在Recyclerview中显示播放音乐项目

Question

我使用RecyclerView显示音乐列表。在每个项目中我都有ImageView，它显示当前播放的音乐。我用服务播放音乐。我的问题是当一首音乐完成后，他开始播放下一首音乐，而在Recyclerview项目中也必须显示下一个音乐。我该如何实现呢。

我尝试使用监听器。音乐在MusicService类中完成覆盖方法

  @Override
    public void onCompletion(MediaPlayer mp) {
        if(player.getCurrentPosition()>0){
            mp.reset();
            playNext();
            trackCompleted.letTrackCompleted();
            changeInfo.setTrackInfo();


        }
    }

当这个方法出现时，我尝试让音乐完成的知道适配器。 并手动尝试更改播放项目的图标

@Override
    public void letTrackCompleted() {
        notifyItemChanged(selected_position);
        selected_position= selected_position+1;
        notifyItemChanged(selected_position);
    }

MusicAdapter.class

private Context mContext;
private RecyclerView recyclerView;

int selected_position = 0;
int playing_position = 0;

private ArrayList<Song> songs = null;

public static SongPick songPick;
SharedPreferences sPref;

View myItemView;

MusicService musicService = new MusicService();

public KuilerAdapter(Context mContext, ArrayList<Song> theSongs, RecyclerView recyclerView) {
    this.mContext = mContext;
    this.recyclerView = recyclerView;
    songs=theSongs;
    sPref = mContext.getSharedPreferences("position",Context.MODE_PRIVATE);
    musicService.setTrackCompletedListener(this);
}

@Override
public void letTrackCompleted() {
    notifyItemChanged(selected_position);
    selected_position= selected_position+1;
    notifyItemChanged(selected_position);
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    public LinearLayout llSong;
    public TextView tvSongTitle;
    public TextView tvSongDescription;
    public ImageView imgEq;



    public MyViewHolder(View view) {
        super(view);
        llSong = (LinearLayout) view.findViewById(R.id.ll_song);
        tvSongTitle = (TextView)view.findViewById(R.id.song_title);
        tvSongDescription = (TextView)view.findViewById(R.id.song_description);
        imgEq = (ImageView) view.findViewById(R.id.play_eq);
    }
}

@Override
public MyViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
    final View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.d_media_list_item, parent, false);
    myItemView = itemView;
    musicService.setMusicInfoListener(this);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {

    Song currSong = songs.get(position);
    holder.tvSongTitle.setText(currSong.getTitle());
    holder.tvSongDescription.setText(currSong.getArtist());
    holder.llSong.setTag(position);

    sPref = mContext.getSharedPreferences("position", Context.MODE_PRIVATE);
    selected_position = sPref.getInt("position", 0);

    if(selected_position == position){
    AnimationDrawable animation = (AnimationDrawable)
                ContextCompat.getDrawable(mContext, R.drawable.ic_equalizer_white_36dp);
    DrawableCompat.setTintList(animation, ColorStateList.valueOf(ContextCompat.getColor(mContext,
            R.color.media_item_icon_playing)));
    holder.imgEq.setImageDrawable(animation);
    holder.imgEq.setVisibility(View.VISIBLE);
    animation.start();
    }
    else{
        holder.imgEq.setImageResource(R.drawable.ic_play_arrow_black);
    }

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Log.d("pl", "Click");

            notifyItemChanged(selected_position);
            selected_position = position;
            notifyItemChanged(selected_position);

            playing_position = position;

            songPick.songPicked(holder.itemView);

            AnimationDrawable animation = (AnimationDrawable)
                    ContextCompat.getDrawable(mContext, R.drawable.ic_equalizer_white_36dp);
            DrawableCompat.setTintList(animation, ColorStateList.valueOf(ContextCompat.getColor(mContext,
                    R.color.media_item_icon_playing)));
            holder.imgEq.setImageDrawable(animation);
            holder.imgEq.setVisibility(View.VISIBLE);
            animation.start();

        SharedPreferences.Editor editor = sPref.edit();
        editor.putInt("position", selected_position);
        editor.commit();

        }
    });
}


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

void setSongPickedListener(SongPick sp){
    songPick = sp;
}

}

MusicService.java

    public static final String EXTRA_CONNECTED_CAST = "com.example.android.uamp.CAST_NAME";

    private String songTitle="";
    private String songArtist = "";
    private static final int NOTIFY_ID=1;

    private boolean shuffle=false;
    private Random rand;

    //media player
    private MediaPlayer player;
    //song list
    private ArrayList<Song> songs;
    //current position
    private int songPosn;

    private final IBinder musicBind = new MusicBinder();
    public static ChangeInfo changeInfo;
    public static TrackCompleted trackCompleted;


    public void onCreate(){
        //create the service
        super.onCreate();
        //initialize position
        songPosn=0;
        //create player
        player = new MediaPlayer();
        initMusicPlayer();
        //for shuffle
        rand=new Random();
    }

    public void initMusicPlayer(){
        //set player properties

        player.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
        player.setAudioStreamType(AudioManager.STREAM_MUSIC);
        player.setOnPreparedListener(this);
        player.setOnCompletionListener(this);
        player.setOnErrorListener(this);
    }

    public void setList(ArrayList<Song> theSongs){
        songs=theSongs;
    }

    public void setSong(int songIndex){
        songPosn=songIndex;
    }

    public class MusicBinder extends Binder {

    public MusicService getService() {
        return MusicService.this;
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return musicBind;
    }

    @Override
    public boolean onUnbind(Intent intent){
//        player.stop();
//        player.release();
        return false;
    }

    public void playSong(){
        //play a song
        player.reset();
        //get song
        Song playSong = songs.get(songPosn);

        songTitle=playSong.getTitle();
        songArtist = playSong.getArtist();

        //get id
        long currSong = playSong.getID();
        //set uri
        Uri trackUri = ContentUris.withAppendedId(
                android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                currSong);
        try{
            player.setDataSource(getApplicationContext(), trackUri);
        }
        catch(Exception e){
            Log.e("MUSIC SERVICE", "Error setting data source", e);
        }

        player.prepareAsync();
    }

    @Override
    public void onDestroy() {
        stopForeground(true);
    }


    @Override
    public void onCompletion(MediaPlayer mp) {
        if(player.getCurrentPosition()>0){
            mp.reset();
            playNext();
            trackCompleted.letTrackCompleted();
            changeInfo.setTrackInfo();


        }
    }