java - 为什么我的光标返回一些不正确的信息？

Question

我正在制作一个应用程序，他们将一些信息输入到 SQLite 数据库中，然后使用 ListView 进行显示。

虽然似乎有一点错误，但我找不到它。

示例:当他们输入第一个项目的信息时，他们选择不拍照，该项目在 ListView 中正确显示。它不会有图片展示，这是完美的。但如果他们添加另一个项目，并且这次他们选择拍照，则第二个项目的图像也会显示列表中的第一个项目。

而且， ListView 中的图像是数据库中的缩略图列。

---

我有几张图片可以帮助展示这一点:

数据库信息是什么样的:

这就是它在应用程序中的样子。第一项不应显示缩略图，而是显示第二项的缩略图:

我想不通。我的代码看起来是正确的，并且该光标的所有其他信息都是正确的，但为什么只有缩略图不正确？

这是我的 CursorAdapter 中 ListView 使用的相关代码:

 //This turns the thumbnail's bytearray into a bitmap
    byte[] bitmap = cursor.getBlob(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_THUMBNAIL));
    if (bitmap==null){
        Log.d(TAG, "No image was taken for wine: " + wineName);
    }else {
        Bitmap image = BitmapFactory.decodeByteArray(bitmap, 0, bitmap.length);
        wineThumbnail.setImageBitmap(image);
    }

有人猜到这里会发生什么吗？

---

编辑:添加整个 CursorAdapter 代码:

public class WineCursorAdapter extends CursorAdapter {

private String TAG = "WineCursorAdapter";

public WineCursorAdapter(Context context, Cursor c) {
    super(context, c);
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    return LayoutInflater.from(context).inflate(R.layout.list_item, parent, false);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    //Populate the views
    TextView textViewName = (TextView) view.findViewById(wineName);
    TextView textViewPrice = (TextView) view.findViewById(R.id.winePrice);
    RatingBar ratingWine = view.findViewById(R.id.wineRating);
    ImageView wineThumbnail = view.findViewById(R.id.listImage);

    //get the info from cursor
    String wineName = cursor.getString(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_NAME));
    String winePrice = cursor.getString(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_PRICE));
    float wineRating = cursor.getFloat(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_RATING));

    //This turns the thumbnail's bytearray into a bitmap
    byte[] bitmap = cursor.getBlob(cursor.getColumnIndexOrThrow(WineContract.WineEntry.COLUMN_WINE_THUMBNAIL));
    if (bitmap==null){
        Log.d(TAG, "No image was taken for wine: " + wineName);
    }else {
        Bitmap image = BitmapFactory.decodeByteArray(bitmap, 0, bitmap.length);
        wineThumbnail.setImageBitmap(image);
    }

    textViewName.setText(wineName);
    DecimalFormat format = new DecimalFormat("####.##");
    String formatted = format.format(Float.parseFloat(winePrice));
    textViewPrice.setText("$" + formatted);
    ratingWine.setRating(wineRating);

}

Answer 1

您应该将 CursorAdapter 更改为:

if (bitmap==null){
        Log.d(TAG, "No image was taken for wine: " + wineName);
    }else {
        Bitmap image = BitmapFactory.decodeByteArray(bitmap, 0, bitmap.length);
        wineThumbnail.setImageBitmap(image);
    }

到:

if (bitmap==null){
        Log.d(TAG, "No image was taken for wine: " + wineName);
        wineThumbnail.setImageBitmap(null);
    }else {
        Bitmap image = BitmapFactory.decodeByteArray(bitmap, 0, bitmap.length);
        wineThumbnail.setImageBitmap(image);
    }