首先提一下我的UI设计，对于主页面，用到了侧滑效果，这样在一个页面上可以有更多按钮而不显得拥挤，其实也就是我的另一篇博客中(http://blog.csdn.net/ye_yun_lin/article/details/23177987)提到的方法，而我自己没有重新写，直接拿过来用。下面是我三个Activity的布局设计：

home.xml：

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal"

tools:context=".MainActivity" >

android:id="@+id/menu"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/repeat_bg"

android:gravity="bottom|center_horizontal"

android:orientation="vertical" >

android:layout_width="match_parent"

android:layout_height="50dp"

android:orientation="horizontal"

android:paddingBottom="10dp" >

android:layout_width="match_parent"

android:layout_height="40dp"

android:layout_weight="1" >

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:paddingLeft="25dp"

android:text="My Music"

android:textColor="@android:color/black"

android:textSize="35dp" />

android:layout_width="match_parent"

android:layout_height="40dp"

android:layout_weight="3"

android:gravity="center_horizontal" >

android:id="@+id/button1"

android:layout_width="40dp"

android:layout_height="40dp"

android:background="@drawable/home_chilun_item_press"

android:clickable="true" />

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:paddingBottom="25dp" >

android:id="@+id/listbutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_marginRight="5dp"

android:background="@drawable/list_item_press" />

android:id="@+id/cloudbutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_marginLeft="5dp"

android:layout_toRightOf="@id/listbutton"

android:background="@drawable/cloud_item_press" />

android:id="@+id/lovebutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_below="@id/listbutton"

android:layout_marginTop="10dp"

android:background="@drawable/love_item_press" />

android:id="@+id/localbutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_alignLeft="@id/cloudbutton"

android:layout_alignTop="@id/lovebutton"

android:background="@drawable/local_item_press" />

android:id="@+id/cechebutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_below="@id/lovebutton"

android:layout_marginTop="10dp"

android:background="@drawable/cache_item_press" />

android:id="@+id/downloadbutton"

android:layout_width="110dp"

android:layout_height="110dp"

android:layout_alignLeft="@id/localbutton"

android:layout_alignTop="@id/cechebutton"

android:background="@drawable/dowmload_item_press" />

android:layout_width="match_parent"

android:layout_height="64dp"

android:background="@drawable/mini_background"

android:orientation="horizontal" >

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_weight="2"

android:src="@drawable/pan" />

android:id="@+id/clickToPlaying"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_weight="1"

android:clickable="true"

android:orientation="vertical"

android:paddingLeft="5dp"

android:paddingTop="12dp" >

android:id="@+id/music_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Music Map"

android:textColor="@android:color/white"

android:textSize="18dp" />

android:id="@+id/singer_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="音乐与你同在"

android:textColor="@android:color/white"

android:textSize="12dp" />

android:id="@+id/homepause"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_weight="2"

android:background="@drawable/home_button_item"

android:clickable="true" />

android:id="@+id/content"

android:layout_width="180dp"

android:layout_height="match_parent"

android:background="@drawable/content_background"

android:orientation="vertical" >

android:id="@+id/scanningtbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview1"

style="@style/imageviewstyle"

android:src="@drawable/music" />

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview1"

android:text="扫描音乐" />

android:id="@+id/playingbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview2"

style="@style/imageviewstyle"

android:src="@drawable/musicplaying" />

android:id="@+id/statustext"

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview2"

android:text="顺序播放" />

android:id="@+id/sleepbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview3"

style="@style/imageviewstyle"

android:src="@drawable/sleep" />

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview3"

android:text="睡眠模式" />

android:id="@+id/downbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview4"

style="@style/imageviewstyle"

android:src="@drawable/down" />

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview4"

android:text="下载管理" />

android:id="@+id/soundbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview5"

style="@style/imageviewstyle"

android:src="@drawable/vivo" />

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview5"

android:text="音效" />

android:id="@+id/managerbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview6"

style="@style/imageviewstyle"

android:src="@drawable/maneger" />

style="@style/textviewstyle"

android:layout_toRightOf="@id/imageview6"

android:text="设置" />

android:id="@+id/aboutbutton"

style="@style/Relativelayoutstyle" >

android:id="@+id/imageview7"

style="@style/imageviewstyle"

android:src="@drawable/man" />

style="@style/textviewstyle"

android:layout_width="wrap_content"

android:layout_toRightOf="@id/imageview7"

android:text="关于我们" />

music_list.xml：

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/RelativeLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#ecebd7">

android:id="@+id/top"

android:layout_width="fill_parent"

android:layout_height="50dp"

android:background="@drawable/main_top_bar_bg">

android:id="@+id/backtohome"

android:layout_width="60dp"

android:layout_height="50dp"

android:clickable="true"

android:background="@drawable/activity_item_back"/>

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="所有歌曲"

android:textSize="25dp"

android:layout_centerInParent="true"

android:textColor="@android:color/black" />

android:layout_below="@id/top"

android:padding="5dp"

android:id="@android:id/list"

android:layout_width="match_parent"

android:layout_height="wrap_content" >

music_start.xml：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:background="#ecebd7" >

android:id="@+id/playingtop"

android:layout_width="fill_parent"

android:layout_height="50dp"

android:background="@drawable/main_top_bar_bg" >

android:id="@+id/back"

android:layout_width="60dp"

android:layout_height="50dp"

android:background="@drawable/activity_item_back"

android:clickable="true" />

android:id="@+id/music_start_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerInParent="true"

android:text="歌曲"

android:textColor="@android:color/black"

android:textSize="20dp" />

android:id="@+id/music_repeat"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@id/playingtop"

android:background="@drawable/repeat_item_press" />

android:id="@+id/music_shuffl"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:layout_below="@id/playingtop"

android:background="@drawable/shuffle_item_press" />

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_below="@id/playingtop"

android:layout_centerInParent="true" >

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:scaleType="fitCenter"

android:src="@drawable/default_play_activity_bg1" />

android:id="@+id/seekbarLayout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_above="@+id/kongzhi"

android:background="@android:color/white" >

android:id="@+id/audioTrack"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:paddingBottom="2dp"

android:paddingTop="4dp"

android:progressDrawable="@drawable/seekbar_drawable"

android:thumb="@drawable/seekbar_thumb" />

android:id="@+id/current_progress"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@id/audioTrack"

android:text="00:00"

android:textColor="@android:color/black" />

android:id="@+id/final_progress"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:layout_below="@id/audioTrack"

android:text="00:00"

android:textColor="@android:color/black" />

android:id="@+id/kongzhi"

android:layout_width="match_parent"

android:layout_height="64dp"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"

android:background="@android:color/white"

android:orientation="horizontal" >

android:layout_width="wrap_content"

android:layout_height="64dp"

android:layout_weight="1"

android:gravity="center_horizontal" >

android:id="@+id/music_last"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@drawable/back_item_press" />

android:layout_width="wrap_content"

android:layout_height="64dp"

android:layout_weight="1"

android:gravity="center_horizontal" >

android:id="@+id/music_this"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@drawable/begin_item_press" />

android:layout_width="wrap_content"

android:layout_height="64dp"

android:layout_weight="1"

android:gravity="center_horizontal" >

android:id="@+id/music_next"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@drawable/go_item_press" />

对于UI的设计给大家参考一下，说实话，自己的美感太不行了，所以也是借鉴了好几个音乐播放器的界面。

言归正题：如何将内存卡中Mp3文件读取出来并显示在列表中？

先建立一个Mp3Info对象：

package com.ye_yun_lin.Activity;

public class Mp3Info {

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 Mp3Info() {

super();

}

public Mp3Info(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;

}

@Override

public String toString() {

return "Mp3Info [id=" + id + ", title=" + title + ", album=" + album

+ ", albumId=" + albumId + ", displayName=" + displayName

+ ", artist=" + artist + ", duration=" + duration + ", size="

+ size + ", url=" + url + ", lrcTitle=" + lrcTitle

+ ", 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;

}

}

查询歌曲的信息，保存在list中：

public static List getMp3Infos(Context context) {

Cursor cursor = context.getContentResolver().query(

MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,

MediaStore.Audio.Media.DEFAULT_SORT_ORDER);

List mp3Infos = new ArrayList();

for (int i = 0; i < cursor.getCount(); i++) {

Mp3Info mp3Info = new Mp3Info();

cursor.moveToNext();

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

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

mp3Info.setId(id);

mp3Info.setTitle(title);

mp3Info.setArtist(artist);

mp3Info.setDuration(duration);

mp3Info.setSize(size);

mp3Info.setUrl(url);

mp3Infos.add(mp3Info);

}

}

return mp3Infos;

}

填充ListView：

public void setListAdpter(List mp3Infos) {

List> mp3list = new ArrayList>();

for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {

Mp3Info mp3Info = (Mp3Info) iterator.next();

HashMap map = new HashMap();

map.put("title", mp3Info.getTitle());

map.put("Artist", mp3Info.getArtist());

map.put("duration", MediaUtil.Format(mp3Info.getDuration()));

map.put("size", String.valueOf(mp3Info.getSize()));

map.put("url", mp3Info.getUrl());

mp3list.add(map);

}

mAdapter = new SimpleAdapter(this, mp3list,

R.layout.music_list_item_layout, new String[] { "title",

"Artist", "duration" }, new int[] { R.id.music_title,

R.id.music_Artist, R.id.music_duration });

setListAdapter(mAdapter);

}

上面的MediaUtil.format(),是将时间换算为00:00的方法：

public static String Format(long time) {

SimpleDateFormat format = new SimpleDateFormat("mm:ss");

String hmsString = format.format(time);

return hmsString;

}

最后效果为下：