我有几个显示 SD 卡中歌曲的 Activity 和 fragment ，当我点击其中任何一个时，它就会播放。问题是我必须在每个 Activity 和 fragment 中创建一个新的媒体播放器实例。因此，如果我在一个 Activity 中播放一首歌曲并在另一个 Activity 中播放另一首歌曲，那么两首歌曲将同时播放。我阅读了有关单例类和使媒体播放器静态化的信息，但我需要更多信息。下面是我的代码。
public class ArtistSongAlbumSong extends AppCompatActivity {
ArrayList<SongInfoModel> ArtistSongAlbumSongList = new ArrayList<>();
RecyclerView recyclerView_artistalbumsongs;
ArtistSongAlbumSongAdapter artistSongAlbumSongAdapter;
private static MediaPlayer player = new MediaPlayer();
Context isContext;
private int currentIndex;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_artistsongallsong);
recyclerView_artistalbumsongs = findViewById(R.id.recyclerView_artistSongAllSong);
isContext = ArtistSongAlbumSong.this;
Long albumid = getIntent().getExtras().getLong("album_id");
LinearLayoutManager aslinearLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView_artistalbumsongs.setLayoutManager(aslinearLayoutManager);
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + "!=0";
Cursor cursor = getApplicationContext().getContentResolver().query(uri, null, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String nameArtist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
Long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
Long newAlbumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumid);
if (newAlbumId.equals(albumid)) {
SongInfoModel s6 = new SongInfoModel(name, nameArtist, duration, data, albumArtUri);
ArtistSongAlbumSongList.add(s6);
}
} while (cursor.moveToNext());
}
cursor.close();
Collections.sort(ArtistSongAlbumSongList, new Comparator<SongInfoModel>() {
@Override
public int compare(SongInfoModel lhs, SongInfoModel rhs) {
return lhs.getSongName().compareTo(rhs.getSongName());
}
});
}
artistSongAlbumSongAdapter = new ArtistSongAlbumSongAdapter(getApplicationContext(), ArtistSongAlbumSongList);
artistSongAlbumSongAdapter.onItemClickListener(new ArtistSongAlbumSongAdapter.ArtistSongAlbumSongListener() {
@Override
public void onClickListener(SongInfoModel songInfoModel, int position, RelativeLayout relativeLayout, View view) {
MainActivity.setsongText(songInfoModel);
MainActivity.ButtonPlay();
MainActivity.PauseImage();
changeSelectedSong(position);
prepareSong(songInfoModel);
}
@Override
public void onLongClickListener(SongInfoModel songInfoModel, int position, RelativeLayout relativeLayout, View view) {
}
});
recyclerView_artistalbumsongs.setAdapter(artistSongAlbumSongAdapter);
player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
togglePlay(mediaPlayer);
}
});
player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
onSongCompletion1(mediaPlayer);
}
});
}
public void prepareSong(SongInfoModel song) {
player.reset();
try {
player.setDataSource(song.getData());
player.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
}
private void togglePlay(MediaPlayer mp) {
if (mp.isPlaying()) {
mp.stop();
mp.reset();
} else {
mp.start();
MainActivity.Handler(mp);
}
}
private void changeSelectedSong(int index){
// artistSongAlbumSongAdapter.notifyItemChanged(artistSongAlbumSongAdapter.getSelectedPosition());
currentIndex = index;
artistSongAlbumSongAdapter.setSelectedPosition(currentIndex);
// artistSongAlbumSongAdapter.notifyItemChanged(currentIndex);
}
private void onSongCompletion1(MediaPlayer mediaPlayer) {
if(currentIndex + 1 < ArtistSongAlbumSongList.size()){
SongInfoModel next = ArtistSongAlbumSongList.get(currentIndex +1);
changeSelectedSong(currentIndex + 1);
prepareSong(next);
MainActivity.setsongText(next);
}else{
SongInfoModel next1 = ArtistSongAlbumSongList.get(0);
changeSelectedSong(0);
prepareSong(ArtistSongAlbumSongList.get(0));
MainActivity.setsongText(next1);
}
}
单例类:
public class MyMediaPlayer extends MediaPlayer {
private static MyMediaPlayer mpclass ;
private MyMediaPlayer() {
}
public static MyMediaPlayer getInstance() {
if (mpclass == null) {
synchronized (MyMediaPlayer.class) {
if (mpclass == null) {
mpclass = new MyMediaPlayer();
}
}
}
return mpclass;
}
最佳答案
您需要按照以下步骤操作
1) 创建一个服务来播放音频并在此处创建 Media Player 实例 2)在 Activity 中绑定(bind)(它可以是你的基本 Activity ) 3)在 Activity 中使用服务引用来获取媒体播放器实例并完成。在所有 fragment 中使用 Activity 中的这个实例
关于android - 如何在所有 Activity 和 fragment 中使用 MediaPlayer 的单个实例？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47000130/