getView()调用position 0而不是最后一个

Question

这是我的getView()

public View getView(final int position, View convertView, ViewGroup parent) {
    Holder holder = null;
    if (convertView == null) {
        //MessageModel mm = messageModels.get(position);
        if(!messageModels.get(position).isIncoming()){
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item_messages_outgoing, null);
        }else {
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item_messages_incoming, null);
        }

        //only for debugging purpose
        Log.i(tag, position+", id: "+messageModels.get(position).getId()+", isIncoming: "+
                messageModels.get(position).isIncoming()+", msg: "+messageModels.get(position).getMessage());

        holder                      = new Holder();
        holder.tvMessage            = (TextView) convertView.findViewById(R.id.tvMessage);
        holder.tvTime               = (TextView) convertView.findViewById(R.id.tvTime);
        convertView.setTag(holder);
    } else {
        holder = (Holder)convertView.getTag();
    }

    holder.tvMessage.setText(messageModels.get(position).getMessage());
    holder.tvTime.setText(messageModels.get(position).getTime());

    return convertView;
}

从日志中，我发现了以下内容：

0, id: 11, isIncoming: true, msg: hi
1, id: 14, isIncoming: false, msg: hmmm
0, id: 11, isIncoming: true, msg: hi

也就是说，第一个索引在最后一个索引中重复。我尝试了更大的项目编号，它总是这样调用位置：0, 1, 2, 3, ... n-2, 0，所以我错过了n-1的th(最后)位置。我应该在哪里换车？

Answer 1

覆盖适配器类中的函数getCount()。并从那里返回messageModels.size()，看起来您可能会从那里返回(messageModels.size() - 1)。

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

Answer 2

实际上，我布局中的这一行android:stackFromBottom="true"导致了这一问题。我删除了它，问题就解决了。

Answer 3

在我的例子中，最后一项的返回位置为0：

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

    View view = convertView;

    if (convertView == null) {
        view = View.inflate(getContext(), R.layout.foo_row, null);
        fooModel = this.getItem(position);
        //proceed with fooModel
    }

    return view;
}

将其更改为下面解决了问题：

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

    if (convertView == null) {
        convertView = LayoutInflater.from(getContext()).inflate(R.layout.foo_row, parent, false);
    }
    fooModel = this.getItem(position);
    //proceed with fooModel

    return convertView;
}

另外，不要忘记在if-else条件检查中重置视图属性，例如：

if (fooModel.name != null) { yourView.setText(fooModel.name);  }
else { yourView.setText(''); }