问题

我有一个RecyclerView，其listitem的设计如下：

• LinearLayout（水平布局）
  • 图像视图（ImageView）
  • 文本视图（TextView）
  • 图像按钮（播放按钮）（ImageButton）
  • 均衡器视图（不可见）（EqualizerView）

现在，当我点击播放按钮时，应该隐藏播放按钮，并显示均衡器，如果我滚动列表，均衡器应该始终停留在所选项目上。

然而，我面临的问题是均衡器视图以每隔 10 个项目的间隔显示。也就是说，如果我点击第 3 个项目，那么均衡器将显示在第 3、13 等位置...

我正在使用这个库来实现迷你均衡器：https://github.com/claucookie/mini-equalizer-library-android。

public class StationViewAdapter extends RecyclerView.Adapter<StationViewAdapter.StationViewHolder> {

    List<Station> stations;
    final private ListItemClickListener mOnClickListener;
  
    public  StationViewAdapter (List<Station> s, ListItemClickListener l)
    {
        stations = s;
        mOnClickListener = l;
    }

    @NonNull
    @Override
    public StationViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item,parent,false);
        return new StationViewHolder(v);
    }

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

        Station station = stations.get(position);
        if(!station.getArtwork().isEmpty() && station.getArtwork() != null)
        {
            try{
                Picasso.get().load(Uri.parse(station.getArtwork()))
                       // .placeholder(R.mipmap.ic_launcher)
                        .into(holder.stationArtwork);
            } catch (Exception e) {
                e.printStackTrace();
                holder.stationArtwork.setImageResource(R.mipmap.ic_launcher);
            }
        }
        else
            holder.stationArtwork.setImageResource(R.mipmap.ic_launcher);
        holder.stationName.setText(station.getName());
      
    }


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

    public class StationViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        ImageView stationArtwork;
        TextView stationName;
        ImageButton stationPlayButton;
        EqualizerView equalizerView;
        int selectedItem;
        public StationViewHolder(@NonNull View itemView) {
            super(itemView);
            stationArtwork = itemView.findViewById(R.id.favicon);
            stationName = itemView.findViewById(R.id.text);
            stationPlayButton = itemView.findViewById(R.id.play_button);
            equalizerView = itemView.findViewById(R.id.equalizer_view);
            itemView.setOnClickListener(this);
            stationPlayButton.setOnClickListener(this);
            selectedItem = getAdapterPosition();
        }

        @Override
        public void onClick(View v) {
            int clickPosition = getAdapterPosition();
            Log.d(TAG, "onClick: " + getAdapterPosition());
            Log.d(TAG, "onClick: " + getLayoutPosition());
            Log.d(TAG, "onClick: " + getItemId());
            if(v == itemView) {
                mOnClickListener.onListItemClick(clickPosition);
            }else if(v == stationPlayButton)
            {
                  
                mOnClickListener.onListItemPlay(clickPosition,stationPlayButton,equalizerView);
                   
            }

        }
    }
    public interface ListItemClickListener {
        void onListItemClick(int clickedItemIndex);
        void onListItemPlay(int clickItemIndex,ImageButton i,EqualizerView eq);
    }
}

这是主活动中的点击监听器：

@Override
public void onListItemClick(int clickedItemIndex) {

     if(mToast !=null)
     {
         mToast.cancel();
     }
     mToast = Toast.makeText(this,"Main Activity item clicked at position"+clickedItemIndex,Toast.LENGTH_SHORT);
     mToast.show();
}


@Override
public void onListItemPlay(int clickItemIndex,ImageButton i , EqualizerView eq) {

    i.setVisibility(View.GONE);
    eq.setVisibility(View.VISIBLE);
    eq.animateBars();
   
}

public class StationViewAdapter extends RecyclerView.Adapter<StationViewAdapter.StationViewHolder> {
List<Station> statons;
final private ListItemClickListener mOnClickListener;
public  StationViewAdapter (List<Station> s, ListItemClickListener l)
{
statons = s;
mOnClickListener = l;
}
@NonNull
@Override
public StationViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item,parent,false);
return new StationViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull final StationViewHolder holder, int position) {
Station station = statons.get(position);
if(!station.getArtwork().isEmpty() && station.getArtwork() != null)
{
try{
Picasso.get().load(Uri.parse(station.getArtwork()))
// .placeholder(R.mipmap.ic_launcher)
.into(holder.stationArtwork);
} catch (Exception e) {
e.printStackTrace();
holder.stationArtwork.setImageResource(R.mipmap.ic_launcher);
}
}
else
holder.stationArtwork.setImageResource(R.mipmap.ic_launcher);
holder.stationName.setText(station.getName());
}
@Override
public int getItemCount() {
return statons.size();
}
public class StationViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
ImageView stationArtwork;
TextView stationName;
ImageButton stationPlayButton;
EqualizerView equalizerView;
int selectedItem;
public StationViewHolder(@NonNull View itemView) {
super(itemView);
stationArtwork = itemView.findViewById(R.id.favicon);
stationName = itemView.findViewById(R.id.text);
stationPlayButton = itemView.findViewById(R.id.play_button);
equalizerView = itemView.findViewById(R.id.equalizer_view);
itemView.setOnClickListener(this);
stationPlayButton.setOnClickListener(this);
selectedItem = getAdapterPosition();
}
@Override
public void onClick(View v) {
int clickPosition = getAdapterPosition();
Log.d(TAG, "onClick: "+getAdapterPosition());
Log.d(TAG, "onClick: "+getLayoutPosition());
Log.d(TAG, "onClick: "+getItemId());
if(v == itemView) {
mOnClickListener.onListItemClick(clickPosition);
}else if(v == stationPlayButton)
{
mOnClickListener.onListItemPlay(clickPosition,stationPlayButton,equalizerView);
}
}
}
public interface ListItemClickListener {
void onListItemClick(int clickedItemIndex);
void onListItemPlay(int clickItemIndex,ImageButton i,EqualizerView eq);
}
}

@Override
public void onListItemClick(int clickedItemIndex) {
if(mToast !=null)
{
mToast.cancel();
}
mToast = Toast.makeText(this,"Main Activity item clicked at position"+clickedItemIndex,Toast.LENGTH_SHORT);
mToast.show();
}
@Override
public void onListItemPlay(int clickItemIndex,ImageButton i , EqualizerView eq) {
i.setVisibility(View.GONE);
eq.setVisibility(View.VISIBLE);
eq.animateBars();
}

答案1

得分: 0

RecyclerView会重复使用ViewHolder实例。您需要在onBindViewHolder内部使ViewHolder的状态无效。在您的情况下，您至少应该隐藏EqualizerView：

@Override
public void onBindViewHolder(@NonNull final StationViewHolder holder, int position) {
    equalizerView.setVisibility(View.INVISIBLE);
    // 其他操作
}

此外，您还应该保存正在播放的歌曲，以便稍后初始化ViewHolder的状态。

更多信息请参见：https://developer.android.com/guide/topics/ui/layout/recyclerview#structure

@Override
public void onBindViewHolder(@NonNull final StationViewHolder holder, int position) {
equalizerView.setVisibility(View.INVISIBLE);
....
}