RecyclerView選中更換背景顔色和字型效果實作

效果實作主要是通過在adapter裡面定義一個位置的變量selectedPosition,并且設定item點選事件，通過回調接口的形式，在回調方法裡指派selectedPosition,然後重新整理RecyclerView.

關鍵代碼如下

adapter中

public class EMGoodsRvAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {


    private Context context;
    List<GetEMGoods.ContentBean> rowsBeans;
    private OnMyItemClickListener myItemClickListener;

    public interface OnMyItemClickListener {
        void onItemClick(String id, String name, int positon);
    }

    public void setMyItemClickListener(OnMyItemClickListener myItemClickListener) {
        this.myItemClickListener = myItemClickListener;
    }

    public EMGoodsRvAdapter(Context context, List<GetEMGoods.ContentBean> rowsBeans) {
        this.context = context;
        this.rowsBeans = rowsBeans;
    }

    private int selectPosition;

    public int getSelectPosition() {
        return selectPosition;
    }

    public void setSelectPosition(int selectPosition) {
        this.selectPosition = selectPosition;
    }

    public class ItemViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.tv1)
        TextView tv1;

        public ItemViewHolder(@NonNull View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (myItemClickListener != null) {
                        myItemClickListener.onItemClick(rowsBeans.get(getAdapterPosition()).getId(), rowsBeans.get(getAdapterPosition()).getName(), getAdapterPosition());
                    }
                }
            });


        }

        public void bind() {
            tv1.setText(rowsBeans.get(getAdapterPosition()).getName());
            if (getAdapterPosition() == getSelectPosition()) {
                tv1.setBackgroundColor(context.getResources().getColor(R.color.bk_blue));
                tv1.setTextColor(context.getResources().getColor(R.color.white));
            } else {
                tv1.setBackgroundColor(context.getResources().getColor(R.color.white));
                tv1.setTextColor(context.getResources().getColor(R.color.black));
            }
        }
    }


    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.emgood_item, parent, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        ((ItemViewHolder) holder).bind();
    }

    @Override
    public int getItemCount() {
        return rowsBeans != null ? rowsBeans.size() : 0;
    }

}
           

activity中

adapter.setMyItemClickListener(new EMGoodsRvAdapter.OnMyItemClickListener() {
            @Override
            public void onItemClick(String id, String name, int position) {
                adapter.setSelectPosition(position);
                adapter.notifyDataSetChanged();
            }
        });