android - 如何限制 ListView 中的复选框选择？

friend 们，

我想将 android listivew 中的复选框选择限制为例如只应选择 3 个复选框，否则它应该给出错误消息。

用户可以从列表中选择任意三个复选框
任何人指导我如何实现这一目标？这是我的适配器

public class AdapterContacts extends BaseAdapter  {

    private LayoutInflater mInflater;

    public Context context;
    public static List<myContacts> contacts;

    public AdapterContacts(Context context,List<myContacts> list) {
      mInflater = LayoutInflater.from(context);
      this.context = context;
      contacts= list;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {

      ViewHolder holder;

      if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_contacts, null);
        holder = new ViewHolder();
        holder.contactName = (TextView) convertView.findViewById(R.id.contactName);
        holder.contactNumber = (TextView) convertView.findViewById(R.id.contactNumber);
        holder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox);
        convertView.setTag(holder);

      } else {
        holder = (ViewHolder) convertView.getTag();
      }

      myContacts contact = getItem(position);
      holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked) {
                 myContacts c = (myContacts) checkboxView.getTag();
                 c.setSelected(isChecked);
                 // to put that check of selection limit with error


            }
        });


      holder.checkBox.setTag(contact);
      holder.checkBox.setChecked(contact.isSelected());



      holder.contactName.setText(contact.getContactName());
      holder.contactNumber.setText(contact.getPhoneNumber());

        return convertView;

        }

    @Override
    public int getCount() {
        return contacts.size();
    }

    @Override
    public myContacts getItem(int position) {
        return contacts.get(position);
    }

    @Override
    public long getItemId(int arg0) {
        return 0;
    }


    class ViewHolder {
        TextView contactName;
        TextView contactNumber;
        CheckBox  checkBox;
      }




}

任何帮助，将不胜感激。

最佳答案

最后我解决了这个问题:) 其中 globalInc 是具有默认值 0 的全局变量

holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener()
      {

            @Override
            public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked)
            {
                 myContacts c = (myContacts) checkboxView.getTag();

                 if(isChecked)
                 {
                     globalInc++;
                 }
                 else if(!isChecked)
                 {
                     globalInc--;
                 }
                 if(globalInc >= 4)// it will allow 3 checkboxes only
                 {
                     Toast.makeText(context, "Error = " + globalInc, Toast.LENGTH_LONG).show();
                     checkboxView.setChecked(false);
                     globalInc--;
                 }
                 else
                 {
                    c.setSelected(isChecked);
                 }
                 System.out.println(" ---------------    "+globalInc);
            }
        });