notifyDataSetChanged不刷新RecyclerView

Question

I have a weird problem. I switched to RecyclerView from ListView and I can't refresh or notify of change in my ListView . I tried calling Item.this.notifyDataSetChanged(); and other methods to refresh View but it doesn't work. Instead RecyclerView is refreshed when I scroll(regardless of direction). How can I notify my RecyclerView when there is a change?

CODE:

@Override
public void onBindViewHolder(Ids holder, final int position) {
    rowItemClass = (ListViewRow) rowItems.get(position);
    Log.e("swag", "OYOYOYOYOYO");
    if (Globals.isPlaying && Globals.pos == position) {

        if (pausedSamePos == true) {
            holder.pauseed_play.setVisibility(View.VISIBLE);
            holder.playing_pause.setVisibility(View.GONE);
        } else {
            holder.pauseed_play.setVisibility(View.GONE);
            holder.playing_pause.setVisibility(View.VISIBLE);
        }
        holder.song_currenttime_sb.setActive();
        holder.song_duration.setVisibility(View.INVISIBLE);
        holder.song_duration_sb.setVisibility(View.VISIBLE);
        holder.seekbar.setActive();

    } else {
        holder.seekbar.setInactive();
        holder.song_currenttime_sb.setInactive();
        holder.song_icon.setImageResource(rowItemClass.getImageId());
        holder.song_duration_sb.setVisibility(View.INVISIBLE);
        holder.song_duration.setVisibility(View.VISIBLE);
        holder.pauseed_play.setVisibility(View.GONE);
        holder.playing_pause.setVisibility(View.GONE);

    }
    sharedPreference = new SharedPreference();

    holder.song_duration.setTypeface(Globals
            .getTypefaceSecondary(context));
    holder.song_duration_sb.setTypeface(Globals
            .getTypefaceSecondary(context));
    holder.song_name.setTypeface(Globals.getTypefacePrimary(context));
    holder.song_currenttime_sb.setTypeface(Globals
            .getTypefaceSecondary(context));

    holder.song_name.setText(rowItemClass.getTitle());
    holder.song_duration.setText(rowItemClass.getDesc());

    holder.song_duration_sb.setText(rowItemClass.getDesc());
    holder.favorite.setTag(position);
    holder.song_currenttime_sb.setTag(position);
    holder.seekbar.setTag(position);
    holder.clickRegister.setTag(position);
    holder.song_icon.setTag(position);
    holder.song_name.setTag(position);
    holder.song_duration.setTag(position);
    holder.song_duration_sb.setTag(position);
    holder.more_options.setTag(position);
    // int task_id = (Integer) holder.seekbar.getTag();
    final Ids finalHolder = holder;





    holder.clickRegister.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            try {

                if ((Globals.isPlaying.booleanValue())
                        && (Globals.pos == position)) {
                    pausePlaying();

                } else {

                    Globals.stopPlaying();
                    pausedSamePos = false;
                    Globals.pos = position;
                    Globals.isPlaying = true;
                    Item.this.notifyDataSetChanged();

                    Globals.mp = MediaPlayer.create(context, Integer
                            .valueOf(Item.this.songPos[position])
                            .intValue());
                    Globals.mp.start();
                    Globals.pos = position;

                    Globals.isPlaying = Boolean.valueOf(true);
                    Item.this.notifyDataSetChanged();

                    Globals.mp
                            .setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                                @Override
                                public void onCompletion(
                                        MediaPlayer mpOnComplete) {
                                    mpOnComplete.release();

                                    Globals.isPlaying = false;
                                    pausedSamePos = false;
                                    Globals.isPlaying = Boolean
                                            .valueOf(false);
                                    finalHolder.menu_options
                                            .startAnimation(new ViewExpandAnimation(
                                                    finalHolder.menu_options));
                                    Item.this.notifyDataSetChanged();
                                }
                            });

                }
            } catch (Exception localException) {
            }

        }
    });

    holder.clickRegister
            .setOnLongClickListener(new View.OnLongClickListener() {

                @Override
                public boolean onLongClick(View v) {
                    Globals.stopPlaying();
                    Item.this.notifyDataSetChanged();
                    return true;
                }
            });




}

Answer 1

I've been struggling hard with a similar issue, trying to handle a use-case where all of the adapter's content has to be replaced and the recycler-view should start from scratch : calling notifyDataSetChanged() , swapAdapter() with numerous combinations of subsequent calls to view/layout-manager invalidation requests resulted in nothing but a (seemingly) empty recycler-view. The view didn't even try to rebind the view holders.

What seemed to have worked it out is this hack-ish fix:

view.swapAdapter(sameAdapter, true);
view.scrollBy(0, 0);

As it turns out, scrollBy (even with 0 offsets) drives the recycler-view into laying out its views and executing the pending view-holders rebinding.

Answer 2

if you want notify your recycleListView just simple call notifyDataSetChanged(); in your class adapter. this is my method in my adapter class :

public class ListAdapter extends RecyclerView.Adapter<Listdapter.ViewHolder> {
....
private List<DesaObject> desaObjects= new ArrayList<DesaObject>();

public void setListObjects(List<DesaObject> desaObjects){
        if(this.desaObjects.size()>0)
            this.desaObjects.clear();
        this.desaObjects = desaObjects;
        notifyDataSetChanged();
    }
....

public static class ViewHolder extends RecyclerView.ViewHolder {
       public final View mView;
       public final AppCompatTextView desa;


       public ViewHolder(View view) {
           super(view);
           mView = view;
           desa = (AppCompatTextView) view.findViewById(R.id.desa);
       }

   }
}

in your code you dont actually set or change your listObjects in the OnClickListener and please try notifyDataSetChanged(); instead of Item.this.notifyDataSetChanged();

Answer 3

I am not sure why is this, but notifyDataSetChanged(); didn't work. So I tried keeping track of changed items and refreshing them manually with notifyItemChanged(int); and so far it seems to be working. I am still not sure why refreshing whole RecyclerView didn't work.

Answer 4

Initialize your Adapter Again with changed data and use method 'swapadapter'. hope it helps.