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我直接进入调试的,没表达清楚,就是isLetter1=false isLetter2=true时,不进行第三个if判断,然后直接跳到最后一个return了。
在别人的编译器环境里调试也是这样的,要不我把代码给你,你试试。但是第一次进入Comparator时,四个判断都会运行,而第二次进入,就不会走四个判断,直接跳到最后一个。
不行啊,compare方法都是在main线程里面。
http://blog.csdn.net/windsunmoon/article/details/39163023
里面很详细
但是比较的时候,有个if就是不进去。
但是比较的时候,有个if就是不进去。
那是因为你的代码逻辑有问题。
但是比较的时候,有个if就是不进去。
那是因为你的代码逻辑有问题。
是有问题才发上来嘛! if(true)进不去是不是太诡异了?
难道compareTo会涉及到多线程?调试发现只是在mainThread里面调用的。
但是比较的时候,有个if就是不进去。
那是因为你的代码逻辑有问题。
是有问题才发上来嘛! if(true)进不去是不是太诡异了?
难道compareTo会涉及到多线程?调试发现只是在mainThread里面调用的。
你可以把完整的代码发上来看看。
现在没有Song的代码,也不知道你传递给compare的两个对象的值是什么,所以没有办法做进一步的分析。
package com.huwei.sweetmusicplayer.comparator;import java.util.Comparator;import com.huwei.sweetmusicplayer.models.Song;
import com.huwei.sweetmusicplayer.util.CharacterParser;
public class SongComparator implements Comparator<Song> { @Override
public int compare(Song song1, Song song2) {
// TODO Auto-generated method stub
// boolean isLetter1;
// boolean isLetter2;
// 得到歌曲名 String title1 ;
String title2 ;
int isLetter1_m ;
int isLetter2_m ;
boolean isLetter1 ;
boolean isLetter2 ;
title1 = song1.getTitle();
title2 = song2.getTitle(); if (title1.equals("bg_reloj") || title2.equals("bg_reloj")) {
System.out.println();
} isLetter1_m = CharacterParser.firstIsLetter(title1);
isLetter2_m = CharacterParser.firstIsLetter(title2);// isLetter1 = (isLetter1_m == 0) ? false:true;
// isLetter2 = (isLetter2_m == 0) ? false:true;
if(isLetter1_m!=0){
isLetter1=true;
}else {
isLetter1=false;
}
if(isLetter2_m!=0){
isLetter2=true;
}else {
isLetter2=false;
} // isLetter1=true;
// isLetter2=false;
if (isLetter1 && isLetter2) {
// 第一个是小写,第二个是大写
if (isLetter1_m < isLetter2_m) {
return -1;
}// 第一个是大写,第一个是小写
else if (isLetter1_m > isLetter2_m) {
return 1;
}// 大小写情况相同
else {
return CharacterParser.getFirstLetter(title1).charAt(0)
- CharacterParser.getFirstLetter(title2).charAt(0);
}
} else if (isLetter1) {
return -1;
} else if (isLetter2) {
return 1;
} else {
return CharacterParser.getFirstLetter(title1).charAt(0)
- CharacterParser.getFirstLetter(title2).charAt(0);
}
}}
Song.java
package com.huwei.sweetmusicplayer.models;import java.io.Serializable;import com.huwei.sweetmusicplayer.util.CharacterParser;
import com.huwei.sweetmusicplayer.util.TimeUtil;public class Song implements Serializable{
private String title; //歌曲名
private int duration; //时长
private String artist; //艺术家
private int id; //id
private String display_name;
private String data;
private String date_added;
private String path;
private String sortLetters; //检索的首字母
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public String getDisplay_name() {
return display_name;
} public void setDisplay_name(String display_name) {
this.display_name = display_name;
} public String getData() {
return data;
} public void setData(String data) {
this.data = data;
}
public String getDate_added() {
return date_added;
} public void setDate_added(String date_added) {
this.date_added = date_added;
} public Song(){
}
public Song(String title){
super();
this.title=title;
if(title.equals("安居客"))
{
System.out.println();
}
String firstLetter=CharacterParser.getFirstLetter(title);
//正则匹配 ,匹配大小写字母
if(firstLetter.matches("^[a-zA-Z]$")){
this.sortLetters=firstLetter.toUpperCase();
}else{
this.sortLetters="#";
}
}
public Song(String title, String sortLetters) {
super();
this.title = title;
this.sortLetters = sortLetters;
}
public String getTitle() {
return title;
} public void setTitle(String title) {
this.title = title;
} public String getSortLetters() {
return CharacterParser.getFirstUpperLetter(title);
}
public void setSortLetters(String sortLetters) {
this.sortLetters = sortLetters;
} public String getDurationTime(){
return TimeUtil.toTime(duration);
} public int getDuration() {
return duration;
} public void setDuration(int duration) {
this.duration = duration;
} public String getArtist() {
return artist;
} public void setArtist(String artist) {
this.artist = artist;
} public String getPath() {
return path;
} public void setPath(String path) {
this.path = path;
}
}
package com.huwei.sweetmusicplayer.util;import java.io.UnsupportedEncodingException;
/*
* java汉字转拼音*/
public class CharacterParser {
//private static LinkedHashMap<String, Integer> spellMap;;
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 static CharacterParser instance;
private StringBuilder resource;
//单例模式
public CharacterParser getInstance(){
if(instance==null) {
instance=new CharacterParser();
}
return instance;
}
public StringBuilder getResource() {
return resource;
}
public void setResource(StringBuilder resource) {
this.resource = resource;
}
//单个汉字转成ansi
public static int getChsAscii(String chs){
int asc=0;
try {
byte[] bytes=chs.getBytes("gb2312");
if(bytes==null||bytes.length==0){
throw new RuntimeException("illegal resource string");
}
if(bytes.length==1){ //英文字符
asc=bytes[0];
}
if(bytes.length==2){ //中文字符
int highByte=256+bytes[0];
int lowByte=256+bytes[1];
asc=(256*highByte+lowByte)-256*256;
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return asc;
}
//首字符是否是字母
//大写return 1 小写return -1 非retrun 0
public static int firstIsLetter(String name){
int asc=getChsAscii(name.substring(0,1));
if( asc>='A'&&asc<='Z'){//单字符
return 1;
}else if(asc>='a'&&asc<='z'){
return -1;
}else{
return 0;
}
}
//提取首字母,大小写均可
public static String getSpellByAscii(int asc){
String res=null;
if(asc>0&&asc<160){//单字符
res=String.valueOf((char)asc);
}
else if (asc< -20319 || asc > -10247) { //未知字符
return null;
}
else {
for(int i=pyvalue.length-1;i>=0;i--){
if(asc>=pyvalue[i]){
res=pystr[i];
break;
}
}
}
//提取首字母
res=res.substring(0,1);
return res;
}
//获取首字母的大写字母
public static String getFirstUpperLetter(String cn){
return getFirstLetter(cn).toUpperCase();
}
//获取首字母
public static String getFirstLetter(String cn){
return getSpellByAscii(getChsAscii(cn.substring(0, 1)));
}
//获取全拼
public static String getFullSpell(String cn){
String resString=null;
for(int i=0;i<cn.length();i++){
String string=cn.substring(i, i+1);
resString+=getSpellByAscii(getChsAscii(string));
}
return resString;
}}
然后就调用了ListView排序的方法。现在的问题就是英文排不到中文前面去,调试发现有个if进不去。
但是比较的时候,有个if就是不进去。
那是因为你的代码逻辑有问题。
是有问题才发上来嘛! if(true)进不去是不是太诡异了?
难道compareTo会涉及到多线程?调试发现只是在mainThread里面调用的。
你可以把完整的代码发上来看看。
现在没有Song的代码,也不知道你传递给compare的两个对象的值是什么,所以没有办法做进一步的分析。
代码在18,19楼,如果觉得还是看不清,我就把代码弄个链接吧。
如果你把if (isLetter1)分支语句多写几句再调试一下就看得更清楚了:else if (isLetter1) {
int result = 1; // 这里下调试断点
result *= -1;
return result;
} else if (isLetter2) {为什么会这么奇怪呢,我猜测是因为函数编译出来其实只有一个return,并把最后一个return作为真正执行return的语句,所以无论如何都会跳到最后一个return,但函数计算结果是正确的。