如何在recyclerView中自动播放歌曲？

我正在构建音乐播放器应用程序，并使用sd卡中的歌曲填充recyclerView。我也设置了onClickListeners。所以当我点击一个项目（歌曲）时，那个特定位置的歌曲开始播放。我想要的是当它完成播放时，我希望下一首歌曲能像现代音乐播放器一样自动播放。我知道我必须使用OnCompletionListener，但我无法弄清楚。如何在recyclerView中自动播放歌曲？

我是Android新手。

Songs.java（这是一个片段）：

public class Songs extends Fragment { 

public static final String Broadcast_PLAY_NEW_AUDIO = "com.musicplayer.musicana.PlayNewAudio"; 
public static final String TAG = "Songs"; 
RecyclerView recyclerView; 
private ArrayList<SongInfoModel> SongList = new ArrayList<SongInfoModel>(); 
SongAdapter songAdapter; 
ScaleInAnimationAdapter alphaAdapter; 
MediaPlayer mediaPlayer; 
MainActivity mainActivity; 
private MediaPlayerService player; 
boolean serviceBound = false; 


@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.songs_activity, container, false); 

    // Activity activity = getActivity(); 

    final MainActivity activity=(MainActivity)getActivity(); 


    recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView); 
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext()); 
    recyclerView.setLayoutManager(linearLayoutManager); 


    songAdapter = new SongAdapter(getContext(), SongList, new SongAdapter.RecyclerItemClickListener() { 
     @Override 
     public void onClickListener(SongInfoModel song, int position) { 

      Toast.makeText(getContext(), song.getSongName(), Toast.LENGTH_SHORT).show(); 

      Activity activity = getActivity(); 
      if (activity instanceof MainActivity) { 

       mainActivity = (MainActivity) activity; 
       mainActivity.setsongText(song); 
       ((MainActivity) activity).ButtonPause(); 

      } 
      prepareSong(song); 



     } 

     @Override 
     public void onLongClickListener(SongInfoModel song, int position) { 
      Toast.makeText(getContext(), "You long clicked me, thank you!", Toast.LENGTH_SHORT).show(); 
     } 


    }); 

    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
    String selection = MediaStore.Audio.Media.IS_MUSIC + "!=0"; 
    Cursor cursor = getActivity().getContentResolver().query(uri, null, selection, null, null); 
    if (cursor != null) { 
     if (cursor.moveToFirst()) { 
      do { 
       String name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); 
       String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); 
       Long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); 
       String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); 
       Long albumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)); 
       Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart"); 
       Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId); 



       SongInfoModel s = new SongInfoModel(name, artist, null, null, null, duration, data,albumArtUri); 
       SongList.add(s); 

      } while (cursor.moveToNext()); 
     } 


     cursor.close(); 

     Collections.sort(SongList, new Comparator<SongInfoModel>() { 
      @Override 
      public int compare(SongInfoModel lhs, SongInfoModel rhs) { 
       return lhs.getSongName().compareTo(rhs.getSongName()); 
      } 
     }); 



    } 


    alphaAdapter = new ScaleInAnimationAdapter(songAdapter); 
    alphaAdapter.setDuration(1000); 
    alphaAdapter.setInterpolator(new OvershootInterpolator()); 
    alphaAdapter.setFirstOnly(false); 
    recyclerView.setAdapter(alphaAdapter); 
    alphaAdapter.notifyDataSetChanged(); 


    mediaPlayer = new MediaPlayer(); 
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); 



    mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { 
     @Override 
     public void onPrepared(MediaPlayer mp) { 

      togglePlay(mp); 
     } 
    }); 

    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
     @Override 
     public void onCompletion(MediaPlayer mediaPlayer) { 




     } 
    }); 

    activity.setOnSongClickListener(new MainActivity.OnSongCickListener() { 
     @Override 
     public void onsongClicked() { 
      if(mediaPlayer.isPlaying() && mediaPlayer!=null){ 

       mediaPlayer.pause(); 
       activity.ButtonPlay(); 


      } else { 

       mediaPlayer.start(); 
       activity.ButtonPause(); 

      } 
     } 
    }); 




    return view; 
} 




private void prepareSong(SongInfoModel song) { 


    mediaPlayer.reset(); 


    try { 
     mediaPlayer.setDataSource(song.getData()); 
     mediaPlayer.prepareAsync(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 

private void togglePlay(MediaPlayer mp) { 

    if (mp.isPlaying()) { 
     mp.stop(); 

     mp.reset(); 
    } else { 

     mp.start(); 


    } 


}

SongAdapter.java（recyclerVIews适配器）：

public class SongAdapter extends RecyclerView.Adapter<SongAdapter.SongHolder> { 

ArrayList<SongInfoModel> SongList = new ArrayList<>(); 
Context context; 
private RecyclerItemClickListener listener; 





public SongAdapter(Context context, ArrayList<SongInfoModel> SongList, RecyclerItemClickListener listener) { 

    this.context = context; 
    this.SongList = SongList; 
    this.listener = listener; 

} 




@Override 
public SongAdapter.SongHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View view = LayoutInflater.from(context).inflate(R.layout.row_song, parent, false); 
    return new SongHolder(view); 
} 

@Override 
public void onBindViewHolder(final SongAdapter.SongHolder holder, final int position) { 



    final SongInfoModel songInfoModel = SongList.get(position); 

    if(songInfoModel!= null){ 

    holder.songName.setText(songInfoModel.SongName); 
    holder.artistName.setText(songInfoModel.ArtistName); 
    holder.duration.setText(String.valueOf(songInfoModel.duration)); 
    String duration = Utility.convertDuration(songInfoModel.getDuration()); 
    holder.duration.setText(duration); 
     Picasso.with(context).load(songInfoModel.getAlbumID()).placeholder(R.drawable.ic_launcher).into(holder.iv_artwork); 

     holder.bind(songInfoModel, listener); 
    } 

} 

@Override 
public int getItemCount() { 
    return SongList.size(); 
} 

public class SongHolder extends RecyclerView.ViewHolder { 
    TextView songName; 
    TextView artistName; 
    TextView duration; 
    private ImageView iv_artwork; 


    public SongHolder(View itemView) { 

     super(itemView); 
     songName = (TextView)itemView.findViewById(R.id.SongName); 
     artistName= (TextView)itemView.findViewById(R.id.ArtistName); 
     duration = (TextView) itemView.findViewById(R.id.duration); 
     iv_artwork = (ImageView) itemView.findViewById(R.id.iv_artwork); 

    } 

    public void bind(final SongInfoModel songInfoModel, final RecyclerItemClickListener listener) { 
     itemView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       listener.onClickListener(songInfoModel, getLayoutPosition()); 

      } 
     }); 

     itemView.setOnLongClickListener(new View.OnLongClickListener() { 

      @Override 
      public boolean onLongClick(View view) { 

       listener.onLongClickListener(songInfoModel, getLayoutPosition()); 
       return true; 
      } 
     }); 

    } 



} 




public interface RecyclerItemClickListener{ 

    void onClickListener(SongInfoModel song, int position); 
    void onLongClickListener(SongInfoModel song, int position); 

} 







}

来源

2017-10-06 Sebin Paul

我刚刚发现了解决方案！这很容易！

在SongAdapter.java：添加此，

private int selectedPosition; 

public void setSelectedPosition(int selectedPosition) { 
    this.selectedPosition = selectedPosition; 
} 

public int getSelectedPosition() { 
    return selectedPosition; 
}

在Songs.java：添加此，

private void changeSelectedSong(int index){ 
    songAdapter.notifyItemChanged(songAdapter.getSelectedPosition()); 
    currentIndex = index; 
    songAdapter.setSelectedPosition(currentIndex); 
    songAdapter.notifyItemChanged(currentIndex); 

} 


mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
     @Override 
     public void onCompletion(MediaPlayer mp) { 



      if(currentIndex + 1 < SongList.size()){ 
       SongInfoModel next = SongList.get(currentIndex + 1); 
       changeSelectedSong(currentIndex+1); 
       prepareSong(next); 
       mainActivity.setsongText(next); 
      }else{ 
       SongInfoModel next = SongList.get(0); 
       changeSelectedSong(0); 
       prepareSong(next); 
       mainActivity.setsongText(next); 
      } 



     } 
    });

并调用的onClick changeSelectedSong（位置）。

来源

2017-10-06 14:24:27

您可以使用媒体播放器的监听器完成这样

mediaPlayer.setOnCompletionListener（new OnCompletionListener（）{

 public void onCompletion(MediaPlayer mp) { 
      //pass the path of the new song here 
     } 
    });

来源

2017-10-06 12:16:40

是的，我知道，但我的代码，我不知道如何通过下一首歌的位置，以便媒体播放器播放它。你能看看我的代码，并告诉？我知道这很愚蠢，但我是新的！ –

当您播放某首歌曲时，您将拥有SongList，然后保存该歌曲的索引。例如，当您打开onCompletion时您现在播放歌曲索引5，您只需播放下一首歌曲songindex ++即6 .. –

您是否将歌曲的路径保存在Arraylist中？ –

如何在recyclerView中自动播放歌曲？

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