如何为 Recyclerview 中未选中的项目设置背景颜色和文本颜色？

Question

我正在使用 RecyclerView。在我的 RecyclerView 项目中，我使用的是一个按钮视图。下面是我的 RecyclerView 项目布局，

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <Button
        android:id="@+id/cost_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
         />


</androidx.constraintlayout.widget.ConstraintLayout>

下面是我的适配器 class,

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private List<Plan> plans;
    private MyInterface myInterface;
    private int index=-1;
    public RecyclerViewAdapter(List<Plan> planList, MyInterface myInterfaceListener) {
        this.plans =planList;
        this.myInterface=myInterfaceListener;
    }

   interface MyInterface{
        public void getId(String id);
   }

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

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        MyViewHolder myViewHolder=(MyViewHolder) holder;
        myViewHolder.costButton.setText(plans.get(position).getAmount());
        if(index==-1) {
            if(plans.get(0).getAmount().equalsIgnoreCase(plans.get(position).getAmount())) {
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
            }
            else{
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
            }
        }
        myViewHolder.costButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                index=position;
                if(index==position){
                    myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
                    myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
                }
                else{
                    myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
                    myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
                }
            }
        });


    }

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

    private class MyViewHolder extends RecyclerView.ViewHolder{
        private Button costButton;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            costButton=itemView.findViewById(R.id.cost_button);

        }
    }

}

我可以为所选项目设置背景颜色和文本颜色。我的问题是，考虑有 4 个按钮。如果单击按钮 1，则可以更改颜色。之后，我单击按钮 2。此时，单击项目的颜色更改以及按钮 1 的颜色更改也保持不变。这是我的问题。任何人都可以帮助我。

Answer 1

您可以使用复选框代替按钮，并根据您的需要进行自定义。

Answer 2

将您的代码片段更改为：

public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        MyViewHolder myViewHolder=(MyViewHolder) holder;
        myViewHolder.costButton.setText(plans.get(position).getAmount());
        if(index==-1) {
            if(plans.get(0).getAmount().equalsIgnoreCase(plans.get(position).getAmount())) {
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
            }
            else{
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
            }
        }else{
            if(index==position){
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
            }
            else{
                myViewHolder.costButton.setBackgroundColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.color_white));
                myViewHolder.costButton.setTextColor(myViewHolder.itemView.getContext().getResources().getColor(R.color.blue));
            }
        }
        myViewHolder.costButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                index=position;
               notifyDataSetChanged();
            }
        });


    }

如何为 Recyclerview 中未选中的项目设置背景颜色和文本颜色？

How to set Background color and text color for unselected item in Recyclerview?

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