Recyclerview滚动期间更改项目

Question

我有一个RecyclerView.每行都有一个播放按钮,textview和Progressbar.单击播放按钮时必须播放我的SD卡中的音频并且必须进度Progressbar问题是当我向下滚动recyclerview时,请更改下一行中的Progressbar.意思是我可以同时在屏幕上显示5个项目.当我滚动到第6行,第6行搜索栏突然改变.

public class ListAdapter extends RecyclerView.Adapter {

    private List<Historyitem> stethitems;
    public Context mContext;
    public Activity activity;
    public Handler mHandler;

    static MediaPlayer mPlayer;
    static Timer mTimer;

    public ListAdapter(Activity activity,Context mContext,List<Historyitem> stethitems) {
        this.stethitems = stethitems;
        this.mContext = mContext;
        this.activity = activity;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {

        View rootView = LayoutInflater.
                from(mContext).inflate(R.layout.stethoscopeadapteritem, null, false);
        RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
        rootView.setLayoutParams(lp);
        mHandler = new Handler();
        return new MyViewHolder(rootView);
    }

    @Override
    public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder, int position) {

        final Historyitem dataItem = stethitems.get(position);
        final MyViewHolder myViewHolder = (MyViewHolder) viewHolder;
        myViewHolder.progressplay.setProgress(0);
        myViewHolder.stethdatetime.setText(dataItem.getReported_Time());
        myViewHolder.stethhosname.setText(dataItem.getdiv());

        if(dataItem.getPatient_Attribute().replaceAll(" ","").equals("")){
            myViewHolder.stethdoctorname.setText(dataItem.getunit());
        } else {
            myViewHolder.stethdoctorname.setText(dataItem.getPatient_Attribute());
        }

        myViewHolder.stethstreamplay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                   FileDownload(dataItem.getmsg(),
                            myViewHolder.progressplay);

            }
        });
    }

    @Override
    public int getItemCount() {

        return stethitems.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {

        final CustomTextRegular stethdatetime;
        final CustomTextView stethhosname;
        final CustomTextBold stethdoctorname;
        final ImageButton stethstreamplay;
        final NumberProgressBar progressplay;

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

            stethdatetime = (CustomTextRegular)
                    itemView.findViewById(R.id.stethdatetime);
            stethhosname = (CustomTextView)
                    itemView.findViewById(R.id.stethhosname);
            stethdoctorname = (CustomTextBold)
                    itemView.findViewById(R.id.stethdoctorname);
            stethstreamplay = (ImageButton)
                    itemView.findViewById(R.id.stethstreamplay);
            progressplay= (NumberProgressBar)
                    itemView.findViewById(R.id.progressplay);


        }
    }
    public void  FileDownload(final String downloadpath,

                                     final NumberProgressBar progressplay) {

        new AsyncTask<NumberProgressBar, Integer, NumberProgressBar>() {
            NumberProgressBar progress;
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                try {
                    if(mPlayer!=null){
                        mPlayer.stop();
                    }
                }catch (Exception e){
                }
                try {
                    if(mTimer != null){
                        mTimer.purge();
                        mTimer.cancel();
                    }
                }catch (Exception e){
                }
            }

            @Override
            protected NumberProgressBar doInBackground(NumberProgressBar... params) {
                int count;
                progress = progressplay;
                try {

                    final List<NameValuePair> list = new ArrayList<NameValuePair>();
                    list.add(new BasicNameValuePair("pid",id));

                    URL url = new URL(Config.requestfiledownload + "?path=" +
                            downloadpath);
                    URLConnection connection = url.openConnection();
                    connection.connect();

                    int lenghtOfFile = connection.getContentLength();
                    // download the file
                    InputStream input = new BufferedInputStream(url.openStream());
                    OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() +
                            "record.wav");
                    byte data[] = new byte[1024];
                    long total = 0;
                    while ((count = input.read(data)) != -1) {
                        total += count;
                        // publishing the progress....
                        publishProgress((int) (total * 100 / lenghtOfFile));
                        output.write(data, 0, count);
                    }
                    output.flush();
                    output.close();
                    input.close();
                } catch (Exception e) {

                }
                return progress;
            }
            @Override
            protected void onPostExecute(final NumberProgressBar numberProgressBar) {
                super.onPostExecute(numberProgressBar);

                        try {
                            StartMediaPlayer(numberProgressBar);
                        } catch (Exception e){
                            e.printStackTrace();
                        }

            }
        }.execute();
    }

    public void StartMediaPlayer(final NumberProgressBar progressbar){
        Uri playuri = Uri.parse("file:///sdcard/record.wav");
        mPlayer = new MediaPlayer();
        mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mPlayer.reset();
        try {
            mPlayer.setDataSource(mContext, playuri);
        } catch (IllegalArgumentException e) {

        } catch (SecurityException e) {

        } catch (IllegalStateException e) {

        } catch (Exception e) {

        }
        try {
            mPlayer.prepare();
        } catch (Exception e) {

        }

        mPlayer.start();
        progressbar.setMax(mPlayer.getDuration());
        mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                if(mPlayer!=null) {
                    mPlayer.release();
                    progressbar.setProgress(0);
                }
                if(mTimer != null){
                    mTimer.purge();
                    mTimer.cancel();
                }
            }
        });
        mTimer = new Timer();
        mTimer.schedule(new TimerTask() {
            @Override
            public void run() {
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        progressbar.setProgress(mPlayer.getCurrentPosition());
                    }
                });
            }
        },0,500);
    }}

Answer 1

请试试这个

1. 如果您正在使用ListView- 覆盖以下方法.

   @Override
   public int getViewTypeCount() {    
       return getCount();
   }
   
   @Override
   public int getItemViewType(int position) {    
       return position;
   }
   

2. 如果您正在使用RecycyclerView- 仅覆盖getItemViewType()方法.

   @Override
   public int getItemViewType(int position) {    
       return position;
   }
   

Answer 2

添加setHasStableIds(true);适配器构造函数并在适配器中覆盖这两个方法.

@Override
public long getItemId(int position) {
            return position;
}

@Override
public int getItemViewType(int position) {
       return position;
}

Answer 3

顾名思义,RecyclerView当您向下滚动时,a 中的视图将被回收.这意味着您需要保持支持模型中每个项目的状态,在这种情况下将是一个Historyitem,并在您的onBindViewHolder.

1)创建位置,最大值以及保存ProgressBar模型状态所需的任何其他变量.

2)ProgressBar根据背景模型中的数据设置您的状态; 单击时,将项目的位置传递给FileDownload/ StartMediaPlayermethods.

public void onBindViewHolder(final RecyclerView.ViewHolder viewHolder, int position) {
    final Historyitem dataItem = stethitems.get(position);
    final MyViewHolder myViewHolder = (MyViewHolder) viewHolder;
    myViewHolder.progressplay.setMax(dataItem.getMax());
    myViewHolder.progressplay.setProgress(dataItem.getPosition());
    ...
    myViewHolder.stethstreamplay.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
               FileDownload(dataItem.getmsg(), position);
        }
    });

3)通过更新支持模型并通知其已更改来更新进度条.

stethitems.get(position).setPosition(mPlayer.getCurrentPosition());
notifyItemChanged(position);

Answer 4

recyclerview.setItemViewCacheSize(YourList.size());

Answer 5

我在尝试实现一个recyclerview时遇到了同样的问题，该视图包含一个edittex和一个复选框作为行元素。我只是通过在适配器类中添加以下两行来解决滚动值更改问题。

@Override
public long getItemId(int position) {
    return position;
}

@Override
public int getItemViewType(int position) {
    return position;
}

我希望这将是一个可能的解决方案。谢谢

Answer 6

如果您的 recyclerview ViewHolder 具有更多逻辑或具有不同的视图，那么您应该尝试：

 **order_recyclerView.setItemViewCacheSize(x);**

其中 x 是列表的大小。以上对我有用，希望对你也有用。