 78, 71, 0, 0 },
            { 81, 73, 79, 78, 71, 0 }, { 81, 73, 85, 0, 0, 0 }, { 81, 85, 0, 0, 0, 0 },
            { 81, 85, 65, 78, 0, 0 }, { 81, 85, 69, 0, 0, 0 }, { 81, 85, 78, 0, 0, 0 },
            { 82, 65, 78, 0, 0, 0 }, { 82, 65, 78, 71, 0, 0 }, { 82, 65, 79, 0, 0, 0 },
            { 82, 69, 0, 0, 0, 0 }, { 82, 69, 78, 0, 0, 0 }, { 82, 69, 78, 71, 0, 0 },
            { 82, 73, 0, 0, 0, 0 }, { 82, 79, 78, 71, 0, 0 }, { 82, 79, 85, 0, 0, 0 },
            { 82, 85, 0, 0, 0, 0 }, { 82, 85, 65, 78, 0, 0 }, { 82, 85, 73, 0, 0, 0 },
            { 82, 85, 78, 0, 0, 0 }, { 82, 85, 79, 0, 0, 0 }, { 83, 65, 0, 0, 0, 0 },
            { 83, 65, 73, 0, 0, 0 }, { 83, 65, 78, 0, 0, 0 }, { 83, 65, 78, 71, 0, 0 },
            { 83, 65, 79, 0, 0, 0 }, { 83, 69, 0, 0, 0, 0 }, { 83, 69, 78, 0, 0, 0 },
            { 83, 69, 78, 71, 0, 0 }, { 83, 72, 65, 0, 0, 0 }, { 83, 72, 65, 73, 0, 0 },
            { 83, 72, 65, 78, 0, 0 }, { 83, 72, 65, 78, 71, 0 }, { 83, 72, 65, 79, 0, 0 },
            { 83, 72, 69, 0, 0, 0 }, { 83, 72, 69, 78, 0, 0 }, { 83, 72, 69, 78, 71, 0 },
            { 83, 72, 73, 0, 0, 0 }, { 83, 72, 79, 85, 0, 0 }, { 83, 72, 85, 0, 0, 0 },
            { 83, 72, 85, 65, 0, 0 }, { 83, 72, 85, 65, 73, 0 }, { 83, 72, 85, 65, 78, 0 },
            { 83, 72, 85, 65, 78, 71 }, { 83, 72, 85, 73, 0, 0 }, { 83, 72, 85, 78, 0, 0 },
            { 83, 72, 85, 79, 0, 0 }, { 83, 73, 0, 0, 0, 0 }, { 83, 79, 78, 71, 0, 0 },
            { 83, 79, 85, 0, 0, 0 }, { 83, 85, 0, 0, 0, 0 }, { 83, 85, 65, 78, 0, 0 },
            { 83, 85, 73, 0, 0, 0 }, { 83, 85, 78, 0, 0, 0 }, { 83, 85, 79, 0, 0, 0 },
            { 84, 65, 0, 0, 0, 0 }, { 84, 65, 73, 0, 0, 0 }, { 84, 65, 78, 0, 0, 0 },
            { 84, 65, 78, 71, 0, 0 }, { 84, 65, 79, 0, 0, 0 }, { 84, 69, 0, 0, 0, 0 },
            { 84, 69, 78, 71, 0, 0 }, { 84, 73, 0, 0, 0, 0 }, { 84, 73, 65, 78, 0, 0 },
            { 84, 73, 65, 79, 0, 0 }, { 84, 73, 69, 0, 0, 0 }, { 84, 73, 78, 71, 0, 0 },
            { 84, 79, 78, 71, 0, 0 }, { 84, 79, 85, 0, 0, 0 }, { 84, 85, 0, 0, 0, 0 },
            { 84, 85, 65, 78, 0, 0 }, { 84, 85, 73, 0, 0, 0 }, { 84, 85, 78, 0, 0, 0 },
            { 84, 85, 79, 0, 0, 0 }, { 87, 65, 0, 0, 0, 0 }, { 87, 65, 73, 0, 0, 0 },
            { 87, 65, 78, 0, 0, 0 }, { 87, 65, 78, 71, 0, 0 }, { 87, 69, 73, 0, 0, 0 },
            { 87, 69, 78, 0, 0, 0 }, { 87, 69, 78, 71, 0, 0 }, { 87, 79, 0, 0, 0, 0 },
            { 87, 85, 0, 0, 0, 0 }, { 88, 73, 0, 0, 0, 0 }, { 88, 73, 65, 0, 0, 0 },
            { 88, 73, 65, 78, 0, 0 }, { 88, 73, 65, 78, 71, 0 }, { 88, 73, 65, 79, 0, 0 },
            { 88, 73, 69, 0, 0, 0 }, { 88, 73, 78, 0, 0, 0 }, { 88, 73, 78, 71, 0, 0 },
            { 88, 73, 79, 78, 71, 0 }, { 88, 73, 85, 0, 0, 0 }, { 88, 85, 0, 0, 0, 0 },
            { 88, 85, 65, 78, 0, 0 }, { 88, 85, 69, 0, 0, 0 }, { 88, 85, 78, 0, 0, 0 },
            { 89, 65, 0, 0, 0, 0 }, { 89, 65, 78, 0, 0, 0 }, { 89, 65, 78, 71, 0, 0 },
            { 89, 65, 79, 0, 0, 0 }, { 89, 69, 0, 0, 0, 0 }, { 89, 73, 0, 0, 0, 0 },
            { 89, 73, 78, 0, 0, 0 }, { 89, 73, 78, 71, 0, 0 }, { 89, 79, 0, 0, 0, 0 },
            { 89, 79, 78, 71, 0, 0 }, { 89, 79, 85, 0, 0, 0 }, { 89, 85, 0, 0, 0, 0 },
            { 89, 85, 65, 78, 0, 0 }, { 89, 85, 69, 0, 0, 0 }, { 89, 85, 78, 0, 0, 0 },
            { 90, 65, 0, 0, 0, 0 }, { 90, 65, 73, 0, 0, 0 }, { 90, 65, 78, 0, 0, 0 },
            { 90, 65, 78, 71, 0, 0 }, { 90, 65, 79, 0, 0, 0 }, { 90, 69, 0, 0, 0, 0 },
            { 90, 69, 73, 0, 0, 0 }, { 90, 69, 78, 0, 0, 0 }, { 90, 69, 78, 71, 0, 0 },
            { 90, 72, 65, 0, 0, 0 }, { 90, 72, 65, 73, 0, 0 }, { 90, 72, 65, 78, 0, 0 },
            { 90, 72, 65, 78, 71, 0 }, { 90, 72, 65, 79, 0, 0 }, { 90, 72, 69, 0, 0, 0 },
            { 90, 72, 69, 78, 0, 0 }, { 90, 72, 69, 78, 71, 0 }, { 90, 72, 73, 0, 0, 0 },
            { 90, 72, 79, 78, 71, 0 }, { 90, 72, 79, 85, 0, 0 }, { 90, 72, 85, 0, 0, 0 },
            { 90, 72, 85, 65, 0, 0 }, { 90, 72, 85, 65, 73, 0 }, { 90, 72, 85, 65, 78, 0 },
            { 90, 72, 85, 65, 78, 71 }, { 90, 72, 85, 73, 0, 0 }, { 90, 72, 85, 78, 0, 0 },
            { 90, 72, 85, 79, 0, 0 }, { 90, 73, 0, 0, 0, 0 }, { 90, 79, 78, 71, 0, 0 },
            { 90, 79, 85, 0, 0, 0 }, { 90, 85, 0, 0, 0, 0 }, { 90, 85, 65, 78, 0, 0 },
            { 90, 85, 73, 0, 0, 0 }, { 90, 85, 78, 0, 0, 0 }, { 90, 85, 79, 0, 0, 0 }, };

    /** First and last Chinese character with known Pinyin according to zh collation */
    private static final String FIRST_PINYIN_UNIHAN = "\u963F";
    private static final String LAST_PINYIN_UNIHAN = "\u84D9";
    /** The first Chinese character in Unicode block */
    private static final char FIRST_UNIHAN = '\u3400';
    private static final Collator COLLATOR = Collator.getInstance(Locale.CHINA);

    private static HanziToPinyin sInstance;
    private final boolean mHasChinaCollator;

    public static class Token {
        /**
         * Separator between target string for each source char
         */
        public static final String SEPARATOR = " ";

        public static final int LATIN = 1;
        public static final int PINYIN = 2;
        public static final int UNKNOWN = 3;

        public Token() {
        }

        public Token(int type, String source, String target) {
            this.type = type;
            this.source = source;
            this.target = target;
        }

        /**
         * Type of this token, ASCII, PINYIN or UNKNOWN.
         */
        public int type;
        /**
         * Original string before translation.
         */
        public String source;
        /**
         * Translated string of source. For Han, target is corresponding Pinyin. Otherwise target is
         * original string in source.
         */
        public String target;
    }

    protected HanziToPinyin(boolean hasChinaCollator) {
        mHasChinaCollator = hasChinaCollator;
    }

    public static HanziToPinyin getInstance() {
        synchronized (HanziToPinyin.class) {
            if (sInstance != null) {
                return sInstance;
            }
            // Check if zh_CN collation data is available
            final Locale locale[] = Collator.getAvailableLocales();
            for (int i = 0; i < locale.length; i++) {
                if (locale[i].equals(Locale.CHINA)) {
                    // Do self validation just once.
                    if (DEBUG) {
                        Log.d(TAG, "Self validation. Result: " + doSelfValidation());
                    }
                    sInstance = new HanziToPinyin(true);
                    return sInstance;
                }
            }
            Log.w(TAG, "There is no Chinese collator, HanziToPinyin is disabled");
            sInstance = new HanziToPinyin(false);
            return sInstance;
        }
    }

    /**
     * Validate if our internal table has some wrong value.
     *
     * @return true when the table looks correct.
     */
    private static boolean doSelfValidation() {
        char lastChar = UNIHANS[0];
        String lastString = Character.toString(lastChar);
        for (char c : UNIHANS) {
            if (lastChar == c) {
                continue;
            }
            final String curString = Character.toString(c);
            int cmp = COLLATOR.compare(lastString, curString);
            if (cmp >= 0) {
                Log.e(TAG, "Internal error in Unihan table. " + "The last string \"" + lastString
                        + "\" is greater than current string \"" + curString + "\".");
                return false;
            }
            lastString = curString;
        }
        return true;
    }

    private Token getToken(char character) {
        Token token = new Token();
        final String letter = Character.toString(character);
        token.source = letter;
        int offset = -1;
        int cmp;
        if (character < 256) {
            token.type = Token.LATIN;
            token.target = letter;
            return token;
        } else if (character < FIRST_UNIHAN) {
            token.type = Token.UNKNOWN;
            token.target = letter;
            return token;
        } else {
            cmp = COLLATOR.compare(letter, FIRST_PINYIN_UNIHAN);
            if (cmp < 0) {
                token.type = Token.UNKNOWN;
                token.target = letter;
                return token;
            } else if (cmp == 0) {
                token.type = Token.PINYIN;
                offset = 0;
            } else {
                cmp = COLLATOR.compare(letter, LAST_PINYIN_UNIHAN);
                if (cmp > 0) {
                    token.type = Token.UNKNOWN;
                    token.target = letter;
                    return token;
                } else if (cmp == 0) {
                    token.type = Token.PINYIN;
                    offset = UNIHANS.length - 1;
                }
            }
        }

        token.type = Token.PINYIN;
        if (offset < 0) {
            int begin = 0;
            int end = UNIHANS.length - 1;
            while (begin <= end) {
                offset = (begin + end) / 2;
                final String unihan = Character.toString(UNIHANS[offset]);
                cmp = COLLATOR.compare(letter, unihan);
                if (cmp == 0) {
                    break;
                } else if (cmp > 0) {
                    begin = offset + 1;
                } else {
                    end = offset - 1;
                }
            }
        }
        if (cmp < 0) {
            offset--;
        }
        StringBuilder pinyin = new StringBuilder();
        for (int j = 0; j < PINYINS[offset].length && PINYINS[offset][j] != 0; j++) {
            pinyin.append((char) PINYINS[offset][j]);
        }
        token.target = pinyin.toString();
        return token;
    }

    /**
     * Convert the input to a array of tokens. The sequence of ASCII or Unknown characters without
     * space will be put into a Token, One Hanzi character which has pinyin will be treated as a
     * Token. If these is no China collator, the empty token array is returned.
     */
    public ArrayList get(final String input) {
        ArrayList tokens = new ArrayList();
        if (!mHasChinaCollator || TextUtils.isEmpty(input)) {
            // return empty tokens.
            return tokens;
        }
        final int inputLength = input.length();
        final StringBuilder sb = new StringBuilder();
        int tokenType = Token.LATIN;
        // Go through the input, create a new token when
        // a. Token type changed
        // b. Get the Pinyin of current charater.
        // c. current character is space.
        for (int i = 0; i < inputLength; i++) {
            final char character = input.charAt(i);
            if (character == ' ') {
                if (sb.length() > 0) {
                    addToken(sb, tokens, tokenType);
                }
            } else if (character < 256) {
                if (tokenType != Token.LATIN && sb.length() > 0) {
                    addToken(sb, tokens, tokenType);
                }
                tokenType = Token.LATIN;
                sb.append(character);
            } else if (character < FIRST_UNIHAN) {
                if (tokenType != Token.UNKNOWN && sb.length() > 0) {
                    addToken(sb, tokens, tokenType);
                }
                tokenType = Token.UNKNOWN;
                sb.append(character);
            } else {
                Token t = getToken(character);
                if (t.type == Token.PINYIN) {
                    if (sb.length() > 0) {
                        addToken(sb, tokens, tokenType);
                    }
                    tokens.add(t);
                    tokenType = Token.PINYIN;
                } else {
                    if (tokenType != t.type && sb.length() > 0) {
                        addToken(sb, tokens, tokenType);
                    }
                    tokenType = t.type;
                    sb.append(character);
                }
            }
        }
        if (sb.length() > 0) {
            addToken(sb, tokens, tokenType);
        }
        return tokens;
    }

    private void addToken(
            final StringBuilder sb, final ArrayList tokens, final int tokenType) {
        String str = sb.toString();
        tokens.add(new Token(tokenType, str, str));
        sb.setLength(0);
    }
}