我有一个ListView
使用自定义适配器。这ListView
允许多项选择,但不知何故它无法识别何时选择了某个项目。
我已经使适配器项目扩展为 Checkable,但仍然getCheckedItemPositions()
返回一个包含 false 的数组。
我想我做错了一些基本的事情,但到目前为止我还无法找到多个选择 ListView 的示例,其中适配器不是使用默认布局进行多个选择的 ArrayAdapter。
任何帮助将非常感激。
代码如下:
主要类别:
listView = (ListView) findViewById(R.id.cardlist);
tca = new TextCardAdapter(mInflater);
listView.setAdapter(tca);
Adapter:
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;
}
}
尝试一下:
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
holder.checkbox.setFocusable(false);
我认为是listView的子项视图应该实现Checkable接口,也就是说转换后的View(convertView)应该具有Checkable的所有方法。
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)