如何在 Android 的 ListView 中显示图像列表? [英] How to display a list of images in a ListView in Android?

问题描述

如何使用 ListView 显示图像列表?我正在运行时下载图像.图片总数不固定.

How do I display a list of images using the ListView? I am downloading the images at run time. The total number of images is not fixed.

推荐答案

我会从这样的事情开始(如果我的代码有问题，我当然会感谢任何评论):

I'd start with something like this (and if there is something wrong with my code, I'd of course appreciate any comment):

public class ItemsList extends ListActivity {

private ItemsAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.items_list);

    this.adapter = new ItemsAdapter(this, R.layout.items_list_item, ItemManager.getLoadedItems());
    setListAdapter(this.adapter);
}

private class ItemsAdapter extends ArrayAdapter<Item> {

    private Item[] items;

    public ItemsAdapter(Context context, int textViewResourceId, Item[] items) {
        super(context, textViewResourceId, items);
        this.items = items;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.items_list_item, null);
        }

        Item it = items[position];
        if (it != null) {
            ImageView iv = (ImageView) v.findViewById(R.id.list_item_image);
            if (iv != null) {
                iv.setImageDrawable(it.getImage());
            }
        }

        return v;
    }
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    this.adapter.getItem(position).click(this.getApplicationContext());
}
}

例如使用自己的项目类型(保存有关您的图片的信息)扩展 ArrayAdapter 并覆盖 getView() 方法，为列表中的项目准备视图.ArrayAdapter 上还有一个方法 add() 可以将项目添加到列表的末尾.

E.g. extending ArrayAdapter with own type of Items (holding information about your pictures) and overriden getView() method, that prepares view for items within list. There is also method add() on ArrayAdapter to add items to the end of the list.

R.layout.items_list 是带有 ListView

R.layout.items_list_item 是表示列表中一项的布局

R.layout.items_list_item is layout representing one item in list

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