适配器未正确从 ArrayList 填充

Question

我创建了一个适配器，并试图用 String ArrayList 中的数据填充 ListView。我注意到，存储在我的 ArrayList 中的每第 4、8 和 12 个项目都没有出现在我的 ListView 中。如果我删除 if/else (view == null) 条件，一切正常，除了我收到 lint 警告 >> 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，每第 4、8、12 项跳过一次

    @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;
    }

这是有效的代码，它显示了我的 mArraySelect（字符串数组列表）中的所有项目，但在我的 inflate

中给出了 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());
            }
        }

任何人都知道我在我的第一个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，而且效果很好。只是我的 String ArrayList 中的第 4、8 和 12 项没有显示。该数组只有 12 项。

提前致谢！

Answer 1

将以下代码移出最外层的 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());
            }

将其放在 return 语句的正上方。

适配器未正确从 ArrayList 填充

Adapter Not Populating From ArrayList Properly

android

listview

adapter