android音乐播放器(Service+ContentProvider+Broadcast+Activity四大组件完成)

1、获取音乐

　　1-1：获取手机中的音乐（用ContentProvider内容提供者来完成）：

 1 package com.firefly.util;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashMap;
 5 import java.util.Iterator;
 6 import java.util.List;
 7 
 8 import android.content.Context;
 9 import android.database.Cursor;
10 import android.provider.MediaStore;
11 import android.util.Log;
12 
13 public class MediaUtil {
14     /**
15      * 用于从数据库中查询歌曲的信息，保存在List当中
16      * 
17      * @return
18      */
19     public static List<Mp3Info> getMp3Infos(Context context) {
20         Cursor cursor = context.getContentResolver().query(
21                 MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
22                 MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
23         List<Mp3Info> mp3Infos = new ArrayList<Mp3Info>();
24 
25         for (int i = 0; i < cursor.getCount(); i++) {
26             cursor.moveToNext();
27             Mp3Info mp3Info = new Mp3Info();
28             long id = cursor.getLong(cursor
29                     .getColumnIndex(MediaStore.Audio.Media._ID)); // 音乐id
30             String title = cursor.getString((cursor
31                     .getColumnIndex(MediaStore.Audio.Media.TITLE))); // 音乐标题
32             String artist = cursor.getString(cursor
33                     .getColumnIndex(MediaStore.Audio.Media.ARTIST)); // 艺术家
34             long duration = cursor.getLong(cursor
35                     .getColumnIndex(MediaStore.Audio.Media.DURATION)); // 时长
36             long size = cursor.getLong(cursor
37                     .getColumnIndex(MediaStore.Audio.Media.SIZE)); // 文件大小
38             String url = cursor.getString(cursor
39                     .getColumnIndex(MediaStore.Audio.Media.DATA)); // 文件路径
40             int isMusic = cursor.getInt(cursor
41                     .getColumnIndex(MediaStore.Audio.Media.IS_MUSIC)); // 是否为音乐
42             if (isMusic != 0) { // 只把音乐添加到集合当中
43 
44                 mp3Info.setId(id);
45                 mp3Info.setTitle(title);
46                 mp3Info.setArtist(artist);
47                 mp3Info.setDuration(duration);
48                 mp3Info.setSize(size);
49                 mp3Info.setUrl(url);
50 
51                 mp3Infos.add(mp3Info);
52             }
53         }
54         return mp3Infos;
55     }
56 
57     /**
58      * 格式化时间，将毫秒转换为分:秒格式
59      * 
60      * @param time
61      * @return
62      */
63     public static String formatTime(long time) {
64         String min = time / (1000 * 60) + "";
65         String sec = time % (1000 * 60) + "";
66         if (min.length() < 2) {
67             min = "0" + time / (1000 * 60) + "";
68         } else {
69             min = time / (1000 * 60) + "";
70         }
71         if (sec.length() == 4) {
72             sec = "0" + (time % (1000 * 60)) + "";
73         } else if (sec.length() == 3) {
74             sec = "00" + (time % (1000 * 60)) + "";
75         } else if (sec.length() == 2) {
76             sec = "000" + (time % (1000 * 60)) + "";
77         } else if (sec.length() == 1) {
78             sec = "0000" + (time % (1000 * 60)) + "";
79         }
80         return min + ":" + sec.trim().substring(0, 2);
81     }
82 }

MediaUtil