Question

首先忽略一些文字不在engilsh.Well我试图在按下时改变mi卡的颜色。结果是卡改变了颜色，问题是其他一些卡也会改变颜色。

我正在使用spareBoleanArray - ＆gt;选择

这是我的适配器：

private class DotesAdapter extends RecyclerView.Adapter<DotesAdapter.DoteViewHolder> implements Filterable {

    private ListaDotes mValues;
    private DotesAdapter.DoteFilter mFilter;



    public  DotesAdapter(ListaDotes items){
        mValues=items;
        mFilter= new DotesAdapter.DoteFilter(DotesAdapter.this);


    }

    @Override
    public DotesAdapter.DoteViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card,parent,false);
        return new DotesAdapter.DoteViewHolder(v);
    }

    @Override
    public void onBindViewHolder(DotesAdapter.DoteViewHolder holder, int position) {

        holder.Titulo.setText(mValues.get(position).getTitulo());

        String s;
        int t = mValues.get(position).getTipo();
        if(t==0)
            s= "GENERALES";
        else
        if(t==1)s= "FORTALEZA";
        else
        if(t==2)s= "REFLEJOS";
        else
        if(t==3)s= "VOLUNTAD";
        else
        if(t==4)s= "PRECISIÓN";
        else
        if(t==5)s= "ATAQUE";
        else
            s= "SOBRENATURALES";

        holder.Tipo.setText(s);



         if(selections.get(position,false))
           holder.myBackground.setCardBackgroundColor(Color.RED);



    }

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

    @Override
    public Filter getFilter() {
        // if(doteFilter == null)
        //   doteFilter = new DoteFilter(this, listaDotes);
        return mFilter;
    }

这是我的ViewHolder：

public   class DoteViewHolder extends RecyclerView.ViewHolder {

        TextView Titulo;
        TextView  Tipo;

        CardView myBackground;
        DotesAdapter adapter;

        public DoteViewHolder(final View itemView) {
            super(itemView);
            Titulo=(TextView) itemView.findViewById(R.id.titulo);
            Tipo=(TextView) itemView.findViewById(R.id.tipo);

            myBackground =(CardView) itemView.findViewById(R.id.card);


            itemView.setLongClickable(true);
            itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {


                    Intent intent = new Intent(CrearPersonajeDotes.this,DoteView.class);
                    //Bundle b = new Bundle();
                    //b=filteredList.get(getAdapterPosition()).toString();
                    YoYo.with(Techniques.Flash).duration(200).playOn(v);
                    intent.putExtra("Dote", getAdapterPosition());
                    intent.putExtra("Call",1);
                    startActivity(intent);
                    return true;
                }
            });

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
//HERE I CHANGE THE COLOR OF THE CARD TO RED IF THE POSITION OF THE ARRAYS IS ON TRUE OR BLUE IN THE OTHER CASE
                    if(!selections.get(getAdapterPosition(),false)) {

                        myBackground.setCardBackgroundColor(Color.RED);
                        selections.put(getAdapterPosition(),true);
                        Dote d = listaDotes.get(getAdapterPosition());
                        MainCrearPersonaje.NPersonaje.addDote(d);
                        UpdatePDText();


                    }

                    else{

                        myBackground.setCardBackgroundColor(Color.BLUE);
                        selections.put(getAdapterPosition(),false);
                        Dote d = listaDotes.get(getAdapterPosition());
                        MainCrearPersonaje.NPersonaje.removeDote(d);
                        UpdatePDText();


                        ;


                    }

                }
            });
        }
    }

Answer 1

//this line contains a logical error. it will evaluate to false when it 
//actually true...remove the ! and it should work fine
if(!selections.get(getAdapterPosition(),false))

Answer 2

您需要onBindViewHolder()中的代码来设置颜色。当视图被回收时，它仍然具有上次使用时的颜色，因此在将新数据绑定到颜色时需要正确地重置颜色。

int color = selections.get(position,false) ? Color.RED : Color.BLUE;
holder.myBackground.setBackgroundColor(color);

使用CardView在RecyclerView上设置setCardBackgroundColor

2 个答案: