Question

这是我的自定义简单游标适配器：

public MySimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, 
        int[] to, int flags) {
    super(context, layout, c, from, to, 0);
    this.mContext = context;
    mInflater = LayoutInflater.from(context);
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    View view = mInflater.inflate(R.layout.row, parent, false);

    return view;
}

@Override
public void bindView(View view, Context context, Cursor c) {

    TextView rowView = (TextView) view.findViewById(R.id.row);
    ImageView rowImg = (ImageView) view.findViewById(R.id.img);

    String img = null;
    String row = null;

    if (c != null) {
        img = c.getString(c.getColumnIndex(Db.TABLE_IMG));
        row = c.getString(c.getColumnIndex(Db.TABLE_TITLE));
    }

    if (img != null) rowImg.setImageResource(R.drawable.smiley);
    else img.setImageResource(0);

    rowView.setText(row);

}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String[] from = new String[] { ... };
    int[] to = new int[] { ... };
            ... 
    getLoaderManager().initLoader(0, null, this);

    mAdapter = new MySimpleCursorAdapter(this, R.layout.row, null, from,
            to, 0);
    setListAdapter(mAdapter);


public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    String[] projection = { Db.TABLE_ID,
            Db.TABLE_TITLE };

    CursorLoader c = new CursorLoader(this,
            MyProvider.CONTENT_URI, projection, null, null, null);
    return c;
}

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

public void onLoaderReset(Loader<Cursor> loader) {
    mAdapter.swapCursor(null);
}

填充ListView时出错：

java.lang.IllegalStateException：无法从CursorWindow读取第0行col -1。在从中访问数据之前，请确保Cursor已正确初始化。

Answer 1

您的投影{Db.TABLE_ID，Db.TABLE_TITLE}与您尝试检索Db.TABLE_IMG和Db.TABLE_TITLE的值不同。由于在尝试通过适配器访问Db.TABLE_IMG时没有查询它，因此它不存在（这会引发错误）。更改您的预测以包含Db.TABLE_IMG，该错误应该消失

Android重写newView（）和bindView（）问题

1 个答案: