网格视图适配器问题

Question

我正在使用 GridView 适配器来显示图像（在 R.drawable 中）和图像下的文本描述（这两件事都在数组列表中的 strings.xml 文件中编码）。单击特定图像时，我想在新活动中显示图像和文本。

通过 SO，我发现由于图像大小，最好使用 int 而不是 bitmap 图像，但我遇到了适配器问题......

行：“holder.image.setImageResource(imgs.getResourceId(0, -1));”如下所示在 logcat 中给我一个错误。

有什么建议吗？

GridViewAdapter 代码：

    public GridViewAdapter(Context context, int layoutResourceId, ArrayList<ImageItem> data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

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

    if (row == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);
        holder = new ViewHolder();
        holder.imageTitle = (TextView) row.findViewById(R.id.text);
        holder.image = (ImageView) row.findViewById(R.id.image);

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

    ImageItem item = data.get(position);
    holder.imageTitle.setText(item.getTitle());
    // problem code >>> holder.image.setImageResource(imgs.getResourceId(0, -1));
    return row;
}

static class ViewHolder {
    TextView imageTitle;
    ImageView image;
}

Answer 1

您的 getView 方法应如下所示。

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

    if (row == null) {
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);
        holder = new ViewHolder(row);
        row.setTag(holder);
    } else {
        holder = (ViewHolder) row.getTag();
    }

    ImageItem item = data.get(position);
    holder.imageTitle.setText(item.getTitle());
    holder.image.setImageResource(imgs.getResourceId(0, -1));
    return row;
}

您的视图持有者类应如下所示

static class ViewHolder {
    public TextView imageTitle;
    public ImageView image;

    public ViewHolder(View view) {
        image = (ImageView) view.findViewById(R.id.image);
        imageTitle = (TextView) view.findViewById(R.id.text);
    }
}