查看持有人模式不起作用

时间:2015-01-30 17:06:34

标签: android listview checkbox

我已经实现了一个自定义列表视图,其中我有两个textview和复选框。这些被封装成线性布局点击我选中/取消选中复选框。我面临的问题是,当我点击线性布局时,它会检查复选框,但它也会检查固定模式上的其他复选框,即每7-8行。我读了很多关于它的问题,发现实现一个视图持有者可以解决问题,但这也不适合我。以下是我的代码:

CustomListAdapter:

public class ContactsListAdapter extends BaseAdapter{

    private Context context;
    private List<ContactInfo> contacts;
    private List<ContactInfo> selectedContacts;

    public ContactsListAdapter(Context context, List<ContactInfo> contacts) {
        this.context = context;
        this.contacts = contacts;
        selectedContacts = new ArrayList<ContactInfo>();
    }

    public List<ContactInfo> getSelectedContacts() {
        return selectedContacts;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return contacts.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return contacts.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return Long.parseLong(contacts.get(position).id);
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        final ViewHolder holder;

        if(convertView == null) {
            convertView = inflater.inflate(R.layout.contacts_list_row_item, null);
            holder = new ViewHolder();
            holder.view = (LinearLayout) convertView.findViewById(R.id.llContactRow);
            holder.name = (TextView) convertView.findViewById(R.id.tvContactName);
            holder.number = (TextView) convertView.findViewById(R.id.tvContactNumber);
            holder.checkbox = (CheckBox) convertView.findViewById(R.id.cbMultipleSelect);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.name.setText(contacts.get(position).name);
        holder.number.setText(contacts.get(position).number);
        holder.view.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                ContactInfo contact = new ContactInfo();
                contact.id = contacts.get(position).id;
                contact.name = contacts.get(position).name;
                contact.number = contacts.get(position).number;
                holder.checkbox.setChecked(!holder.checkbox.isChecked());
                if(holder.checkbox.isChecked()) {
                    selectedContacts.add(contact);
                } else {
                    selectedContacts.remove(contact);
                }
            }
        });

        return convertView;
    }

    private static class ViewHolder {
        LinearLayout view;
        CheckBox checkbox;
        TextView name;
        TextView number;
    }
}

我做错了什么?请帮忙。

修改 在做了@vinitius要求我做的事情之后问题得到了解决,但是当我滚动列表时支票正在消失。这是我的新getView()

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    final ViewHolder holder;

    if(convertView == null) {
        convertView = inflater.inflate(R.layout.contacts_list_row_item, null);
        holder = new ViewHolder();
        holder.view = (LinearLayout) convertView.findViewById(R.id.llContactRow);
        holder.name = (TextView) convertView.findViewById(R.id.tvContactName);
        holder.number = (TextView) convertView.findViewById(R.id.tvContactNumber);
        holder.checkbox = (CheckBox) convertView.findViewById(R.id.cbMultipleSelect);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.name.setText(contacts.get(position).name);
    holder.number.setText(contacts.get(position).number);
    holder.checkbox.setChecked(selectedContacts.contains(contacts.get(position)));
    holder.view.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            ContactInfo contact = new ContactInfo();
            contact.id = contacts.get(position).id;
            contact.name = contacts.get(position).name;
            contact.number = contacts.get(position).number;
            holder.checkbox.setChecked(!holder.checkbox.isChecked());
            if(holder.checkbox.isChecked()) {
                selectedContacts.add(contact);
            } else {
                selectedContacts.remove(contact);
            }
        }
    });

    return convertView;
}

2 个答案:

答案 0 :(得分:1)

您的问题是您需要将holder.checkbox.setChecked()设置为该行下方的值:

    holder.number.setText(contacts.get(position).number);

目前,您在检查它时会更改它的值,但是您需要在调用getview方法时设置该值,否则它将保留之前的任何值。

如果您在contactinfo中有一个“选定”值而不是管理新列表,那可能是最好的。这样你可以做类似的事情:

holder.checkbox.setChecked(contacts.get(position).isSelected);

答案 1 :(得分:1)

您未在getView()中展示自己的内容。执行以下操作:

  @Override
        public void onClick(View v) {
            //remove the other stuff. You don't want to create new instances here, otherwise you won't be able to remove them later 
            holder.checkbox.setChecked(!holder.checkbox.isChecked());
            if(holder.checkbox.isChecked()) {
                selectedContacts.add(contact.get(position));
            } else {
                selectedContacts.remove(contact.get(position));
            }
        }

在为OnClickListener设置LinearLayout之前执行此操作:

holder.checkbox.setChecked(selectedContacts.contains(contacts.get(position)));

如果您在点击CheckBox时想要相同的行为,只需添加到CheckBox xml:

android:clickable="false"

所以linearLayout可以拦截它