/** 根据Id寻找歌曲 */
public static Song findSongById(int songId) {
for (Song s : mSongLib) {
if (s.getmSongId() == songId) {
return s;
}
}
return null;
}
/** 获取一个类型下的所有歌曲 */
public static ArrayList<Song> getGenreSongs(Genre genre) {
ArrayList<Song> songs = new ArrayList<>();
for (Song s : mSongLib) {
if (s.getmGenreId() == genre.getmGenreId()) {
songs.add(s);
}
}
return songs;
}
/** 获取该歌手的所有歌曲 */
public static ArrayList<Song> getArtistSong(Artist artist) {
ArrayList<Song> songs = new ArrayList<>();
for (Song s : mSongLib) {
if (s.getmArtistId() == artist.getmArtistId()) {
songs.add(s);
}
}
return songs;
}
/**
* 获取专辑下的所有歌曲
*
* @return 同一专辑的所有歌
*/
public static ArrayList<Song> getAlbumSongs(Album album) {
ArrayList<Song> songs = new ArrayList<>();
for (Song s : mSongLib) {
if (s.getmAlbumId() == album.getmAlbumId()) {
songs.add(s);
}
}
return songs;
}
/** 扫描类型， 并将Song与Genre关联 */
public static ArrayList<Genre> scanGenres(Context context) {
LogUtils.v(TAG, "scanGenres() called");
ArrayList<Genre> genres = new ArrayList<>();
Cursor cursor =
context
.getContentResolver()
.query(
MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI,
genreProjection,
null,
null,
MediaStore.Audio.Genres.NAME + " ASC");
LogUtils.v(TAG, cursor.getCount() + "");
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
int genreId = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Genres._ID));
String genreName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Genres.NAME));
// LogUtils.v(TAG, "get genres : id = " + genreId + " name = " + genreName);
Genre genre = new Genre(genreId, genreName);
genres.add(genre);
// 将歌曲与类型关联
Cursor genreCursor =
context
.getContentResolver()
.query(
MediaStore.Audio.Genres.Members.getContentUri("external", genreId),
new String[] {MediaStore.Audio.Media._ID},
MediaStore.Audio.Media.IS_MUSIC + " != 0 ",
null,
null);
genreCursor.moveToFirst();
for (int j = 0; j < genreCursor.getCount(); j++) {
genreCursor.moveToPosition(j);
int index = genreCursor.getColumnIndex(MediaStore.Audio.Media._ID);
final Song song = findSongById(genreCursor.getInt(index));
if (song != null) {
song.setmGenreId(genreId);
}
}
genreCursor.close();
}
cursor.close();
return genres;
}
/** 向歌单添加音乐 */
public static void addSongToPlaylist(
final Context context, final PlayList playlist, final Song song) {
Cursor cur =
context
.getContentResolver()
.query(
MediaStore.Audio.Playlists.Members.getContentUri(
"external", playlist.getmPlayListId()),
null,
null,
null,
MediaStore.Audio.Playlists.Members.TRACK + " ASC");
long count = 0;
if (cur.moveToLast()) {
count = cur.getLong(cur.getColumnIndex(MediaStore.Audio.Playlists.Members.TRACK));
}
cur.close();
ContentValues values = new ContentValues();
values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, count + 1);
values.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, song.getmSongId());
Uri uri =
MediaStore.Audio.Playlists.Members.getContentUri("external", playlist.getmPlayListId());
ContentResolver resolver = context.getContentResolver();
resolver.insert(uri, values);
resolver.notifyChange(Uri.parse("content://media"), null);
}
/** 获取歌曲的专辑,每首歌只有一个专辑 */
public static ArrayList<Album> getSongAlbum(Song song) {
ArrayList<Album> albums = new ArrayList<>();
for (Album a : mAlbumLib) {
if (a.getmAlbumId() == song.getmAlbumId()) {
albums.add(a);
break;
}
}
return albums;
}