Question

我从JSON填充listview，我需要使用自定义适配器滚动到特定项目。我没有职位，因此我无法使用此post中提到的程序。

在这个结果JSON中，有一个字段ID，所以我想滚动到具有相应id的项目。

这是我用于LoadFields的代码（如果有帮助的话）：

    private void LoadData(String outputJSON) {
    try {
        calenList.clear();
        ParseJson(outputJSON);

        String[] ids = calId.toArray(new String[calId.size()]);
        String[] date = calData.toArray(new String[calData.size()]);
        String[] ore = calOra.toArray(new String[calOra.size()]);
        String[] isNexts = calIsNext.toArray(new String[calIsNext.size()]);

        for (int i = 0; i < calId.size(); i++) {
            Calendario calendario = new Calendario();

            calendario.setId(ids[i]);
            calendario.setData(date[i]);
            calendario.setOra(ore[i]);
            calendario.setIsNext(isNexts[i]);

            if (isNexts[i].equals("1")) {
                calendario.setType(1);
            } else
                calendario.setType(0);

            calenList.add(calendario);
            adapter.updateData(calenList);
        }

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                shareResult(position);
            }
        });

    } catch (JSONException e) {
        e.printStackTrace();
        Log.d(TAG, e.toString());
        Log.d(TAG, e.getMessage());
    }

}

这是我的适配器类：

public class CalendarioAdapter extends BaseAdapter {
private ArrayList<Calendario> listData;
private LayoutInflater layoutInflater;

public CalendarioAdapter(Context context, ArrayList listData) {
    this.listData = listData;
    layoutInflater = LayoutInflater.from(context);
}

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

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

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

@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    return listData.get(position).getType();
}

@Override
public View getView(int position, View convertView, final ViewGroup parent) {
    ViewHolder holder;
    int type = getItemViewType(position);

    if (convertView == null) {
        if (type == 0)
            convertView = layoutInflater.inflate(R.layout.calendario_row_layout, null);
        else
            convertView = layoutInflater.inflate(R.layout.calendario_row_layout_next, null);

        holder = new ViewHolder();
        holder.edData = (TextView) convertView.findViewById(R.id.edData);
        holder.edOra = (TextView) convertView.findViewById(R.id.edOra);
        holder.edSqCasa = (TextView) convertView.findViewById(R.id.edSqCasa);
        holder.edSqTras = (TextView) convertView.findViewById(R.id.edSqTrasf);
        holder.edRisult = (TextView) convertView.findViewById(R.id.edRisultato);
        holder.imLogoCasa = (ImageView) convertView.findViewById(R.id.imLogoCasa);
        holder.imLogoTras = (ImageView) convertView.findViewById(R.id.imLogoTras);

        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    Calendario calendario = (Calendario) listData.get(position);
    holder.edData.setText(calendario.getData());
    holder.edOra.setText(calendario.getOra());
    holder.edSqCasa.setText(calendario.getSqCasa());
    holder.edSqTras.setText(calendario.getSqTras());
    holder.edRisult.setText(calendario.getPuntiCasa() + " - " + calendario.getPuntiTras());
    if (holder.imLogoCasa != null) Ion.with(holder.imLogoCasa).load(calendario.getLogoCasa());
    if (holder.imLogoTras != null) Ion.with(holder.imLogoTras).load(calendario.getLogoTras());


    return convertView;
}

static class ViewHolder {
    TextView edData;
    TextView edOra;
    TextView edSqCasa;
    TextView edSqTras;
    TextView edRisult;
    ImageView imLogoCasa;
    ImageView imLogoTras;
}

public void updateData(ArrayList<Calendario> updatedData) {
    listData = updatedData;
    this.notifyDataSetChanged();
}

}

Answer 1

I fill a listview from a JSON and I need to scroll to a specific item, with a custom adapter. I don't have a position so I can't use the procedures mentioned in this post.

In this result JSON, there is a field ID, so i want to scroll to the item that has got the corresponding id.

=＆GT; Android没有提供任何此类方法，您可以通过这些方法通过ListView中使用的数据转到特定方法。您必须遍历列表项以查找具有相同项ID的列表项位置。

顺便说一下，您的代码需要通过以下标准做法进行改进。

    String[] ids = calId.toArray(new String[calId.size()]);
    String[] date = calData.toArray(new String[calData.size()]);
    String[] ore = calOra.toArray(new String[calOra.size()]);
    String[] isNexts = calIsNext.toArray(new String[calIsNext.size()]);

您不应该为每个数据项采用单独的数组，而是选择POJO类。您还应该尝试一下GSON库，它可以帮助您直接从给定的json响应中准备pojo对象列表。

Android ListView滚动到特定项目（不是位置）

1 个答案: