Question

我正在开发一款具有投票功能的应用。在民意调查中，有多种选择。选项可以是3,4,5等，用户只能选择一个选项。

我有自定义类的回收站视图，它有一个复选框和textview。问题是：

用户现在可以选择多个选项。

我想通过选择其他单选按钮来更改选择。

这是我的回收者视图代码

public class Poll_Options_recyclerView_Adapter extends RecyclerView.Adapter<Poll_Options_recyclerView_Adapter.MyViewHolder> {
public List<Poll_Option_Result> result = new ArrayList<>();
Context mycontext;

private int mCheckedPostion = -1; public Poll_Options_recyclerView_Adapter（列表结果，上下文上下文）{ this.result =结果; this.mycontext = context; }

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.custom_option_rec_list, parent, false);

    return new MyViewHolder(itemView, mycontext, result);
}

public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
      TextView poll_option;
    CheckBox checkBox;
    List<Poll_Option_Result> result_List = new ArrayList<>();
    Context mycontext;

    public MyViewHolder(View itemView, Context mycontext, List<Poll_Option_Result> result_List) {
        super(itemView);
        this.result_List = result_List;
        this.mycontext = mycontext;
        poll_option = (TextView) itemView.findViewById(R.id.optionA);
        checkBox=(CheckBox)itemView.findViewById(R.id.check_box);
        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
    }
}
@Override
public void onBindViewHolder(Poll_Options_recyclerView_Adapter.MyViewHolder holder, int position) {
    final Poll_Option_Result ResultList = result.get(position);
    holder.poll_option.setText(ResultList.getOption());

}

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

}

编辑：通过将此代码添加到onBindView来解决问题

@Override
public void onBindViewHolder(final Poll_Options_recyclerView_Adapter.MyViewHolder holder, final int position) {
    final Poll_Option_Result ResultList = result.get(position);
    holder.poll_option.setText(ResultList.getOption());

    //check checkbox and uncheck previous selected button
    holder.checkBox.setChecked(position == mCheckedPostion);
    holder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (position == mCheckedPostion) {
                holder.checkBox.setChecked(false);
                StringGen.username = "";
                mCheckedPostion = -1;
            } else {
                mCheckedPostion = position;
                StringGen.username = holder.poll_option.getText().toString();
                Toast.makeText(mycontext, "select : "+position+holder.poll_option.getText(), Toast.LENGTH_SHORT).show();
                notifyDataSetChanged();
            }
        }
    });


}

Answer 1

如果您希望将单选按钮作为回收站视图项的一部分，则可以在回收器视图适配器中记住上次选择的项目的位置，并在选择下一项时取消设置。

这样的东西，最简单的方法：

class MyAdapter : RecyclerView.Adapter<MyAdapter.MyViewHolder>() {

var items: MutableList<Item> = mutableListOf()

private var lastPos: Int? = null
private var checkBox: CheckBox? = null

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder =
        MyViewHolder(createHolderView(parent, R.layout.item))

override fun getItemCount(): Int = items.size

override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
    val item = items[position]
    holder.bind(item)

    holder.itemView.checkbox.setOnCheckedChangeListener { view, isChecked ->
        if (isChecked) {
            if (lastPos != null) {
                checkBox?.isChecked = false
            }
            lastPos = holder.adapterPosition
            checkBox = view as CheckBox
        }
    }
}

private fun createHolderView(parent: ViewGroup, @LayoutRes itemLayoutId: Int): View =
        LayoutInflater.from(parent.context).inflate(itemLayoutId, parent, false)


class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    fun bind(item: Item) {
        itemView.txtTitle.text = item.name
    }
}

我使用复选框而不是radiobutton，我认为它运作良好。和项目布局：

<CheckBox
    android:id="@+id/checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

<TextView
    android:id="@+id/txtTitle"
    tools:text="Title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

希望它有所帮助。

如何在回收站视图中显示无线电组中的多个选项

1 个答案: