蜂窝上 ListFragment 中的 ListAdapter 具有兼容性 api

发布于 2024-12-11 14:25:37 字数 1597 浏览 0 评论 0原文

我正在使用兼容性 API 在 Android Gingerbread 和 honeycomb 设备上提供我的应用程序。我构建了一个 ListFragment 并将自己的 ListAdapter 实现设置为 ListFragment：

ListableAdapter adapter = new ListableAdapter(this.savedItems, (BaseActivity) this.getActivity());
this.setListAdapter(adapter);

ListAdapter 实现了 getView 像这样的方法：

public View getView(int pos, View convertView, ViewGroup parent) {
Log.d(this.getClass().getName(), "building list item @ " + pos);
View v = convertView;
if (!this.savedItems.isEmpty() && (pos < this.savedItems.size())) {
  if (v == null) {
    LayoutInflater vi = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    v = vi.inflate(R.layout.saved_list_item, null);
  }

  Listable item = this.savedItems.get(pos);
  Log.d(this.getClass().getName(), "Item @ " + pos + ": " + item.getDisplayName());
  if (item != null) {
    ImageView icon = (ImageView) v.findViewById(R.id.saved_item_icon);
    TextView title = (TextView) v.findViewById(R.id.saved_item);
    StarField star = (StarField) v.findViewById(R.id.favorit);
    star.setEnabled(false);

    icon.setImageResource(item.getImageID());
    title.setText(item.getDisplayName());
    star.setChecked(item.isFavorit());
  }
}
// this.pos++;
return v;
}

在 Gingerbread 设备（三星 Galaxy S2）上，这工作得非常好。我的列表已按我的预期填充。在我的 GalaxyTab 10.1 (Android 3.1) 上，参数 pos 出现在每次调用 0 中，因此我只有一个列表项。

有谁知道为什么 ListFragment 使用这种奇怪的参数调用 getView 吗？

原文

I am using the compatibility API to provide my app on Android Gingerbread and honeycomb devices.
I built a ListFragment and set my own ListAdapter implementation to the ListFragment:

ListableAdapter adapter = new ListableAdapter(this.savedItems, (BaseActivity) this.getActivity());
this.setListAdapter(adapter);

The ListAdapter implements the getView method like this:

public View getView(int pos, View convertView, ViewGroup parent) {
Log.d(this.getClass().getName(), "building list item @ " + pos);
View v = convertView;
if (!this.savedItems.isEmpty() && (pos < this.savedItems.size())) {
  if (v == null) {
    LayoutInflater vi = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    v = vi.inflate(R.layout.saved_list_item, null);
  }

  Listable item = this.savedItems.get(pos);
  Log.d(this.getClass().getName(), "Item @ " + pos + ": " + item.getDisplayName());
  if (item != null) {
    ImageView icon = (ImageView) v.findViewById(R.id.saved_item_icon);
    TextView title = (TextView) v.findViewById(R.id.saved_item);
    StarField star = (StarField) v.findViewById(R.id.favorit);
    star.setEnabled(false);

    icon.setImageResource(item.getImageID());
    title.setText(item.getDisplayName());
    star.setChecked(item.isFavorit());
  }
}
// this.pos++;
return v;
}

On Gingerbread Devices (Samsung Galaxy S2) this works very fine. My list is populated as I expected. On my GalaxyTab 10.1 (Android 3.1) the Parameter pos is in every call 0 so I just have one list item.

Does any one know why the ListFragment calls the getView with this strange parameters?

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