我有一类具有两列 CATEGORY_ID 和名称。我创建了一个名为数据助手类 CategoryDataHelper 。我有一个名为方法 getCategoryCursor（）其获取从类别表中的ID和名称，并返回游标，辅助类的。使用游标，我已经使用 SimpleCursorAdapter 来显示类别列表。这是工作的罚款。

 公共类分类扩展ListActivity {

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        categoryDataHelper =新CategoryDataHelper（getApplicationContext（））;
        光标categoryCursor = categoryDataHelper.getCategoryCursor（）;
        ListAdapter适配器=新SimpleCursorAdapter（
                本，
                android.R.layout.simple_list_item_1，
                categoryCursor，
                新的String [] {} CategoryDataHelper.NAME，
                新的INT [] {android.R.id.text1}）;

        //绑定到我们新的适配器。
        setListAdapter（适配器）;

        表= getListView（）;
        list.setOnItemClickListener（新OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，INT位置，长的id）{
                //这里我想CATEGORY_ID
            }
        }）;
    }
}
 

现在我想实现一个 OnItemClickListener 并发送所选类别的意图与 CATEGORY_ID 。我怎样才能在 onItemClick（）法的ID？

您也许应该从适配器光标。这样，如果你的光标被替换你仍然仍然得到一个有效的光标。

 光标光标=（（SimpleCursorAdapter）适配器视图）.getCursor（）;
cursor.moveToPosition（位置）;
长的categoryId = cursor.getLong（cursor.getColumnIndex（CategoryDataHelper.ID））;
 

或使用CATEGORY_ID或任何你列的名称很到位 CategoryDataHelper.ID 。

I have a category table with two columns category_id and name. I have created a data helper class named CategoryDataHelper. I have a method named getCategoryCursor() of that helper class which fetches the id and the name from the category table and returns the cursor. Using that cursor, I have used SimpleCursorAdapter to display the list of categories. It is working fine.

public class Categories extends ListActivity  {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        categoryDataHelper = new CategoryDataHelper(getApplicationContext());
        Cursor categoryCursor  = categoryDataHelper.getCategoryCursor();
        ListAdapter adapter = new SimpleCursorAdapter (
                this,  
                android.R.layout.simple_list_item_1,
                categoryCursor,                                              
                new String[] { CategoryDataHelper.NAME },           
                new int[] {android.R.id.text1});  

        // Bind to our new adapter.
        setListAdapter(adapter);

        list = getListView();
        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // Here I want the category_id  
            }
        });
    }    
}

Now I want to implement an OnItemClickListener and send an Intent with the category_id of the selected category. How can I get the id in the onItemClick() method?

You probably should get the cursor from the adapter. This way if your cursor gets replaced you are still are still getting a valid cursor.

Cursor cursor = ((SimpleCursorAdapter) adapterView).getCursor();
cursor.moveToPosition(position);
long categoryId = cursor.getLong(cursor.getColumnIndex(CategoryDataHelper.ID));

or use "category_id" or whatever the name of your column is in place of CategoryDataHelper.ID.