为什么我的光标返回一些不正确的信息?

时间:2017-10-08 17:33:05

标签: java android sqlite cursor

我正在创建一个应用程序,他们将一些信息输入到SQLite数据库中,然后使用ListView进行显示。

虽然似乎有一点虫子但我找不到它。

示例:当他们输入第一个项目的信息,并且他们选择不拍照时,该项目在ListView中正确显示。它没有图片展示,这是完美的。但是如果他们添加了另一个项目,并且这次他们选择拍照,则第二个项目的图像也将显示在列表中的第一个项目。

此外,listview中的图像是数据库中的缩略图列。

我有几张照片可以帮助证明这一点:

数据库信息是什么样的:

What the database info looks like:

这就是它在应用程序中的样子。第一项不应该有缩略图显示,而是显示第二项的缩略图:

enter image description here

我无法弄清楚这一点。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,但为什么只是缩略图?

以下是ListView使用的CursorAdapter中的相关代码:

 //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);
    }

有没有人对这里发生的事情有任何猜测?

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);

}

}

1 个答案:

答案 0 :(得分:1)

您应该更改CursorAdapter

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);
    }

为:

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);
    }