SimpleCursorAdapter和ViewBinder - 将数据绑定到ListView的项目上点击检索 [英] SimpleCursorAdapter and ViewBinder - Binding data to ListView items to be retrieved on click

问题描述

所以我有一个的ListView （使用 ListActivity ）我是从一个填充 SQLiteDatabase 。我试图给该行的ID（PK）连接到视图，使 onListItemClick 各列表项的，我可以使用该ID做的东西。

So I've got a ListView (using a ListActivity) that I'm populating from a SQLiteDatabase. I'm trying to attach the ID (PK) of the row to the view, so that onListItemClick of each list item, I can do stuff with that ID.

我读过的任意数据可以被设置为查看使用 setTag 和<$ C检索$ C> getTag （我没有实际上有这项工作还没有成功，所以这可能是问题）。下面是我使用的是什么（为了简化/简洁）的缩减版本下来：

I've read that arbitrary data can be set to a View using setTag and retrieved with getTag(I haven't actually had this work successfully yet, so this may be the problem). Here's a pared down version of what I'm using (for simplicity/brevity):

public class Favorites extends ListActivity {   
    public void onCreate(Bundle savedInstanceState){        
        super.onCreate(savedInstanceState);
        FavoritesDB db = FavoritesDB.getInstance(this);     
        Cursor c = db.fetchFavorites();
        startManagingCursor(c);     
        String[] columns = new String[] { "_id" };
        int[] to = new int[] { R.id.word };         
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.favorite, c, columns, to);     
        adapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
                view.setTag(cursor.getInt(0));
                return true;
            }
        });
        setListAdapter(adapter);        
    }   
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Object wordID = v.getTag();
        Toast.makeText(getBaseContext(), "ID=" + wordID, 1).show();
    }       
}

的的ListView被填充和吐司没有显示出来，但它总是ID = NULL，所以显然ID没有被中设置的 ViewBinder 来电 setTag （或不被检索财产 getTag ）。

The ListView is being populated, and the Toast does show up, but it's always "ID=null", so apparently the ID isn't being set in the ViewBinder call to setTag(or isn't being retrieved property with getTag).

推荐答案

这取决于具体的实现 R.layout.favorite 的。如果您有这方面的布局包含子TextViews用于例如父视图您设置的标签为TextViews同时从 onListItemClick（）是父查看收到的视图V。你需要确保你收到标签为你使用设置了同样的观点：

This depends on your implementation of R.layout.favorite. If you have this layout contains a parent view with child TextViews for e.g. the tag you set is for the TextViews while the View v received from the onListItemClick() is the parent View. You need to make sure that you receive the tag for the same view you set by using:

    @Override      
    protected void onListItemClick(ListView l, View v, int position, long id) {
    Object wordID = v.getChild(0).getTag();          
    Toast.makeText(getBaseContext(), "ID=" + wordID, 1).show();      
    }    

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