Android应用开发（音乐播放器）

Question

我正在一个媒体播放器项目中，已从SD卡中取出了所有歌曲，如下图所示。 在此处查看我的应用布局图片。在此处输入图片说明

但现在我想在绿色Android图像所在的列表视图的图像视图上添加其对应的歌曲专辑图像。像这样，我要创建它........请参阅此处，我要用图片创建列表在这里输入图片说明

所以，请告诉我如何获取每首歌曲的专辑封面，并将它们设置在其名称前面的列表视图中.........

我的用于提取歌曲的代码如下..........

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。
注意：现在已经快四年了，我没有更改代码，因此可能不适合新的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;
}
}

希望对您有帮助