如何显示图像的列表在Android的一个ListView？ [英] How to display a list of images in a ListView in Android?

问题描述

我如何使用显示在ListView的图像列表？我是你下载的图像在运行时。图像的总数不固定。

How do I display a list of images using the ListView? I am dowloading 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（如果有当然是AP preciate任何错误的东西与我的code，我会注释）：

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。与自己的类型的项目扩展ArrayAdapter（控股关于图片的信息），并重写 getView（）法，即prepares查看列表中的项目。还有在ArrayAdapter将项目添加到列表的末尾方法添加（）。

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 与的ListView

R.layout.items_list_item 是布局重新presenting列表中的一个项目。

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

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