android - 具有 20 种不同类型的行的 ListView( Activity 提要)，每行有 20 个不同的 View

Question

一周前，我在 stackoverflow 上问了一个关于在其中包含不同种类项目的 ListView 的问题。

I know how to populate a list with custom items via custom adapter. But how do I populate it with a few different types of items?

当时我不知道这会有什么不同，所以我提到我只有 4 种类型的列表项，以免使事情复杂化。我得到了一些回应，其中解释了极其简单的案例(2 种类型的项目，每个项目内部都有一个 View )。我不认为我可以实现我得到的示例中解释的那些方法，我需要一种更面向对象的方法。

我想要一个单独的类，它采用 XML 布局并处理其 View 和按钮。

像这样:

public class MyProfileCommentAdapter extends BaseAdapter {

    private ArrayList<String> itemNames =  new ArrayList<String>();
    private ArrayList<Double> itemRatings = new ArrayList<Double>();
    private ArrayList<String> itemComments  = new ArrayList<String>();
    private ArrayList<String> itemCommentDates   = new ArrayList<String>();
    private ArrayList<Integer> itemIds = new ArrayList<Integer>();
    private Context context;
    private LayoutInflater layoutInflater;

    private ImageButton iMyCommentsCommentedProductImage;
    private TextView tvMyCommentsCommentedItemName;
    private TextView tvMyCommentsCommentedItemDate;
    private TextView tvMyCommentsCommentedItemContent;
    private TextView tvMyCommentsCommentedItemRating;
    private Button bMyCommentsEditComment;
    private Button bMyCommentsDeleteComment;

    public MyProfileCommentAdapter(Context context, ArrayList<String> itemNames, ArrayList<Double> itemRatings, ArrayList<String> itemComments, ArrayList<String> itemCommentDates, ArrayList<Integer> itemIds){

        this.context = context;
        this.itemNames = itemNames;
        this.itemComments = itemComments;
        this.itemCommentDates = itemCommentDates;
        this.itemRatings = itemRatings;
        this.itemIds = itemIds;

        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

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

    @Override
    public Object getItem(int arg0) {
        return itemIds.get(arg0)    ;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(convertView==null) {
            convertView = layoutInflater.inflate(R.layout.item_adapterable_my_profile_comment, parent, false);
        }

        iMyCommentsCommentedProductImage = (ImageButton) convertView.findViewById(R.id.iMyCommentsCommentedProductImage);
        tvMyCommentsCommentedItemName = (TextView) convertView.findViewById(R.id.tvMyCommentsCommentedItemName);
        tvMyCommentsCommentedItemDate = (TextView) convertView.findViewById(R.id.tvMyCommentsCommentedItemDate);
        tvMyCommentsCommentedItemContent = (TextView) convertView.findViewById(R.id.tvMyCommentsCommentedItemContent);
        tvMyCommentsCommentedItemRating = (TextView) convertView.findViewById(R.id.tvMyCommentsCommentedItemRating);
        bMyCommentsEditComment = (Button) convertView.findViewById(R.id.bMyCommentsEditComment);
        bMyCommentsDeleteComment = (Button) convertView.findViewById(R.id.bMyCommentsDeleteComment);    

        tvMyCommentsCommentedItemName.setText(itemNames.get(position));
        tvMyCommentsCommentedItemDate.setText(itemCommentDates.get(position));
        tvMyCommentsCommentedItemRating.setText(String.valueOf(itemRatings.get(position)));
        tvMyCommentsCommentedItemContent.setText(itemComments.get(position));

        return convertView;
    }
}

我需要大约 20 个这些并将它们全部放在 ListView 中(我的应用程序的 Activity 提要)，具体取决于我的应用程序中最近发生的 Activity 。每个不同的 Activity 都有一个单独的 XML，其中定义了与这个 Activity 一样多的 View 元素，所有 Activity 都在做和显示不同的东西。

现在，如果我要使用建议的方法，

 @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            int type = getItemViewType(position);
            Log.v(LOG_TAG, "getView " + position + " " + convertView + " type = " + type);
            if (convertView == null) {
                holder = new ViewHolder();
                switch (type) {
                case TYPE_ITEM:
                    convertView = mInflater.inflate(R.layout.item, null);
                    holder.textView = (TextView)convertView.findViewById(R.id.text);
                    break;
                case TYPE_SEPARATOR:
                    convertView = mInflater.inflate(R.layout.separator, null);
                    holder.textView = (TextView)convertView.findViewById(R.id.textSeparator);
                    break;
                default:
                    break;
                }
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder)convertView.getTag();
            }
            holder.textView.setText(mData.get(position));
            return convertView;
        }

看起来很简单，不是吗？但就我而言，我应该在 SWITCH 中有 20 个不同的案例，每个案例中应该有 20-30 行代码。我不想以这种方式实现它。可悲的是，我不知道该怎么做......

Answer 1

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