Question

TL; DR - 我有一个数组适配器，由User对象的ArrayList填充，我想打印他们的订单号 - 第1，第2，第3 ......等 - 快速来回滚动..这些数字混合在一起......

在快速来回滚动之后

而不是1,2,3,4我得到1,2,9,4例如..

我不明白为什么会发生这种情况，我已经尝试了几种方法来解决它但没有成功，我甚至从视图持有者那里获取了该文本视图，看看它是否有帮助但是没有成功太

这是我的适配器：

public class HomeHallOfFameAdapter extends ArrayAdapter<User> {

private HomeFragment fragment;
private ArrayList<User> data;
int page;

public HomeHallOfFameAdapter(Context context, ArrayList<User> data, HomeFragment fragment, int page) {
    super(context, 0);
    this.data = data;
    this.fragment = fragment;
    this.page = page;
}

@Override
public int getCount() {
    return data != null ? data.size() : 0;
}

@Override
public User getItem(final int position) {
    return data.get(position);
}

@Override
public long getItemId(final int position) {
    //only used for adapters connected to a cursor.
    return position;
}

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

    MyHolder holder = null;

    final User user = data.get(position);

    //initiallize the views
    if (convertView == null) {

        convertView = LayoutInflater.from(getContext()).inflate(R.layout.home_frag_hall_of_fame_item, null);
        holder = new MyHolder();

        holder.profileImage1 = (ImageView) convertView.findViewById(R.id.home_hallofame_image);

        convertView.setTag(holder);

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

    final TextView titleRank = (TextView) convertView.findViewById(R.id.home_hallofame_title);
    final String numberEnding = MainScreenActivity.getInstance().NumberWithSuffix(position+1);
    titleRank.setText(numberEnding);

    loadImage(user.getImages().get(0), holder.profileImage1);

    return convertView;
    //return super.getView(position, convertView, parent);
}

private class MyHolder {
    //TextView titleRank;
    ImageView profileImage1; //fameBlueBtn;
}

}

问题是titleRank textView ..

NumberWithSuffix只是一个实现结尾数字的方法：

//method to get the currect number endings.
public String NumberWithSuffix(int number) {

    String outputNumber = "";
    String numberString = String.valueOf(number);

    if (String.valueOf(number).endsWith("11")) {
        outputNumber = numberString + "th";
    } else if (String.valueOf(number).endsWith("12")) {
        outputNumber = numberString + "th";
    } else if (String.valueOf(number).endsWith("13")) {
        outputNumber = numberString + "th";
    } else if (String.valueOf(number).endsWith("1")) {
        outputNumber = numberString + "st";
    } else if (String.valueOf(number).endsWith("2")) {
        outputNumber = numberString + "nd";
    } else if (String.valueOf(number).endsWith("3")) {
        outputNumber = numberString + "rd";
    } else {
        outputNumber = numberString + "th";
    }
    return outputNumber.trim();
}

知道我的问题是什么？

感谢您的帮助。

Answer 1

你有这个

MainScreenActivity.getInstance()

我假设你在这里实例化一个Activity类。我建议你将NumberWithSuffix(int number)移动到适当的Utility类，使方法静态，你可以在其他地方使用相同的。您的所有实用程序都不应该在Activity中。还要注意保持对活动的引用并避免内存泄漏

你的物品位置似乎很好。我测试了你的样品，它工作正常。

您可以进行一些更改，以遵循以下

的视图模式

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

MyHolder holder = null;

final User user = data.get(position);

//initiallize the views
if (convertView == null) {

    convertView = LayoutInflater.from(getContext()).inflate(R.layout.home_frag_hall_of_fame_item, null);
    holder = new MyHolder();

    holder.profileImage1 = (ImageView) convertView.findViewById(R.id.home_hallofame_image);
    holder.titleRank = (TextView) convertView.findViewById(R.id.home_hallofame_title);

    convertView.setTag(holder);

} else {
    holder = (MyHolder) convertView.getTag();
}
final String numberEnding = Utility.NumberWithSuffix(position+1);
holder.titleRank.setText(numberEnding);

loadImage(user.getImages().get(0), holder.profileImage1);

return convertView;

}

ViewHolder

private static class MyHolder {
    TextView titleRank;
    ImageView profileImage1; //fameBlueBtn;

}

创建一个实用程序类

public class Utility {

    public static String NumberWithSuffix(int number) {

        String outputNumber = "";
        String numberString = String.valueOf(number);

        if (String.valueOf(number).endsWith("11")) {
            outputNumber = numberString + "th";
        } else if (String.valueOf(number).endsWith("12")) {
            outputNumber = numberString + "th";
        } else if (String.valueOf(number).endsWith("13")) {
            outputNumber = numberString + "th";
        } else if (String.valueOf(number).endsWith("1")) {
            outputNumber = numberString + "st";
        } else if (String.valueOf(number).endsWith("2")) {
            outputNumber = numberString + "nd";
        } else if (String.valueOf(number).endsWith("3")) {
            outputNumber = numberString + "rd";
        } else {
            outputNumber = numberString + "th";
        }
        return outputNumber.trim();
    }
}

也代替了这个

final User user = data.get(position);

您可以使用

final User user = getItem(position);

因为你已经

了

@Override
public User getItem(final int position) {
return data.get(position);
}

Answer 2

我会选择带有2个数据集的BaseAdapter（或者你需要更多数据集），然后在getView（）的数据集中按类型混合......

Answer 3

所以..我已经解决了这个问题.. 我的代码没问题，正如我所提到的，它在垂直列表视图中工作正常，但这个问题发生在水平列表视图中。我删除了我正在使用的列表视图github库并切换到Horizontal Recycler View ..它现在很好用！

Android - ArrayAdapter混合职位？

3 个答案: