[移动开发]java简单播放器涉及与实现

详细设计

歌曲类

播放列表类

播放器类

实例代码如下

Song类

package com.entity;

import java.util.Objects;

public class Song {
    private String id;
    private String name;
    private String singer;

    @Override
    public String toString() {
        return "Song{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", singer='" + singer + '\'' +
                '}';
    }

    public Song(String id, String name, String singer) {
        this.id = id;
        this.name = name;
        this.singer = singer;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSinger() {
        return singer;
    }

    public void setSinger(String singer) {
        this.singer = singer;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Song song = (Song) o;
        return Objects.equals(id, song.id) &&
                Objects.equals(name, song.name) &&
                Objects.equals(singer, song.singer);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, name, singer);
    }
}

歌单列表类

package com.entity;

import java.util.ArrayList;
import java.util.List;

public class PlayList {
    private String playListName;
    private List<Song> musicList;//用于存储歌曲

    public PlayList(String playListName) {
        this.playListName = playListName;
        musicList = new ArrayList<Song>();
    }
    public Song searchSongById(String id){
        Song song=null;
        for (Song song1 : musicList) {
            if(song1.getId().equals(id)){
                song = song1;break;
            }
        }
        return song;
    }
    public Song searchSongByName(String name){
        Song song=null;
        for (Song song1 : musicList) {
            if(song1.getName().equals(name)){
                song = song1;break;
            }
        }
        return song;
    }
    public void addToPlayList(Song song){
        boolean flag=false;
        //判断歌单中是否有重复的歌曲
        for(Song song1:musicList){
            if(song1.equals(song)){
                flag=true;
                break;
            }
        }
        if(flag){
            System.out.println("歌单中已经存在该歌曲，存储失败！");
        }else{
            musicList.add(song);
        }
    }
    public void updateSong(String id,Song song){
        Song song1 = searchSongById(id);
        if(song1!=null){
            musicList.remove(song1);
            musicList.add(song);
            System.out.println("更新成功！");
        }else{
            System.out.println("未找到该歌曲");
        }
    }
    public void deleteSong(String id){
        Song song1 = searchSongById(id);
        if(song1!=null){
            musicList.remove(song1);
        }else{
            System.out.println("列表中没有这首歌，删除失败！");
        }
    }
    public void displayAllSong(){
        for (Song song:musicList){
            System.out.println(song);
        }
    }

    public String getPlayListName() {
        return playListName;
    }

    public void setPlayListName(String playListName) {
        this.playListName = playListName;
    }

    public List<Song> getMusicList() {
        return musicList;
    }

    public void setMusicList(List<Song> musicList) {
        this.musicList = musicList;
    }
}

歌单集合类

package com.entity;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

public class PlayListCollection {
    private Map<String,PlayList> PlayListMap;

    public Map<String, PlayList> getPlayListMap() {
        return PlayListMap;
    }

    public void setPlayListMap(Map<String, PlayList> playListMap) {
        PlayListMap = playListMap;
    }
//实现构造方法
    public PlayListCollection(){
        PlayListMap = new HashMap<String,PlayList>();
    }
    //实现增加方法
    public void addPlayList(PlayList playList){
            PlayListMap.put(playList.getPlayListName(),playList);
    }
    //实现通过名字进行搜索播放列表功能
    public PlayList searchPlayListByName(String playListName){
        PlayList playList=null;
        Set<String> set = PlayListMap.keySet();
        for (String s : set) {
            if(s.equals(playListName)){
                playList=PlayListMap.get(s);break;
            }
        }
        return playList;
    }
    //实现展示所有播放列表的功能
    public void displayListName(){
        PlayList playList=null;
        Set<String> strings = PlayListMap.keySet();
        for (String string : strings) {
            playList=PlayListMap.get(string);
            System.out.println(playList.getPlayListName());
        }
    }
    //实现删除播放列表
    public void deletePlayList(PlayList playList){
        PlayListMap.remove(playList.getPlayListName());
    }
}

主函数和测试类

package com.test;

import com.entity.PlayList;
import com.entity.PlayListCollection;
import com.entity.Song;

import java.util.Scanner;

public class TestDemo {
    public void SongTest(){
        Song s1 = new Song("s001", "十七岁", "刘德华");
        Song s2 = new Song("s002", "七里香", "周杰伦");
        Song s3 = new Song("s003", "江南", "林俊杰");
        Song s4 = new Song("s004", "春天里", "汪峰 ");
        System.out.println(s1);
        System.out.println(s1.equals(s2));
        System.out.println(s3.equals(s4));
    }
    public void PlayListTest(){
        Song s1 = new Song("s001", "十七岁", "刘德华");
        Song s2 = new Song("s002", "七里香", "周杰伦");
        Song s3 = new Song("s003", "江南", "林俊杰");
        Song s4 = new Song("s004", "春天里", "汪峰 ");
        PlayList mainPlayList = new PlayList("歌曲主菜单");
        mainPlayList.addToPlayList(s1);
        mainPlayList.addToPlayList(s2);
        mainPlayList.addToPlayList(s3);
        mainPlayList.addToPlayList(s3);
        mainPlayList.displayAllSong();
        Song song=null;
//        song=mainPlayList.searchSongById("s002");
//        if(song!=null){
//            System.out.println("根据id找寻的歌曲为:");
//            System.out.println(song);
//        }else{
//            System.out.println("未找到该歌曲");
//        }
//        song =mainPlayList.searchSongByName("七里香");
//        if(song!=null){
//            System.out.println("根据歌曲名找到歌曲为:");
//            System.out.println(song);
//        }else{
//            System.out.println("未找到该歌曲");
//        }
        Song songNew = new Song("s006","怒放的生命","小汪");
        mainPlayList.updateSong("s002",songNew);
        mainPlayList.displayAllSong();
        mainPlayList.deleteSong("s001");
        System.out.println("删除后歌单中的歌曲");
        mainPlayList.displayAllSong();
    }
    public void PlayListCollectionTest(){
        Song s1 = new Song("s001", "十七岁", "刘德华");
        Song s2 = new Song("s002", "七里香", "周杰伦");
        Song s3 = new Song("s003", "江南", "林俊杰");
        PlayList mainPlayList = new PlayList("主播放列表");
        mainPlayList.addToPlayList(s1);
        mainPlayList.addToPlayList(s2);
        mainPlayList.addToPlayList(s3);
        PlayList favoritePlayList = new PlayList("最喜爱的音乐");
        favoritePlayList.addToPlayList(mainPlayList.getMusicList().get(0));
        favoritePlayList.addToPlayList(mainPlayList.getMusicList().get(1));
        favoritePlayList.displayAllSong();
        //将播放列表添加到播放列表集合中,并展示
        PlayListCollection playListCollection = new PlayListCollection();
        playListCollection.addPlayList(mainPlayList);
        playListCollection.addPlayList(favoritePlayList);
        playListCollection.displayListName();
        //实现通过搜索获取歌单的歌曲
        System.out.println("-----实现通过搜索获取歌单的歌曲--------");
        PlayList list1 = playListCollection.searchPlayListByName("主播放列表");
        list1.displayAllSong();
        //删除歌单
        System.out.println("原来有歌单为:");
        playListCollection.displayListName();
        System.out.println("-----实现删除歌单功能,并进行打印--------");
        playListCollection.deletePlayList(mainPlayList);

        playListCollection.displayListName();
    }
    //主菜单
    public void mainMenu(){
        System.out.println("********************************");
        System.out.println("          **主菜单**            ");
        System.out.println("          1--播放列表管理");
        System.out.println("          2--播放器管理");
        System.out.println("          0--退出");
        System.out.println("********************************");
    }
    public void playListMenu(){
        System.out.println("************************************************");
        System.out.println("           **播放歌曲管理");
        System.out.println("           1--将歌曲添加到主播放列表");
        System.out.println("           2--将歌曲添加到普通播放列表");
        System.out.println("           3--通过歌曲id查询播放列表中的歌曲");
        System.out.println("           4--通过歌曲名称查询播放列表中的歌曲");
        System.out.println("           5--修改播放列表中的歌曲");
        System.out.println("           6--删除播放列表中的歌曲");
        System.out.println("           7--显示播放列表中的所有歌曲");
        System.out.println("           9--返回上一级菜单");
        System.out.println("************************************************");

    }
    //播放器菜单

    public void playerMenu(){
        System.out.println("************************************************");
        System.out.println("           **播放列表管理");
        System.out.println("           1--向播放器添加播放列表");
        System.out.println("           2--从播放器删除播放列表");
        System.out.println("           3--通过名字查询播放列表信息");
        System.out.println("           4--显示所有播放列表名称");
        System.out.println("           9--返回上一级菜单");
        System.out.println("************************************************");

    }
    public void test(){
        TestDemo td = new TestDemo();
        Scanner sc = new Scanner(System.in);
        int input=0,input1=0,input2=0;
        PlayListCollection playListCollection = new PlayListCollection();
        PlayList mainPlayList = new PlayList("主播放歌单");
        playListCollection.addPlayList(mainPlayList);
        PlayList favoritePlayList = null;
        while(true){
            td.mainMenu();
            System.out.println("请输入对应数字进行操作");
            input=sc.nextInt();
            if(input==0){
                System.out.println("           **退出系统**");
                break;
            }
            switch (input){
                case 1:
                    while (true){
                        playListMenu();
                        System.out.println("请输入对应数字进行操作");
                        input1=sc.nextInt();
                        if (input1==9){
                            break;
                        }
                        switch (input1){
                            case 1:
                                System.out.println("请输入要添加歌曲的数量");
                                int count=sc.nextInt();
                                for (int i = 0; i <count ; i++) {
                                    System.out.println("请输入歌曲的id");
                                    String strId = sc.next();
                                    System.out.println("请输入歌曲的名字");
                                    String strName=sc.next();
                                    System.out.println("请输入作者的名字");
                                    String strWriter = sc.next();
                                    mainPlayList.addToPlayList(new Song(strId,strName,strWriter));
                                    mainPlayList.displayAllSong();
                                }
                                break;
                            case 2:
                                System.out.println("请输入要添加歌曲到的播放列表名字:");
                                String strPlayListCollection = sc.next();
                                favoritePlayList = playListCollection.searchPlayListByName(strPlayListCollection);
                                if(favoritePlayList==null){
                                    System.out.println("该播放列表不存在，请先将播放列表添加到播放器中");
                                }else{
                                    System.out.println("请输入要添加的歌曲数量:");
                                    int count2=sc.nextInt();
                                    for (int i=1;i<=count2;i++){
                                        System.out.println("请输入第"+i+"首歌");
                                        System.out.println("请输入id");
                                        String strId =sc.next();
                                        Song song = mainPlayList.searchSongById(strId);
                                        if(song==null){
                                            System.out.println("该歌曲在主播放列表中不存在，请输入歌曲其他信息");
                                            System.out.println("请输入歌曲名称：");
                                            String strName=sc.next();
                                            System.out.println("请输入歌曲作者");
                                            String songer = sc.next();
                                            song = new Song(strId, strName, songer);
                                            favoritePlayList.addToPlayList(song);
                                            mainPlayList.addToPlayList(song);
                                        }else{
                                            //如果歌曲存在于主播放列表中，则直接通过搜索加入到
                                            favoritePlayList.addToPlayList(song);
                                        }
                                    }
                                    System.out.println("主播放列表");
                                    mainPlayList.displayAllSong();
                                    System.out.println("普通播放列表");
                                    favoritePlayList.displayAllSong();

                                }
                                break;
                            case 3:
                                System.out.println("请输入要查询的播放列表名称");
                                String strPlayListName =sc.next();
                                PlayList pl = playListCollection.searchPlayListByName(strPlayListName);
                                if(pl==null){
                                    System.out.println("该播放列表不存在");break;
                                }else{
                                    System.out.println("请输入要查询歌曲id");
                                    String strId =sc.next();
                                    Song song = pl.searchSongById(strId);
                                    System.out.println("通过id查找到歌曲为:");
                                    System.out.println(song);
                                }
                                break;
                            case 4:
                                System.out.println("请输入要查询的播放列表名称");
                                String strPlayListName2 =sc.next();
                                PlayList pl2 = playListCollection.searchPlayListByName(strPlayListName2);
                                if(pl2==null){
                                    System.out.println("该播放列表不存在");break;
                                }else{
                                    System.out.println("请输入歌曲名称");
                                    String strName =sc.next();
                                    Song song1 = mainPlayList.searchSongByName(strName);
                                    System.out.println("通过歌曲名字查找到歌曲为:");
                                    System.out.println(song1);
                                }
                                break;
                            case 5:
                                System.out.println("请输入要修改的播放歌曲列表");
                                String strPlayListName3 =sc.next();
                                PlayList pl3 = playListCollection.searchPlayListByName(strPlayListName3);
                                if(pl3==null){
                                    System.out.println("该播放列表不存在");
                                }else{
                                    System.out.println("请输入要修改播放歌曲的id");
                                    String strId = sc.next();
                                    System.out.println("请输入修改后的歌曲信息");
                                    System.out.println("请输入ID");
                                    String strId2 =sc.next();
                                    System.out.println("请输入歌曲名称：");
                                    String strName=sc.next();
                                    System.out.println("请输入歌曲作者");
                                    String songer = sc.next();
                                    Song song = new Song(strId2, strName, songer);
                                    pl3.updateSong(strId,song);
                                }
                                break;
                            case 6:
                                System.out.println("请输入要删除歌曲所在的播放歌曲列表");
                                String strPlayListName4 =sc.next();
                                PlayList pl4 = playListCollection.searchPlayListByName(strPlayListName4);
                                if(pl4==null){
                                    System.out.println("该播放列表不存在");
                                }else{
                                System.out.println("请输入要删除歌曲的id");
                                String strId =sc.next();
                                pl4.deleteSong(strId);
                                }
                            case 7:mainPlayList.displayAllSong();break;

                        }
                    }
                    break;
                case 2:
                    //进行播放器管理
                    while (true){
                        td.playerMenu();
                        System.out.println("请输入数字进行对应操作");
                        input2=sc.nextInt();
                        if (input2==9){
                            break;
                        }
                        switch (input2){
                            case 1:
                                System.out.println("请输入要添加的播放列表的名称");
                                String strName=sc.next();
                                favoritePlayList = new PlayList(strName);
                                playListCollection.addPlayList(favoritePlayList);
                                System.out.println("添加成功");
                                break;
                            case 2:
                                System.out.println("请输入要删除的播放列表名称");
                                String strName2=sc.next();
                                PlayList playList = playListCollection.searchPlayListByName(strName2);
                                if(strName2=="主播放器列表"){
                                    System.out.println("主播放器列表不能删除，请重新选择");
                                }else{
                                    if(playList==null){
                                        System.out.println("未找到该歌曲");
                                    }else{
                                        playListCollection.deletePlayList(playList);
                                        System.out.println("删除成功");
                                    }

                                }
                                break;
                            case 3:
                                System.out.println("请输入要查询列表名称");
                                String strName3 =sc.next();
                                PlayList playList1 = playListCollection.searchPlayListByName(strName3);
                                if(playList1==null){
                                    System.out.println("未找到该歌曲列表");
                                }else{
                                    System.out.println("该播放列表中的歌曲有");
                                    playList1.displayAllSong();
                                }
                                break;
                            case 4:playListCollection.displayListName();
                        }
                    }

                    break;
                default:
                    System.out.println("该数字没有对应的操作");
                    break;
            }
        }
    }
    public static void main(String[] args) {
        TestDemo testDemo = new TestDemo();
        testDemo.test();
//        testDemo.SongTest();
//        testDemo.PlayListTest();
//        testDemo.PlayListCollectionTest();

    }
}

注意：
这里需要注意 在使用列表类构造方法时，可以直接通过构造方法实现里面集合的创建

 public PlayListCollection(){
        PlayListMap = new HashMap<String,PlayList>();
    }