Question

我正在使用GridView适配器显示图像（在R.drawable中）和图像下的文本描述（两者都在数组列表的strings.xml文件中编码）。我想在单击特定图像时在新活动中显示图像和文本。

仔细观察，我发现由于图像大小，最好使用int而不是位图作为图像，但是我遇到了适配器的问题......

该行：“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

你的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);
    }
}

网格视图适配器问题

1 个答案: