具有多个选择和自定义适配器的Android ListView

Question

我有一个ListView自定义适配器.在ListView允许多个选择,但不知何故,当一个项目被选中它不承认.

我已经使适配器项扩展了Checkable,但仍然getCheckedItemPositions()返回了一系列的falses.

我想有一些基本的我做错了,但到目前为止我还无法找到多个选择ListView的示例,其中适配器不是ArrayAdapter,使用多个选择的默认布局.

任何帮助将非常感激.

代码如下:

主要课程:

listView = (ListView) findViewById(R.id.cardlist);

tca = new TextCardAdapter(mInflater);
listView.setAdapter(tca);

适配器:

public class TextCardAdapter extends BaseAdapter {
private int count = 0;
private List<CheckableCard> cardList = new ArrayList<CheckableCard>();
private LayoutInflater mInflater;

public TextCardAdapter(LayoutInflater inflater) {
    this.mInflater = inflater;
}

@Override
public int getCount() {
    return count;
}

@Override
public Object getItem(int position) {
    return cardList.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.textlayout_row, null, false);
        convertView.setClickable(true);

        holder = new ViewHolder();
        holder.text = (TextView) convertView.findViewById(R.id.card_name);
        holder.checkbox = (CheckBox) convertView.findViewById(R.id.checkbox);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    final CheckableCard card = cardList.get(position);

    holder.text.setText(card.card.toString());
    holder.checkbox.setChecked(card.isChecked());
    holder.checkbox.setOnClickListener(card.checkListener);
    convertView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            card.checkListener.onClick(v);
            holder.checkbox.setChecked(card.isChecked());
        }
    });

    return convertView;
}

public void add(Card card) {
    cardList.add(new CheckableCard(card));
    count++;
    notifyDataSetChanged();
}

public void addAll(Collection<Card> cardColl) {
    for (Card c : cardColl)
        add(c);
}

public void removeAll() {
    count = 0;
    cardList.clear();
    notifyDataSetChanged();
}

public Card getCard(int position) {
    CheckableCard cc = (CheckableCard) getItem(position);
    if (cc == null) return null;
    return cc.card;
}

public class CheckableCard implements Checkable {
    private boolean checked = false;
    public final Card card;
    public final OnClickListener checkListener;

    public CheckableCard(Card card) {
        this.card = card;
        checkListener = new OnClickListener() {

            @Override
            public void onClick(View v) {
                toggle();
            }
        };
    }

    @Override
    public boolean isChecked() {
        return checked;
    }

    @Override
    public void setChecked(boolean checked) {
        this.checked = checked;
    }

    @Override
    public void toggle() {
        checked = !checked;
    }

}

static class ViewHolder {
    TextView text;
    CheckBox checkbox;
}
}

Answer 1

试一试:

1. listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

2. holder.checkbox.setFocusable(false);

3. 我认为这是listView的子项视图shoudld实现了Checkable接口,这意味着转换后的View(convertView)应该具有Checkable的所有方法.