Question

我创建了一个适配器，并尝试使用String ArrayList中的数据填充ListView。我注意到的是，我的ListView中存在的每个第4，第8和第12项都不存在于我的ListView中。如果我删除if / else（view == null）条件，除了收到lint警告＆gt;＆gt;之外，一切都很完美。 Unconditional layout inflation from view adapter: Should use View Holder pattern (use recycled view passed into this method as the second parameter) for smoother scrolling

这是我的getView代码，每跳过第4，第8，第12项

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        View view = convertView;
        ViewHolder holder;
        if (view == null) {
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.item_select, null);        
            holder = new ViewHolder();

            holder.rlLeft = (RelativeLayout) view.findViewById(R.id.rl_left);
            holder.rlRight = (RelativeLayout) view.findViewById(R.id.rl_right);
            holder.tvTitle = (TextView) view.findViewById(R.id.tv_title);   
            holder.tvLeftBubble = (TextView) view.findViewById(R.id.tv_left_bubble);
            holder.tvRightBubble = (TextView) view.findViewById(R.id.tv_right_bubble);
            holder.tvTitle.setText(mArrySelect.get(position).getTitle());

            // set visibility gone on views
            if (position % 2 == 0) {
                holder.rlLeft.setVisibility(View.GONE);
                holder.tvRightBubble.setText(mArrySelect.get(position).getMessage());
            } else {
                holder.rlRight.setVisibility(View.GONE);            
                holder.tvLeftBubble.setText(mArrySelect.get(position).getMessage());
            }

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

以下代码是WORKS并显示我的mArraySelect（String ArrayList）中的所有项目，但在我的inflate上给了我一个lint警告

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub

            View view = convertView;
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.item_select, null);        
            holder = new ViewHolder();

            holder.rlLeft = (RelativeLayout) view.findViewById(R.id.rl_left);
            holder.rlRight = (RelativeLayout) view.findViewById(R.id.rl_right);
            holder.tvTitle = (TextView) view.findViewById(R.id.tv_title);   
            holder.tvLeftBubble = (TextView) view.findViewById(R.id.tv_left_bubble);
            holder.tvRightBubble = (TextView) view.findViewById(R.id.tv_right_bubble);
            holder.tvTitle.setText(mArrySelect.get(position).getTitle());

            // set visibility gone on views
            if (position % 2 == 0) {
                holder.rlLeft.setVisibility(View.GONE);
                holder.tvRightBubble.setText(mArrySelect.get(position).getMessage());
            } else {
                holder.rlRight.setVisibility(View.GONE);            
                holder.tvLeftBubble.setText(mArrySelect.get(position).getMessage());
            }
        }

任何人都知道我在第一次实现中缺少什么导致跳过视图？我的mod条件只是交替两个不同的视图，并且工作正常。只是我的String ArrayList中的第4个，第8个和第12个项目没有显示。该阵列只有12个项目。

提前谢谢！

Answer 1

将以下代码移出最外面的if块可以解决此问题 -

// set visibility gone on views
            if (position % 2 == 0) {
                holder.rlLeft.setVisibility(View.GONE);
                holder.tvRightBubble.setText(mArrySelect.get(position).getMessage());
            } else {
                holder.rlRight.setVisibility(View.GONE);            
                holder.tvLeftBubble.setText(mArrySelect.get(position).getMessage());
            }

将它放在return语句的上方。

适配器未正确填充ArrayList

1 个答案: