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picture isn't saved properly into the database (as BLOB)
public boolean SQL_INSERT_PICTURE(PictureDatatype type) {
    try{
        this.db = openHelper.getWritableDatabase();
        Log.d(TAG, "Insert picture");
        System.out.println("insert picture");
        db.execSQL("DELETE FROM picture " +
                "where " + LinkPic + " = '" + type.getLink() + "'");
        db.execSQL("INSERT OR REPLACE INTO picture " +
                "( " + NamePic + ", " + LinkPic + ", " + PicturePic + ") " +
                "VALUES ('" + type.getName() + "', '" + type.getLink() +"', '" +
                type.getPicture() +"')");

        System.out.println("size of the picture (bytearray): " + type.getPicture().length);
        System.out.println("the picture: " + type.getPicture());
        System.out.println("insert complete");
        db.close();
        return true;
    }
        catch(SQLException s){
            System.out.println("Insert failed");
            db.close();
            return false;
        }
}

private byte[] getBitmapAsByteArray(Bitmap bitmap) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        // Middle value is quality, but PNG is lossless, so it's ignored.
        bitmap.compress(CompressFormat.PNG, 0, outputStream);
        return outputStream.toByteArray();
    }

private byte[] getBitmapAsByteArray(Bitmap bitmap) {
        final int width = bitmap.getWidth();
        final int height = bitmap.getHeight();
        ByteBuffer byteBuffer = ByteBuffer.allocate(width * height * 4);

        bitmap.copyPixelsToBuffer(byteBuffer);
        return byteBuffer.array();
    }

public Bitmap loadIcon(long iconId) {
       // Prepare the cursor to read from database....
       byte[] bitmapData = cursor.getBlob(cursor.getColumnIndex(Columns.Icons.DATA));

       return BitmapFactory.decodeByteArray(bitmapData, 0, bitmapData.length);
   }