java - android recyclerview viewholder Mediaplayer处理点击问题

Question

我正在通过单击项目 View 来播放音频文件(MP3)，上一个文件会自动停止，但问题是在点击recyclerview的第3个项目后，第一个文件一个在点击时不播放声音，并且在列表中的其他一些点击上也发生了同样的问题。我已经添加了完整的适配器类

public class RingToneAdapter extends RecyclerView.Adapter<RingToneAdapter.RingToneViewHolder> {
       //removed declared varaible for the sake of post to edit
       static final int[] resID = {R.raw.a48, R.raw.funny_hen};

        public RingToneAdapter(Context rcntx, List<RingTone_Items> ringtonelist) {
            this.rcntx = rcntx;
            this.ringtonelist = ringtonelist;
        }

        @NonNull
        @Override
        public RingToneViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            view = LayoutInflater.from(rcntx).inflate(R.layout.ringtone_values, viewGroup, false);
            RingToneViewHolder ringToneViewHolder = new RingToneViewHolder(view);
            return ringToneViewHolder;
        }

        //playing sounds on recycler view

        @Override
        public void onBindViewHolder(@NonNull final RingToneViewHolder ringToneViewHolder, final int i) {
            final RingTone_Items ringTone_items = ringtonelist.get(i);
            ringToneViewHolder.rtv.setText(ringTone_items.getRintonetv());
            if (mSelectedItem == i) { 
                 ringToneViewHolder.iconplay.setImageResource(R.drawable.ic_pause_black_24dp);
            } else {
                ringToneViewHolder.iconplay.setImageResource(R.drawable.ic_play_arrow_black_24dp); 
            }

            ringToneViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {              
                    if (mp != null && mp.isPlaying()) {
                        mp.stop();
                        mp.reset();
                        mp = null;
                        ringToneViewHolder.iconplay.setImageResource(R.drawable.ic_play_arrow_black_24dp);

                    }
                    //Intent it = new Intent(rcntx, ViewPager_Data.class);
                    Intent it = new Intent(rcntx, AndroidViewPagerExample.class);
                    it.putExtra("POS",i);
                    it.putExtra("name",ringTone_items.getRintonetv());

                    rcntx.startActivity(it);
                }
            });
            ringToneViewHolder.iconplay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                   if (mSelectedItem == i) {
                        mSelectedItem = -1;
                       oldpossssssss = i;
                    } else {
                        mSelectedItem = i;
                    }
                    notifyDataSetChanged();
                    if (mp != null && mp.isPlaying()) {
                        mp.stop();
                        mp.reset();
                        mp = null;

                        if (oldpossssssss == i) {
                        } else {
                           mp = new MediaPlayer();
                           mp = MediaPlayer.create(rcntx, resID[i]);
                           mp.start();
                       }
                  } else {
                        mp = new MediaPlayer();
                        mp = MediaPlayer.create(rcntx, resID[i]);
                        mp.start();
                    }
                }
            });
        }

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

        class RingToneViewHolder extends RecyclerView.ViewHolder {
            private TextView rtv, hello, close;
            private ImageView iconplay;


            public RingToneViewHolder(@NonNull View itemView) {
                super(itemView);
                rtv = itemView.findViewById(R.id.ringtitle);
                iconplay = itemView.findViewById(R.id.playicon);

            }

        }

如何根据相应单击播放媒体文件来顺利管理此问题。我哪里做错了，请帮助我，谢谢。

Answer 1

我建议您在 viewHolders 中使用单音媒体播放器。首先，使用多个准备好的媒体播放器的内存效率不是很高。其次，它将允许您解决后台播放声音的问题，因为一个媒体播放器一次只能播放一个音频。