Question

在我的应用程序的recyclerview中，每个项目都有播放/暂停按钮来启动/停止媒体播放器。有许多事件，如下载进度，播放和停止音乐。我将使用广播接收器或以其他方式处理事件并立即更新UI。我不知道在活动中访问播放或暂停按钮。

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, @SuppressLint("RecyclerView") final int position) {

        holder.downloading.setVisibility(View.INVISIBLE);
        holder.equalizer.setVisibility(View.INVISIBLE);
                      holder.btnPlay.setVisibility(View.VISIBLE);
            holder.btnPause.setVisibility(View.INVISIBLE);
        }
    }

     public  class MyViewHolder extends RecyclerView.ViewHolder {

        private ImageButton btnPlay, btnPause;
        TextView title, id;
        private ImageView trackImage, downloaded;
        private GifImageView equalizer, downloading;
        private CardView cardView;


  public MyViewHolder(View itemView) {
        super(itemView);

            equalizer = itemView.findViewById(R.id.eq);
            downloading = itemView.findViewById(R.id.loading);
            btnPlay = itemView.findViewById(R.id.play);
            btnPause = itemView.findViewById(R.id.pause);


            btnPlay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    MyOnClickListener.playOnClick(v, getAdapterPosition());
                }
            });

            btnPause.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    MyOnClickListener.pauseOnClick(v, getAdapterPosition());
                }
            });

        }

和内部活动，这里我可以访问 btnPlay ， btnPause ，...，以便在specefic时间将它们设置为可见或不可见：

 adapter = new Adapter(tracks, this, new Adapter.MyAdapterListener() {
        @Override
        public void playOnClick(View v, int position) {


            if (//true) {
                adapter.notifyItemChanged(currentItem, //?);
            } 

               // hide some views in recyclerview's item and show some others

            } else {
                //...
            }
}

更新

                for (int i = 0; i < tracks.size(); i++) {
                Track track = tracks.get(i);
                if (track.getPlayStatus()) {
                    track.setPlayStatus(false);
                    //tell the RecyclerView this data position has changes
                    adapter.notifyItemChanged(i);
                    break;
                }
            }

            Track track = tracks.get(position);
            track.setPlayStatus(true);
            adapter.notifyItemChanged(position);

和 onBindViewHolder ：

if (track.getPlayStatus()) {
        holder.btnPlay.setVisibility(View.INVISIBLE);
        holder.btnPause.setVisibility(View.VISIBLE);
        //other sets you need
    } else {
        holder.btnPlay.setVisibility(View.VISIBLE);
        holder.btnPause.setVisibility(View.INVISIBLE);        }

Answer 1

如果您需要更改特定行的项目，则不需要将任何内容传递给Activity。让我们说点击您的列表项进行播放。然后，您只需将数据项的相应isPlaying标记（如果它尚未添加）添加到true，如下所示，并通知适配器有更改：

@Override
public void playOnClick(View v, int position) {
    // reset playing state for a previous track if only one item can be played at a time
    for (int i = 0; i < trackList.size(); i++) {
        Track track = trackList.get(i);
        if (track.isPlaying()) {
            track.setIsPlaying(false);
            //tell the RecyclerView this data position has changes
            adapter.notifyItemChanged(i);
            break;
        }    
    } 

    Track track = trackList.get(position);
    track.setIsPlaying(true); 
    //initiate the RecyclerView redrawal
    adapter.notifyItemChanged(position);
}

您的pauseOnClick可能是：

@Override
public void pauseOnClick(View v, int position) {
    Track track = trackList.get(position);
    track.setIsPlaying(false); 
    //initiate the RecyclerView redrawal
    adapter.notifyItemChanged(position); 
}

在onBindViewHolder中，根据您传递的适配器数据更改项目可见性：

@Override
public void onBindViewHolder(@NonNull Wkdapter.Holder holder, int position) {
    Track track = trackListList.get(position);
    if (track.isPlaying()) {
        holder.btnPlay.setVisibility(View.VISIBLE);
        holder.btnPause.setVisibility(View.INVISIBLE);
        //other sets you need
    } else {
        holder.btnPlay.setVisibility(View.INVISIBLE);
        holder.btnPause.setVisibility(View.VISIBLE);
       //your other inits
    } 
}

Answer 2

你应该跟踪当前的比赛位置来解决这个问题。诀窍是刷新当前播放的视图以及新单击的视图

public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> {

    private int currentPlayingPosition = -1;
    private MyOnClickListener mMyOnClickListener;

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // return viewholder
    }

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

        if (position == currentPlayingPosition) {
            holder.btnPlay.setVisibility(View.GONE);
            holder.btnPause.setVisibility(View.VISIBLE);
        } else {
            holder.btnPlay.setVisibility(View.GONE);
            holder.btnPause.setVisibility(View.VISIBLE);
        }

        // other bindings
    }

    @Override
    public int getItemCount() {
        // return size
    }

    public void setMyOnClickListener(MyOnClickListener myOnClickListener) {
        mMyOnClickListener = myOnClickListener;
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        private ImageButton btnPlay, btnPause;

        public MyViewHolder(View itemView) {
            super(itemView);

            // bind views

            btnPlay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = getAdapterPosition();

                    int prev = currentPlayingPosition;
                    currentPlayingPosition = position;

                    if (prev >= 0)
                        notifyItemChanged(prev);  // refresh previously playing view

                    notifyItemChanged(currentPlayingPosition);

                    mMyOnClickListener.playOnClick(v, position);
                }
            });

            btnPause.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = getAdapterPosition();
                    notifyItemChanged(position);
                    currentPlayingPosition = -1;
                    mMyOnClickListener.pauseOnClick(v, position);
                }
            });
        }
    }

    private interface MyOnClickListener {
        void playOnClick(View v, int position);

        void pauseOnClick(View v, int position);
    }
}

Answer 3

您可以将小部件作为参数传递给MyOnClickListener函数，如下所示：

MyOnClickListener.playOnClick(v, btnPlay, getAdapterPosition());

Answer 4

尝试类似这样的内容

 class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    private CardView oneway_card, CardView;
    private ImageView logo, arrow;
    private Context context;
    private List<Onwardflights> objectlist;

    private TextView arrival, departure, duration, amount, flightcode, arr_text, stops, stops_text;

    public ViewHolder(View itemView, Context context, List<Onwardflights> objectlist) {
        super(itemView);

        itemView.setOnClickListener(this);
        this.context = context;
        this.objectlist = objectlist;

*Initialize here*
logo = (ImageView) itemView.findViewById(R.id.oneway_logo);
            arrival = (TextView) itemView.findViewById(R.id.oneway_arrtime);

}

您的onclick方法

 @Override
    public void onClick(View view) {

        int position = getAdapterPosition();

        Log.i("Position", "Postion " + position + " is clicked");
        oneway_card.setCardBackgroundColor(Color.parseColor("#E0FFFF"));

        //your code

    }

如何在活动中处理recyclerview的项目视图？

4 个答案: