一、读取本地文件

权限：

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

二、MusicDemo实现

我们大致想要的效果（目前未美化）：

分析：
1、封装类： 为了更好的管理我们的文件，我们需要单独建立一个类来管理MP3文件的属性值，新建类命名为MusicInfo.java
2、读取： 再新建一个类查询数据库取得MP3文件，并分离取得各属性值，MusicUtil.java
3、美化： 新建list.xml用适配器MusicListAdapter.java将读取内容存放于列表形式显示
4、显示：

总项目结构：

三、具体实现类

1、MusicInfo：

package com.example.cungu.musicdemo;//为了更好的管理我们的文件，我们需要单独建立一个类来管理MP3文件的属性值，新建类命名为MusicInfo.java:public class MusicInfo {    private long id; // 歌曲ID    private String title; // 歌曲名称    private String album; // 专辑    private long albumId;//专辑ID    private String displayName; //显示名称    private String artist; // 歌手名称    private long duration; // 歌曲时长    private long size; // 歌曲大小    private String url; // 歌曲路径    private String lrcTitle; // 歌词名称    private String lrcSize; // 歌词大小    public MusicInfo() {        super();    }    public MusicInfo(long id, String title, String album, long albumId,                     String displayName, String artist, long duration, long size,                     String url, String lrcTitle, String lrcSize) {        super();        this.id = id;        this.title = title;        this.album = album;        this.albumId = albumId;        this.displayName = displayName;        this.artist = artist;        this.duration = duration;        this.size = size;        this.url = url;        this.lrcTitle = lrcTitle;        this.lrcSize = lrcSize;    }    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getAlbum() {        return album;    }    public void setAlbum(String album) {        this.album = album;    }    public long getAlbumId() {        return albumId;    }    public void setAlbumId(long albumId) {        this.albumId = albumId;    }    public String getArtist() {        return artist;    }    public void setArtist(String artist) {        this.artist = artist;    }    public long getDuration() {        return duration;    }    public void setDuration(long duration) {        this.duration = duration;    }    public long getSize() {        return size;    }    public void setSize(long size) {        this.size = size;    }    public String getUrl() {        return url;    }    public void setUrl(String url) {        this.url = url;    }    public String getLrcTitle() {        return lrcTitle;    }    public void setLrcTitle(String lrcTitle) {        this.lrcTitle = lrcTitle;    }    public String getLrcSize() {        return lrcSize;    }    public void setLrcSize(String lrcSize) {        this.lrcSize = lrcSize;    }    public String getDisplayName() {        return displayName;    }    public void setDisplayName(String displayName) {        this.displayName = displayName;    }}

2、MusicUtil

package com.example.cungu.musicdemo;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import android.content.Context;import android.database.Cursor;import android.provider.MediaStore;//再新建一个类查询数据库取得MP3文件，并分离取得各属性值，MusicUtil.java：public class MusicUtil {    public static List<MusicInfo> getMp3Infos(Context context) {        Cursor cursor = context.getContentResolver().query(                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,                MediaStore.Audio.Media.DEFAULT_SORT_ORDER);        List<MusicInfo> musicInfos = new ArrayList<MusicInfo>();        for (int i = 0; i < cursor.getCount(); i++) {            cursor.moveToNext();            MusicInfo musicInfo = new MusicInfo();            long id = cursor.getLong(cursor                    .getColumnIndex(MediaStore.Audio.Media._ID));//音乐id            String title = cursor.getString((cursor                    .getColumnIndex(MediaStore.Audio.Media.TITLE))); // 音乐标题            String artist = cursor.getString(cursor                    .getColumnIndex(MediaStore.Audio.Media.ARTIST)); // 艺术家            String album = cursor.getString(cursor                    .getColumnIndex(MediaStore.Audio.Media.ALBUM));//专辑            String displayName = cursor.getString(cursor                    .getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));            long albumId = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));            long duration = cursor.getLong(cursor                    .getColumnIndex(MediaStore.Audio.Media.DURATION)); // 时长            long size = cursor.getLong(cursor                    .getColumnIndex(MediaStore.Audio.Media.SIZE)); // 文件大小            String url = cursor.getString(cursor                    .getColumnIndex(MediaStore.Audio.Media.DATA)); // 文件路径            int isMusic = cursor.getInt(cursor                    .getColumnIndex(MediaStore.Audio.Media.IS_MUSIC)); // 是否为音乐            if (isMusic != 0) { // 只把音乐添加到集合当中                musicInfo.setId(id);                musicInfo.setTitle(title);                musicInfo.setArtist(artist);                musicInfo.setAlbum(album);                musicInfo.setDisplayName(displayName);                musicInfo.setAlbumId(albumId);                musicInfo.setDuration(duration);                musicInfo.setSize(size);                musicInfo.setUrl(url);                musicInfos.add(musicInfo);            }        }        return musicInfos;    }    public static List<HashMap<String, String>> getMusicMaps(            List<MusicInfo> mp3Infos) {        List<HashMap<String, String>> mp3list = new ArrayList<HashMap<String, String>>();        for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {            MusicInfo musicInfo = (MusicInfo) iterator.next();            HashMap<String, String> map = new HashMap<String, String>();            map.put("title", musicInfo.getTitle());            map.put("Artist", musicInfo.getArtist());            map.put("album", musicInfo.getAlbum());            map.put("displayName", musicInfo.getDisplayName());            map.put("albumId", String.valueOf(musicInfo.getAlbumId()));            map.put("duration", formatTime(musicInfo.getDuration()));            map.put("size", String.valueOf(musicInfo.getSize()));            map.put("url", musicInfo.getUrl());            mp3list.add(map);        }        return mp3list;    }    /**     * 格式化时间，将毫秒转换为分:秒格式     * @param time     * @return     */    public static String formatTime(long time) {        // TODO Auto-generated method stub        String min = time / (1000 * 60) + "";        String sec = time % (1000 * 60) + "";        if (min.length() < 2) {            min = "0" + time / (1000 * 60) + "";        } else {            min = time / (1000 * 60) + "";        }        if (sec.length() == 4) {            sec = "0" + (time % (1000 * 60)) + "";        } else if (sec.length() == 3) {            sec = "00" + (time % (1000 * 60)) + "";        } else if (sec.length() == 2) {            sec = "000" + (time % (1000 * 60)) + "";        } else if (sec.length() == 1) {            sec = "0000" + (time % (1000 * 60)) + "";        }        return min + ":" + sec.trim().substring(0, 2);    }}

3、MusicListAdapter：

package com.example.cungu.musicdemo;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.ImageView;import android.widget.TextView;public class MusicListAdapter extends BaseAdapter{    private Context context;    private List<MusicInfo> musicInfos;    private MusicInfo musicInfo;    /**     * 构造函数     * @param context上下文     * @param mp3Infos  集合对象     */    public MusicListAdapter(Context context, List<MusicInfo> mp3Infos) {        this.context = context;        this.musicInfos = mp3Infos;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return musicInfos.size();    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return null;    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder = null;        if(convertView == null)        {            viewHolder = new ViewHolder();            convertView = LayoutInflater.from(context).inflate(R.layout.list, null);            viewHolder.musicTitle = (TextView) convertView.findViewById(R.id.name);            viewHolder.musicDuration = (TextView) convertView.findViewById(R.id.time);            viewHolder.musicArtist = (TextView) convertView.findViewById(R.id.actor);            convertView.setTag(viewHolder);//表示给View添加一个格外的数据，        } else {            viewHolder = (ViewHolder)convertView.getTag();//通过getTag的方法将数据取出来        }        musicInfo = musicInfos.get(position);        viewHolder.musicTitle.setText(musicInfo.getTitle());//显示标题        viewHolder.musicArtist.setText(musicInfo.getArtist());//显示艺术家        viewHolder.musicDuration.setText(MusicUtil.formatTime(musicInfo.getDuration()));//显示时长        return convertView;    }    /**     * 定义一个内部类     * 声明相应的控件引用     *     */    public class ViewHolder {        //所有控件对象引用        public ImageView albumImage;//专辑图片        public TextView musicTitle;//音乐标题        public TextView musicDuration;//音乐时长        public TextView musicArtist;//音乐艺术家    }}

4、list.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/time"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/actor"        android:layout_alignBottom="@+id/actor"        android:layout_alignParentRight="true"        android:layout_marginRight="28dp"        android:text="time"        android:textColor="#ffffff"/>    <TextView        android:id="@+id/name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginTop="2dp"        android:layout_marginLeft="24dp"        android:text="name"        android:textColor="#ffffff"        android:textSize="18sp" />    <TextView        android:id="@+id/actor"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/name"        android:layout_below="@+id/name"        android:textColor="#ffffff"        android:text="actor"        android:textSize="12sp"/>RelativeLayout>

5、activity_player_list.xml主界面：

<?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="match_parent"    android:orientation="vertical"    android:background="@drawable/music_play_background">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="40dp"        android:layout_marginTop="25dp"        android:orientation="horizontal">        <ImageButton            android:id="@+id/btn_MusicList2"            android:layout_width="35dp"            android:layout_height="35dp"            android:layout_gravity="center_vertical"            android:background="?attr/actionModeCloseDrawable"            android:backgroundTint="#ccffffff" />        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="20dp"            android:text="音乐列表"            android:layout_gravity="center_vertical"            android:textColor="#ffffff"            android:textSize="20sp" />    LinearLayout>    <TextView        android:layout_width="match_parent"        android:layout_height="0.5dp"        android:background="#afafaf"        android:layout_below="@+id/title"/>    <ListView        android:id="@+id/list"        android:layout_width="wrap_content"        android:layout_height="wrap_content" >    ListView>LinearLayout>

PlayerListActivity.java:

package com.example.cungu.musicdemo;import android.app.Activity;import java.io.Serializable;import java.util.List;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ListView;import android.widget.Toast;public class PlayerListActivity extends Activity implements AdapterView.OnItemLongClickListener {    private ListView listview;    private List<MusicInfo> musicInfos = null;    private MusicListAdapter Listadapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_player_list);        listview = (ListView) findViewById(R.id.list);        musicInfos = MusicUtil.getMp3Infos(PlayerListActivity.this);        Listadapter = new MusicListAdapter(this, musicInfos);        listview.setAdapter(Listadapter);        listview.setOnItemLongClickListener(this);    }    @Override    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {        Intent intent=new Intent();        intent.putExtra("music", (Serializable) musicInfos);        intent.setClass(this, MainActivity.class);        startActivity(intent);        return false;    }}

待解决问题：
如何把用适配器里的内容传给播放界面，播放！

【Android】_音乐列表_仿网易云音乐播放器2(读取本地mp3)

目录

一、读取本地文件

二、MusicDemo实现

三、具体实现类

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