Android应用程序开发(音乐播放器)

Question

我正在做一个媒体播放器项目，我已经从sd卡中提取了所有歌曲，如下图所示。请在此处查看我的应用程序布局图像。。在此处输入图像描述

但现在我想在列表视图的图像视图中添加他们相应的歌曲专辑图像，其中绿色的android图像是。。。。像这样，我想创建它……看这里我想如何创建图片列表在此处输入图像描述

所以请告诉我如何获得每首歌的专辑艺术，并将它们设置在名字前面的列表视图中。。。。。。。。。

我获取歌曲的代码如下。。。。。。。。。。

public class SongList extends Activity{
Cursor c;
int index;
int count;
String audioFilePath;
MediaPlayer mp;
ArrayList songs;
public  void onCreate(Bundle SIS){
super.onCreate(SIS);
setContentView(R.layout.song_list);
String orderBy= MediaStore.Audio.Media.TITLE;
String cols[]=     {MediaStore.Audio.Media.DATA,MediaStore.Audio.Media.DISPLAY_NAME};
c=this.managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,cols,null,null,orderBy);
songs=new ArrayList();
if(c!=null){
while(c.moveToNext()){
songs.add(c.getString(1).toString());
}
}
ArrayAdapter adapter = new     ArrayAdapter(this,R.layout.custom_list_layout,R.id.listtext,songs);
final ListView lv =(ListView)findViewById(R.id.songlist);
lv.setAdapter(adapter);

Answer 1

几年前，我也开发了一个音乐应用程序，这是我检索专辑列表的功能
NB：现在已经快4年了，我没有更改代码，所以它可能不适合新的Android版本

private void        retrieveAlbums(){
try {
String      selection = MediaStore.Audio.Albums._ID + " != 0";
String[]    projection = {
"DISTINCT " + MediaStore.Audio.Albums._ID,
MediaStore.Audio.Albums.ALBUM_KEY,
MediaStore.Audio.Albums.ALBUM, 
MediaStore.Audio.Albums.ARTIST,
MediaStore.Audio.Albums.NUMBER_OF_SONGS
};
Cursor      cursor = context.getContentResolver().query(
MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
projection, selection, null, null);
Album       tmp = null;
if (cursor.moveToFirst()) {
do {
tmp = new Album(cursor.getInt(0),
cursor.getString(1),
cursor.getString(2),
cursor.getString(3),
cursor.getInt(4));
Uri sArtworkUri = Uri
.parse("content://media/external/audio/albumart");
Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, tmp.getId());
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(
context.getContentResolver(), albumArtUri);
} catch (FileNotFoundException exception) {
exception.printStackTrace();
bitmap = BitmapFactory.decodeResource(context.getResources(),
R.drawable.ic_launcher);
} catch (IOException e) {
e.printStackTrace();
bitmap = BitmapFactory.decodeResource(context.getResources(),
R.drawable.ic_launcher);
e.printStackTrace();
}
tmp.setArt(bitmap);
albumList.add(tmp);
} while (cursor.moveToNext());
}
cursor.close();
}  catch (SQLException e) {
Log.e("Exception on query albums", e.toString());
}
}

和专辑类

public class Album {
private int     id;
private String  key;
private String  name;
private String  artist;
private int     nbSong;
private Bitmap  art;
private Bitmap  banner;
public Album(int id, String key, String name, String artist, int nbSong) {
super();
this.id = id;
this.key = key;
this.name = name;
this.artist = artist;
this.nbSong = nbSong;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getNbSong() {
return nbSong;
}
public void setNbSong(int nbSong) {
this.nbSong = nbSong;
}
public String getArtist() {
return artist;
}
public void setArtist(String artist) {
this.artist = artist;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public Bitmap getArt() {
return art;
}
public void setArt(Bitmap art) {
this.art = art;
}
public Bitmap getBanner() {
return banner;
}
public void setBanner(Bitmap banner) {
this.banner = banner;
}
}

希望它能帮助你