android - 允许用户在 Recyclerview Android 中仅选择 1 项

Question

您好，我有一个 RecycleView 和一个带有 CheckBox 的适配器，允许用户在 Recycle View 中选择多个项目(选中的项目将存储在 ArrayList 中)现在我想要添加另一个功能，允许用户在回收 View 中仅选择 1 个项目(仅选中 1 个复选框)(用户可以自由更改选择)。如何实现这一点。非常感谢任何帮助

这是我的 apdater(用于选择多个项目)(我想修改或添加另一个 adpater 以允许用户只选择 1 个项目，一次只选中 1 个复选框)

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

private Context context;
List <Event> events, eventSelected;

public EventAdapterAssign(Context context, List<Event> events, List<Event> eventSelected) {
    this.context = context;
    this.events = events;
    this.eventSelected = eventSelected;
}


@Override
public EventAdapterAssign.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    Context context = parent.getContext();
    LayoutInflater inflater = LayoutInflater.from(context);

    // Inflate the custom layout
    View eventView1 = inflater.inflate(R.layout.event_list_assign, parent, false);

    // Return a new holder instance
    ViewHolder viewHolder = new ViewHolder(eventView1);
    return viewHolder;
}

@Override
public void onBindViewHolder(EventAdapterAssign.ViewHolder holder, int position) {
    //Getting the particular item from the list
    final Event event = events.get(position);

    //Showing data on the views
    holder.EventTitle.setHint(event.getEventTitle());
    holder.EventDesc.setText(event.getEventDesc());
    holder.EventStartTime.setText(event.getEventStartTime());
    holder.EventEndTime.setText(event.getEventEndTime());
    holder.EventID.setText(event.getEventID());

    //in some case, it will prevent unwanted situations;
    holder.selectCheckBox.setOnCheckedChangeListener(null);

    //if true, your check box will be selected, else unselected
    holder.selectCheckBox.setChecked(event.isSelected());

    holder.selectCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            event.setIsSelected(isChecked);
            if (isChecked) {
                eventSelected.add(event);
            } else {
                eventSelected.remove(event);
            }
        }
    });

}

// Return the total count of items
@Override
public int getItemCount() {
    return events.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {
    //View
    public EditText EventTitle;
    public TextView EventDesc;
    public TextView EventStartTime;
    public TextView EventEndTime;
    public TextView EventID;
    public CheckBox selectCheckBox;

    //initiating View
    public ViewHolder(View itemView) {
        super(itemView);

        // display Check In event when beacon in range

        EventTitle = (EditText)itemView.findViewById(R.id.EventTitle);
        EventDesc = (TextView)itemView.findViewById(R.id.EventDesc);
        EventStartTime = (TextView)itemView.findViewById(R.id.EventStartTime);
        EventEndTime = (TextView)itemView.findViewById(R.id.EventEndTime);
        EventID = (TextView)itemView.findViewById(R.id.EventID);

        selectCheckBox = (CheckBox)itemView.findViewById(R.id.selectCheckBox);

    }
}

这是我的数据模型(事件)类

public class Event implements Parcelable {
    private String EventID;
    private String EventDesc;
    private String EventTitle;
    private String EventStartTime;
    private String EventEndTime;

    private Context context;
    private boolean isSelected;

    public boolean isSelected() {
        return isSelected;
    }

    public void setIsSelected(boolean isSelected) {
        this.isSelected = isSelected;
    }

    public String getEventID() {
        return EventID;
    }

    public void setEventID(String eventID) {
        EventID = eventID;
    }

    public String getEventDesc() {
        return EventDesc;
    }

    public void setEventDesc(String eventDesc) {
        EventDesc = eventDesc;
    }

    public String getEventTitle() {
        return EventTitle;
    }

    public void setEventTitle(String eventTitle) {
        EventTitle = eventTitle;
    }

    public String getEventStartTime() {
        return EventStartTime;
    }

    public void setEventStartTime(String eventStartTime) {
        EventStartTime = eventStartTime;
    }

    public String getEventEndTime() {
        return EventEndTime;
    }

    public void setEventEndTime(String eventEndTime) {
        EventEndTime = eventEndTime;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.EventID);
        dest.writeString(this.EventDesc);
        dest.writeString(this.EventTitle);
        dest.writeString(this.EventStartTime);
        dest.writeString(this.EventEndTime);
    }

    public Event() {
    }

    protected Event(Parcel in) {
        this.EventID = in.readString();
        this.EventDesc = in.readString();
        this.EventTitle = in.readString();
        this.EventStartTime = in.readString();
        this.EventEndTime = in.readString();
    }

    public static final Parcelable.Creator<Event> CREATOR = new Parcelable.Creator<Event>() {
        public Event createFromParcel(Parcel source) {
            return new Event(source);
        }

        public Event[] newArray(int size) {
            return new Event[size];
        }
    };


}

Answer 1

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

     private Context context;
            List <Event> events, eventSelected;
                private SparseBooleanArray mSparseBooleanArray;
        public  int selectedPosition;
            public EventAdapterAssign(Context context, List<Event> events, List<Event> eventSelected) {
                this.context = context;
                this.events = events;
                this.eventSelected = eventSelected;
        mSparseBooleanArray = new SparseBooleanArray();    
        }


            @Override
            public EventAdapterAssign.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                Context context = parent.getContext();
                LayoutInflater inflater = LayoutInflater.from(context);

                // Inflate the custom layout
                View eventView1 = inflater.inflate(R.layout.event_list_assign, parent, false);

                // Return a new holder instance
                ViewHolder viewHolder = new ViewHolder(eventView1);
                return viewHolder;
            }

            @Override
            public void onBindViewHolder(EventAdapterAssign.ViewHolder holder, int position) {
                //Getting the particular item from the list
                 Event event = events.get(position);

                //Showing data on the views
                holder.EventTitle.setHint(event.getEventTitle());
                holder.EventDesc.setText(event.getEventDesc());
                holder.EventStartTime.setText(event.getEventStartTime());
                holder.EventEndTime.setText(event.getEventEndTime());
                holder.EventID.setText(event.getEventID());

                //in some case, it will prevent unwanted situations;
                holder.selectCheckBox.setOnCheckedChangeListener(null);

                //if true, your check box will be selected, else unselected

            holder.selectCheckBox.setTag(position);

            if(position==selectedPosition)
            {
            holder.selectCheckBox.setChecked(true);
            }
            else
            {
            holder.selectCheckBox.setChecked(false);
            }
                holder.selectCheckBox.setOnCheckedChangeListener(new CheckListener(holder.selectCheckBox,position));

            }

            // Return the total count of items
            @Override
            public int getItemCount() {
                return events.size();
            }

            class CheckListener implements OnCheckedChangeListener {

                    private CheckBox checkbox;
            Event data;
                    public CheckListener(CheckBox checkbox,int position) {

                        this.checkbox = checkbox;
                this.position=position;

                    }

                    @Override
                    public void onCheckedChanged(CompoundButton buttonView,
                            boolean isChecked) {

                        if (isChecked) {
                            checkbox.setChecked(true);
            selectedPosition = position;
   EventAdapterAssign.this.notifyDataSetChanged();
                        } else {
                            checkbox.setChecked(false);

                        }
                        buttonView.setChecked(isChecked);

                    }


                }

        public Event getCheckedItems() {


                return event.get(selectedPosition);
            }

            public class ViewHolder extends RecyclerView.ViewHolder {
                //View
                public EditText EventTitle;
                public TextView EventDesc;
                public TextView EventStartTime;
                public TextView EventEndTime;
                public TextView EventID;
                public CheckBox selectCheckBox;

                //initiating View
                public ViewHolder(View itemView) {
                    super(itemView);

                    // display Check In event when beacon in range

                    EventTitle = (EditText)itemView.findViewById(R.id.EventTitle);
                    EventDesc = (TextView)itemView.findViewById(R.id.EventDesc);
                    EventStartTime = (TextView)itemView.findViewById(R.id.EventStartTime);
                    EventEndTime = (TextView)itemView.findViewById(R.id.EventEndTime);
                    EventID = (TextView)itemView.findViewById(R.id.EventID);

                    selectCheckBox = (CheckBox)itemView.findViewById(R.id.selectCheckBox);

                }
            }