今天使用java写了一个简单的android播放器，感觉还不错，就是向更加的完善一点上网搜索了一下获取音乐对象的属性，比如，作者，专辑，时间的大小。看到一个比较好的例子，贴出来给大家分享。

public class Mp3 {

private SongInfo info = null;

private RandomAccessFile ran = null;

private File file = null;

public Mp3() throws FileNotFoundException {

file = new File("../MP3/music2/7 Years And 50 Days.mp3");

ran = new RandomAccessFile(file, "r");

System.out.println("文件装载完毕");

}

public static void main(String[] args) throws IOException {

Mp3 read = new Mp3();

byte[] buffer = new byte[128];

read.ran.seek(read.ran.length() - 128);

read.ran.read(buffer);

SongInfo info = new SongInfo(buffer);

System.out.println("name:" + info.getSongName() + " year:"

+ info.getYear() + " 歌手:" + info.getArtist() + " 专辑名:"

+ info.getAlbum() + " 备注:" + info.getComment());

}

}

package Mp3;

public class SongInfo {

private final String TAG = "TAG"; // 文件头1-3

private String songName; // 歌曲名4-33

private String artist; // 歌手名34-63

private String album; // 专辑名61-93

private String year; // 年94-97

private String comment; // 备注98-125

private byte r1, r2, r3; // 三个保留位126，127，128

private boolean valid; // 是否合法

public transient String fileName; // 此歌曲对应的文件名,没有封装

public SongInfo(byte[] data) {

if (data.length != 128) {

throw new RuntimeException("数据长度不合法:" + data.length);

}

String tag = new String(data, 0, 3);

// 只有前三个字节是TAG才处理后面的字节

if (tag.equalsIgnoreCase("TAG")) {

valid = true;

songName = new String(data, 3, 30).trim();

artist = new String(data, 33, 30).trim();

album = new String(data, 63, 30).trim();

year = new String(data, 93, 4).trim();

comment = new String(data, 97, 28).trim();

r1 = data[125];

r2 = data[126];

r3 = data[127];

} else {

valid = false;

}

}

public SongInfo() {

}

/**

* 返回是否合法

*

* @return 是否

*/

public boolean isValid() {

return valid;

}

/**

* 得到此对象的128个字节的表示形式

*

* @return

*/

public byte[] getBytes() {

byte[] data = new byte[128];

System.arraycopy(TAG.getBytes(), 0, data, 0, 3);

byte[] temp = songName.getBytes();

System.arraycopy(temp, 0, data, 3, temp.length > 30 ? 30 : temp.length);

temp = artist.getBytes();

System.arraycopy(temp, 0, data, 33, temp.length > 30 ? 30 : temp.length);

temp = album.getBytes();

System.arraycopy(temp, 0, data, 63, temp.length > 30 ? 30 : temp.length);

temp = year.getBytes();

System.arraycopy(temp, 0, data, 93, temp.length > 4 ? 4 : temp.length);

temp = comment.getBytes();

System.arraycopy(temp, 0, data, 97, temp.length > 28 ? 28 : temp.length);

data[125] = r1;

data[126] = r2;

data[127] = r3;

return data;

}

public String getArtist() {

return artist;

}

public void setArtist(String authorName) {

this.artist = authorName;

}

public String getComment() {

return comment;

}

public void setComment(String comment) {

this.comment = comment;

}

public byte getR1() {

return r1;

}

public void setR1(byte r1) {

this.r1 = r1;

}

public byte getR2() {

return r2;

}

public void setR2(byte r2) {

this.r2 = r2;

}

public byte getR3() {

return r3;

}

public void setR3(byte r3) {

this.r3 = r3;

}

public String getSongName() {

return songName;

}

public void setSongName(String songName) {

if (songName == null) {

throw new NullPointerException("歌名不能是null!");

}

valid = true;

this.songName = songName;

}

public String getAlbum() {

return album;

}

public void setAlbum(String specialName) {

this.album = specialName;

}

public String getYear() {

return year;

}

public void setYear(String year) {

this.year = year;

}

}