Question

如果我使用ArrayList<ArrayList<String>>代替ArrayList<Object>来填充recyclerView，会不会有任何问题？或者我是这里唯一的怪人？

我在每个列表项中都有图像链接。有些还没有任何图像链接。

我在显示列表时第一次保存图像，然后在图像名称匹配时从SD卡中获取图像。我也有独特的图像名称。

当我滚动视图时，不包含任何图像的项目也会显示先前加载的图像，但不会复制文本。

我也在使用

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

@Override
public int getItemViewType(int position) {
    return position;
}

我的适配器中的这些功能。

Adapter.java

public class ChatBoxAdapter extends RecyclerView.Adapter<ChatBoxAdapter.MyViewHolder> {

ImageLoader imageLoader = AppController.getInstance().getImageLoader();

public class MyViewHolder extends RecyclerView.ViewHolder {

    public TextView text,date;
    public ImageView image;

    public MyViewHolder(View view) {
        super(view);

        text = (TextView) view.findViewById(R.id.text);
        date = (TextView) view.findViewById(R.id.date);
        image = (ImageView) view.findViewById(R.id.image);
    }
}

Context context;
Bitmap bitmap;

public ChatBoxAdapter(Context _context) {
    context = _context;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.item_chat_box, parent, false);

    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {

    String comment = Base.chatdatalist.get(position).get(3);
    String image_url = Base.chatdatalist.get(position).get(4);
    String date = Base.chatdatalist.get(position).get(5);

    File imageFile = null;

    if (image_url.startsWith(Base.baseUrl)) {

        String image_name = image_url.substring(image_url.lastIndexOf("/")+1);
        imageFile = new File(Environment.getExternalStorageDirectory().getPath() + "/Pictures/TMS Sent Images/" + image_name);
        bitmap = null;
        if (imageFile.exists()) {

            BitmapFactory.Options options = new BitmapFactory.Options();

            long img_size = imageFile.length() / 1024;
            if (img_size <= 200)
                options.inSampleSize = 4;
            else
                options.inSampleSize = 8;

            bitmap = BitmapFactory.decodeFile(imageFile.toString(), options);
        }
    }

    holder.text.setText(Html.fromHtml(comment, null, new MyTagHandler()));

    if (position !=0 && !chat_date.equals(Base.chatdatalist.get(position - 1).get(15)))
        holder.date.setVisibility(View.VISIBLE);
    if (position == 0)
        holder.date.setVisibility(View.VISIBLE);


    if (bitmap != null) {
        holder.image.setImageBitmap(bitmap);
        holder.image.setVisibility(View.VISIBLE);
    } else
        if (image_url.startsWith(Base.baseUrl)) {
            holder.image.setVisibility(View.VISIBLE);
            Picasso.with(context).load(image_url).into(holder.image);
        }
}

@Override
public int getItemCount() {
    return Base.chatdatalist.size();
}

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

@Override
public int getItemViewType(int position) {
    return position;
}
}

可能是什么问题？

提前致谢。

Answer 1

好吧，如果你不介意每次投射：ArrayList<String> foo = (ArrayList<String>) commentData.get(i)而不是ArrayList<String> x = commentsData.get(i)确定，请使用ArrayList<Object>

的ArrayList <数组列表<字符串>＆GT; vs ArrayList <object>

1 个答案: