Android Studio 中的 SoundPool 到 MediaPlayer

Question

不幸的是，我没有意识到 SoundPool 只会播放大约 5 秒的任何文件，我正在尝试播放比这更大但已经使用 SoundPool 完成大部分代码的文件。所以我想知道如何轻松地将我的代码从使用 SoundPool 更改为 MediaPlayer？我主要担心的是，对于 SoundPool，我使用了一个名为 sample_music 的资产子文件中的所有文件，而 MediaPlayer 似乎无法做到这一点。任何帮助将非常感激！谢谢。

这是我使用 SoundPool 的两个主要文件：

public class Featured {
private static final String TAG = "Featured";
private static final String MUSIC_FOLDER = "sample_music";
private static final int MAX_SONGS = 1; //One song can be played at a time
private AssetManager mAssets;
private List<Song> mSongs = new ArrayList<>();
private SoundPool mSoundPool;

public Featured(Context context) {
    mAssets = context.getAssets();
    mSoundPool = new SoundPool(MAX_SONGS, AudioManager.STREAM_MUSIC, 0);
    loadFeatured();
}

public void play(Song song) {
    Integer songId = song.getSongId();
    if (songId == null) { return; } //No song
    mSoundPool.play(songId, 1.0f, 1.0f, 1, 0, 1.0f);
}

private void loadFeatured() {
    String[] songTitles;
    try {
        songTitles = mAssets.list(MUSIC_FOLDER);
        Log.i(TAG, "Found " + songTitles.length + " songs");
    } catch (IOException ioe) {
        Log.e(TAG, "Could not list assets", ioe);
        return;
    }

    //Build a list of songs
    for (String filename : songTitles){
        try {
            String assetPath = MUSIC_FOLDER + "/" + filename;
            Song song = new Song(assetPath);
            load(song);
            mSongs.add(song);
        } catch (IOException ioe) {
            Log.e(TAG, "Could not load song " + filename, ioe);
        }
    }
}

//Load songs
public void load(Song song)throws IOException {
    AssetFileDescriptor afd = mAssets.openFd(song.getAssetPath());
    int songId = mSoundPool.load(afd, 1); //load for later playback
    song.setSongId(songId);
}

public List<Song> getSongs() {
    return mSongs;
}
}

还有另一个文件：

public class FeaturedFragment extends Fragment {
private Featured mFeatured;

public static FeaturedFragment newInstance() {
    return new FeaturedFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mFeatured = new Featured(getActivity());
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    //Load recycler view of featured songs
    View view = inflater.inflate(R.layout.fragment_featured, container, false);
    RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.fragment_featured_recycler_view);
    //set 3 songs per row
    recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3));
    recyclerView.setAdapter(new SoundAdapter(mFeatured.getSongs()));
    return view;
}

private class SoundHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
    private Button mButton;
    private Song mSong;

    public SoundHolder(LayoutInflater inflater, ViewGroup container) {
        super(inflater.inflate(R.layout.list_item_sound, container, false));
        mButton = (Button)itemView.findViewById(R.id.list_item_sound_button);
        mButton.setOnClickListener(this);
    }

    public void bindSong(Song song) {
        mSong = song;
        mButton.setText(mSong.getTitle());
    }

    @Override
    public void onClick(View v) {
        mFeatured.play(mSong);
    }
}
private class SoundAdapter extends RecyclerView.Adapter<SoundHolder> {
    private List<Song> mSongs;
    public SoundAdapter(List<Song> songs) {
        mSongs = songs;
    }

    private MediaPlayer mMediaPlayer;

    @Override
    public SoundHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(getActivity());
        return new SoundHolder(inflater, parent);
    }
    @Override
    public void onBindViewHolder(SoundHolder soundHolder, int position) {
        Song song = mSongs.get(position);
        soundHolder.bindSong(song);
    }
    @Override
    public int getItemCount() {
        return mSongs.size();
    }
}

感谢您的帮助！

Answer 1

使用 SoundPool，您确实会调用 load() 方法，它会为您希望稍后播放的每个音频文件分配一个 id。使用 MediaPlayer，您只需在列表中添加绝对路径。每当您想播放歌曲时。只需从列表中选择一首歌曲，将其传递给 MediaPlayer 的静态 create() 方法，然后调用 start() 方法即可开始播放音频文件。这是一个例子

   public void PlaySong(Context context, string songToPlay) {

   MediaPlayer player = MediaPlayer.create(context,Uri.parse(songToPlay));

   if (player != null) {
       player.start() 
   }
}

就是这样。希望对您过渡到使用 MediaPlayer 有所帮助。