滚动 Recycler View 时有意丢失数据

Question

我正在尝试将一些文本从 Recycler View 发送到另一个 Activity，并且当屏幕没有滚动到底部时它可以正常工作。 但是当我向下滚动时，Intent 中的一些数据会丢失。当我向上滚动并单击按钮时，不会发生这种情况。

收藏按钮代码来自here.

我的适配器代码：

public class AdapterLanches extends RecyclerView.Adapter<AdapterLanches.MyViewHolder> implements Filterable {

public static MaterialFavoriteButton favoriteButton;
private List<Lanches> listaLanches;
private List<Lanches> listaLanchesCompleta;
public static Lanches itemAtual;
ArrayList<CharSequence> favoritos;
boolean fav = false;

int estadoPrograma;
public Button lc,fit;

int posicao = -1;

public class MyViewHolder extends RecyclerView.ViewHolder {

    public MaterialFavoriteButton favoriteButton;
    TextView titulo;
    RecyclerView recyclerView;


    public MyViewHolder(@NonNull View itemView) {
        super(itemView);
        lc = itemView.findViewById(R.id.lc);
        fit = itemView.findViewById(R.id.fit);
        favoriteButton = itemView.findViewById(R.id.favorite);

        favoriteButton.setOnFavoriteChangeListener(new MaterialFavoriteButton.OnFavoriteChangeListener() {
            @Override
            public void onFavoriteChanged(MaterialFavoriteButton buttonView, boolean favorite) {
               final int posicao = getAdapterPosition();
                fav = favorite;
                favoritos.add(listaLanchesCompleta.get(posicao).getTitulo());
                VeganoActivity.intentLanches2.putExtra("titulo", favoritos);
                System.out.println(favoritos);

            }
        });

        titulo = itemView.findViewById(R.id.textnomeLanchesId);
        favoritos = new ArrayList<>();

    }
}


public AdapterLanches(List<Lanches> listaLanches) {


    this.listaLanches = listaLanches;
    listaLanchesCompleta = new ArrayList<>(this.listaLanches);

}

@Override
public Filter getFilter() {
    return lanchesFilter;
}

public Filter lanchesFilter = new Filter() {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        List<Lanches> filteredList = new ArrayList<>();
        if (constraint == null || constraint.length() == 0){
            filteredList.addAll(listaLanchesCompleta);
        }else{
            estadoPrograma = 1;
            String filterPattern = constraint.toString().toLowerCase().trim();

            for ( Lanches item : listaLanchesCompleta){
                if (item.getTitulo().toLowerCase().contains(filterPattern)){
                    filteredList.add(item);
                }
            }
        }
        FilterResults results = new FilterResults();
        results.values = filteredList;
        results.count = filteredList.size();

        return results;
    }

    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        listaLanches.clear();
        listaLanches.addAll((ArrayList<Lanches>)results.values);
        notifyDataSetChanged();
    }
};


@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View itemListaLanches = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_lanches, parent, false);
    final MyViewHolder holder = new MyViewHolder(itemListaLanches);




    return holder;
}

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

    itemAtual = listaLanches.get(position);
    holder.titulo.setText(itemAtual.getTitulo());


    if (itemAtual.getId() == 0){
        fit.setVisibility(View.GONE);
        lc.setVisibility(View.GONE);
    }

    if (itemAtual.getId() == 1){
        lc.setVisibility(View.VISIBLE);
        fit.setVisibility(View.GONE);
    }

    if (itemAtual.getId() == 2){
        fit.setVisibility(View.VISIBLE);
        lc.setVisibility(View.GONE);
    }


}


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

@Override
public int getItemCount() {

    return listaLanches.size();
}

}

欢迎任何帮助，谢谢。

Answer 1

创建一个列表，为这些数据提供更广泛的范围。因为 RecyclerView 会在它们消失时擦除它们。

var stuffINeedToKeep=mutableListOf<String>()//this goes right under the class constructor so that it has wide scope
...
heart.setOnClickListener({
stuffINeedToKeep.add(dataFromViewHolder)
})