复制和粘贴

 为（mCheckedState =新的ArrayList＆LT;布尔＆GT;（！）; cursor.isAfterLast（）; cursor.moveToNext（））{
    mCheckedState.add（cursor.getInt（cursor.getColumnIndex（Groceries.COLUMN_CHECKED））！= 0）;
}
 

到您的适配器类中的公共helper方法（即公共无效populateAdapter（））。

然后，在 onLoadFinished 交换光标（用 mAdapter.swapCursor（光标）），然后调用 mAdapter.populateAdapter（）。这将确保你的光标被绑定到适配器尝试填充 mCheckedState 之前。

这是说，我不是很确定你正在尝试在首位， mCheckedState 做...为什么你不能只选中/取消意见直接使用光标在 bindView ？

I have a problem with trying to use a suggested CursorAdapter implementation together with a CursorLoader. The CursorAdapter works beatifully when I can provide it with a static set of data through a Cursor, but when I try and combine this with a CursorLoader I get a problem with nullpointers. I have pinned it down to the fact that when I feed the adapter a cursor, it is initially empty (set to null as is frequently suggested when dealing with a CursorLoader implementation). The Adapter, on instantiation, loops through the cursor to figure out what state a checkbox is in and then goes through to populate data in various textviews and widgets. Unfortunately, the cursor is null on instantiation, only to be fed sets of data when the CursorLoader is done. I'm trying to figure out if it's at all possible to use this CursorAdapter together with a CursorLoader and would really appreciate some help.

Here's my complete Adapter:

public class ShopperListCursorAdapter extends CursorAdapter implements OnClickListener, LOG {
    private LayoutInflater mInflater;
    private GroceriesHelper mHelper;
    private List<Boolean> mCheckedState;

    public ShopperListCursorAdapter(Context context, Cursor cursor, GroceriesHelper helper, int flags) {
        super(context, cursor, flags);
        mHelper = helper;
        mInflater = LayoutInflater.from(context);
        for(mCheckedState = new ArrayList<Boolean>(); !cursor.isAfterLast(); cursor.moveToNext()) {
            mCheckedState.add(cursor.getInt(cursor.getColumnIndex(Groceries.COLUMN_CHECKED)) != 0);
        }
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        Log.d(TAG, "newView");
        View view = mInflater.inflate(R.layout.listview_row, null);
        ViewHolder holder = new ViewHolder();
        holder.amount = (TextView) view.findViewById(R.id.text_amount);
        holder.unit = (TextView) view.findViewById(R.id.text_unit);
        holder.item = (TextView) view.findViewById(R.id.text_item);
        holder.checked = (CheckBox) view.findViewById(R.id.check_item);
        holder.checked.setOnClickListener(this);
        view.setTag(holder);
        return view;
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        Log.d(TAG, "bindView");
        RowData data = new RowData();
        data.id = cursor.getInt(cursor.getColumnIndex(Groceries.COLUMN_ID));
        data.amount = cursor.getString(cursor.getColumnIndex(Groceries.COLUMN_AMOUNT));
        data.unit = String.valueOf(cursor.getInt(cursor.getColumnIndex(Groceries.COLUMN_UNIT_ID)));
        data.item = cursor.getString(cursor.getColumnIndex(Groceries.COLUMN_ITEM));
        data.position = cursor.getPosition();

        ViewHolder holder = (ViewHolder) view.getTag();
        holder.amount.setText(data.amount);
        holder.unit.setText(data.unit);
        holder.item.setText(data.item);
        holder.checked.setChecked(mCheckedState.get(data.position));
        holder.checked.setTag(data);
    }

    @Override
    public void onClick(View view) {
        boolean visibility = ((CheckBox) view).isChecked();
        RowData data = (RowData) view.getTag();
        Log.d(TAG, "data: " + data.position);
        mCheckedState.set(data.position, visibility);
        mHelper.setChecked(data.id, visibility == true ? 1 : 0);
    }

    private static class ViewHolder {
        TextView amount;
        TextView unit;
        TextView item;
        CheckBox checked;
    }

    private static class RowData {
        int id;
        String amount;
        String unit;
        String item;
        int position;
    }
}

Copy and paste

for(mCheckedState = new ArrayList<Boolean>(); !cursor.isAfterLast(); cursor.moveToNext()) {
    mCheckedState.add(cursor.getInt(cursor.getColumnIndex(Groceries.COLUMN_CHECKED)) != 0);
}

into a public helper method in your adapter class (i.e. public void populateAdapter()).

Then, in onLoadFinished swap the cursor in (with mAdapter.swapCursor(cursor)) and then call mAdapter.populateAdapter(). This will ensure that your Cursor is bound to the adapter before you attempt to populate mCheckedState.

That said, I'm not entirely sure what you are trying to do with mCheckedState in the first place... why can't you just check/uncheck the views directly using the Cursor in bindView?