在recyclerview中只选择一个radiobutton

Question

我有一个recyclerview,其中每个项目都有3个radiobuttons组合在一个radiogroup.现在,用户只能在recyclerview中为每个项目选择一个radiobutton.但我希望用户在整个Recyclerview中只选择一个radiobutton.怎么能实现这一目标？

这是它目前的样子.

我想在整个回收站视图中只检查1个radiobutton.如果选中第一项中的第一个单选按钮,之后用户点击第二项中的第二个单选按钮,则第一项中的第一个单选按钮应取消选中.

Answer 1

这是另一种方法.这比我以前的答案更优雅.但我保留了两个,因为之前的答案提供了更多的灵活性.

private RadioButton lastCheckedRB = null;
...
@Override
public void onBindViewHolder(final CoachListViewHolder holder, final int position) {
   holder.priceRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            RadioButton checked_rb = (RadioButton) group.findViewById(checkedId);
            if (lastCheckedRB != null) {
                lastCheckedRB.setChecked(false);
            }
            //store the clicked radiobutton
            lastCheckedRB = checked_rb;
        }
    });

Answer 2

这对我有用:

 private RadioButton lastCheckedRB = null;
 ...
 @Override
 public void onBindViewHolder(final CoachListViewHolder holder, final int position) {
  View.OnClickListener rbClick = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            RadioButton checked_rb = (RadioButton) v;
            if(lastCheckedRB != null){
                lastCheckedRB.setChecked(false);
            }
            lastCheckedRB = checked_rb;
        }
    };

    //price_1m, price3m, price_6m are RadioButtons inside a radiogroup
    holder.price1m.setOnClickListener(rbClick);
    holder.price3m.setOnClickListener(rbClick);
    holder.price6m.setOnClickListener(rbClick);

这里,单选按钮临时存储在lastCheckedRB中.单击新的单选按钮时,将取消选中旧的单选按钮.最初,lastCheckedRB设置为null.

Answer 3

我使用了这种方法

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

    private List<OffersModel> offersList;
    private Context context;

    private int lastSelectedPosition = -1;

    public OffersRecyclerViewAdapter(List<OffersModel> offersListIn, Context ctx) {
        offersList = offersListIn;
        context = ctx;
    }

    @Override
    public OffersRecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.offer_item, parent, false);

        OffersRecyclerViewAdapter.ViewHolder viewHolder =
                new OffersRecyclerViewAdapter.ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(OffersRecyclerViewAdapter.ViewHolder holder, int position) {

        //since only one radio button is allowed to be selected,
        // this condition un-checks previous selections
        holder.selectionState.setChecked(lastSelectedPosition == position);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {

        public RadioButton selectionState;

        public ViewHolder(View view) {
            super(view);

         selectionState = (RadioButton) view.findViewById(R.id.offer_select);

            selectionState.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    lastSelectedPosition = getAdapterPosition();
                    notifyDataSetChanged();

                }
            });
        }
    }
}