Android CardView使用自定义onItemSelectedListener删除多个选择

Question

我在选择多个CardView时遇到问题。问题出在这张照片

我希望它仅标记一个卡片视图，以便如果我按下另一个卡片视图，则前一个卡片将变为白色（单选）。所以基本上我希望它具有与单选按钮相同的行为。

我的适配器中onBindViewHolder的代码。我相信这是它无法进行单选的原因。

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    holder.txt_treatment_name.setText(treatmentList.get(position).getTreatmentName());
    holder.txt_treatment_price.setText(treatmentList.get(position).getTreatmentPrice());
    holder.txt_treatment_description.setText(treatmentList.get(position).getTreatmentDescription());

    if (cardViewList.contains(holder.card_treatment))
        cardViewList.add(holder.card_treatment);

    holder.setiRecyclerItemSelectedListener((view, pos) -> {
        // Set white background for all cards that aren't selected
        for (CardView cardView:cardViewList)
            cardView.setCardBackgroundColor(context.getColor(R.color.colorWhite)); //

        //Set background for selected item
        holder.card_treatment.setCardBackgroundColor(context.getColor(R.color.colorPrimaryLight));
        holder.txt_treatment_name.setTextColor(context.getColor(R.color.colorWhite));
        holder.txt_treatment_description.setTextColor(context.getColor(R.color.colorWhite));
        holder.txt_treatment_price.setTextColor(context.getColor(R.color.colorWhite));

        //Send broadcast to tell BookingActivity to enable Button NEXT
        Intent intent = new Intent(Common.KEY_ENABLE_BUTTON_NEXT);
        intent.putExtra(Common.KEY_TREATMENT, treatmentList.get(pos));
        localBroadcastManager.sendBroadcast(intent);
    });
}

以及我的具有自定义itemSelectedListener的ViewHolder的代码

static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    TextView txt_treatment_name, txt_treatment_price, txt_treatment_description;
    CardView card_treatment;
    IRecyclerItemSelectedListener iRecyclerItemSelectedListener;

    void setiRecyclerItemSelectedListener(IRecyclerItemSelectedListener iRecyclerItemSelectedListener) {
        this.iRecyclerItemSelectedListener = iRecyclerItemSelectedListener;
    }

    MyViewHolder(@NonNull View itemView) {
        super(itemView);

        txt_treatment_name = itemView.findViewById(R.id.txt_treatment);
        txt_treatment_price = itemView.findViewById(R.id.txt_price);
        txt_treatment_description = itemView.findViewById(R.id.txt_description);
        card_treatment = itemView.findViewById(R.id.card_treatment);

        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        iRecyclerItemSelectedListener.onItemSelectedListener(v, getAdapterPosition());
    }
}

[我遵循了youtube指南here，在他的示例中，它工作正常。我只是不知道如何在其中删除多个选择并实现“单选按钮”行为。

谢谢你！

Answer 1

在您的适配器中具有一个全局位置int，该位置保持单击的位置：

private int clickedPosition=-1;


//in onbindviewholder

if(clickedPosition==position){
//changed color

        holder.card_treatment.setCardBackgroundColor(context.getColor(R.color.colorPrimaryLight));

}else{

//white color

        holder.card_treatment.setCardBackgroundColor(context.getColor(R.color.White));


}


//when you click some item
holder.setiRecyclerItemSelectedListener((view, pos) -> {

//hold the clicked position and change color 
holder.card_treatment.setCardBackgroundColor(context.getColor(R.color.colorPrimaryLight));
clickedPosition = position;
this.notifyDataSetChanged();

});