Question

您好！简单的购物清单应用（带自定义行的ListView，自定义适配器）。刚刚着名的listview复选框滚动问题。

请检查我的代码（正确的viewHolder实现）并帮助我找到保存数据的最简单方法。（在onDestroy（）之后）

ADAPTER：

public class ShopAdapter extends BaseAdapter {
private Context mainContex;
private ArrayList<ShopItem> shopItems;

static class ViewHolder {
    CheckBox checkBox;
    TextView textView;
}

public ShopAdapter(Context mainContex, ArrayList<ShopItem> shopItems) {
    this.mainContex = mainContex;
    this.shopItems = shopItems;
}

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

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

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final ShopItem shopItem = shopItems.get(position);
    final ViewHolder viewHolder;
    if (convertView == null) {
        viewHolder = new ViewHolder();

        LayoutInflater layoutInflater = LayoutInflater.from(mainContex);
        convertView = layoutInflater.inflate(R.layout.shoplist_item, null);

        viewHolder.textView = (TextView) convertView.findViewById(R.id.itemTextView);
        viewHolder.checkBox = (CheckBox) convertView.findViewById(R.id.doneCheckBox);

        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.checkBox.setTag(shopItems.get(position));
    viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                shopItem.setDone(true);
                viewHolder.textView.setTextColor(mainContex.getResources()
                        .getColor(R.color.done_text_color));
            } else {
                shopItem.setDone(false);
                viewHolder.textView.setTextColor(mainContex.getResources()
                        .getColor(R.color.secondary_text));
            }
        }
    });
    viewHolder.textView.setText(shopItem.getDescription());
    viewHolder.checkBox.setChecked(shopItem.isDone());
    return convertView;
}

}

项：

public class ShopItem {

private String description;
private boolean done;

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public boolean isDone() {
    return done;
}

public void setDone(boolean done) {
    this.done = done;
}

}

Answer 1

如果要将数据保存到列表视图中，则应使用数据库，建议使用SQLIte。请查看以下链接，获取有关如何操作的简单教程+源代码！

http://androidtuts4u.blogspot.com.br/2013/02/android-list-view-using-custom-adapter.html

ListView与自定义适配器。保存数据

1 个答案: