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我有一个使用 CursorLoader 填充的微调器。它被正确填充。但是 spinner.getAdapter().getCount() 一直返回 0。为什么会这样:(

我的微调班是

public class CategorySpinner extends Spinner implements LoaderManager.LoaderCallbacks<Cursor> {
  Context myContext;
  private SimpleCursorAdapter adapter;

  public CategorySpinner(Context context, AttributeSet attrs) {
    super(context, attrs);
    myContext=context;
  }


  public void fillData(int projectId) {

    String[] from = new String[] { Category.CATEGORYNAME };
    int[] to = new int[] { R.id.label1 };
    int layout = R.layout.category_list_item;
    Bundle bundle=new Bundle();
    bundle.putInt("ID", projectId);

    EditExpenseActivity mActivity=(EditExpenseActivity)myContext;
    mActivity.getLoaderManager().initLoader(0, bundle,this);
    adapter = new SimpleCursorAdapter(myContext, layout, null, from, to, 0);
    adapter.setDropDownViewResource(R.layout.category_list_item);
    this.setAdapter(adapter);
  }


  @Override
  public Loader<Cursor> onCreateLoader(int id, Bundle args) {

    String[] projection = { Category.FULL_ID,Category.CATEGORYNAME };
    Uri uri = Uri.parse(MyContentProvider.CATEGORY_LIST_PATH +args.getInt("ID"));
    CursorLoader cursorLoader = new CursorLoader(myContext, uri, projection,null, null, null);

    return cursorLoader;

   }

public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
adapter.swapCursor(data);
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
// data is not available anymore, delete reference
adapter.swapCursor(null);
}

}

调用微调器的活动是 EditExpenseActivity

public class EditExpenseActivity extends Activity {

private Context myContext;
private CategorySpinner sp_Category;
private Intent intent;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.add_edit_expense);
    intent=getIntent();
    final int mProjectId=intent.getIntExtra("ID",0);
    myContext = this;
    sp_Category = (CategorySpinner) findViewById(R.id.input_category);
            //fill spinner with categories of the project with Id mProjectId  
    sp_Category.fillData(mProjectId);

    //so far so good .. spinner is populated perfectly

    int i=sp_Category.getAdapter().getCount();

    }
}

调试显示 i 值为 0。为什么？？？

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