无法将图像字节数组插入 SQLite Android

Question

我正在尝试从图库中获取图像并首先从 URI 将其转换为位图，然后将其转换为字节数组，然后尝试将其存储到 BLOB 数据类型列的数据库中。插入查询返回成功消息但不反映到数据库中。但是当我将空字节数组传递给它时，它会存储整行。

Bitmap 到 byte[] 的代码：

byte[] imgByteArray;

        int size = bitmap.getRowBytes() * bitmap.getHeight();
        ByteBuffer byteBuffer = ByteBuffer.allocate(size);
        bitmap.copyPixelsToBuffer(byteBuffer);
        imgByteArray = byteBuffer.array();

更新：

从图库和字节转换中获取图像并存储到数据库中的代码：

Intent intent = new Intent();
                intent.setType("image/*");
                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, false);
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent,"Select Picture"), PICK_PICTURE);


public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {

            

            if (requestCode == PICK_PICTURE) {
                if (data.getData() != null) {
                    Uri uri = data.getData();

                    try {
                        pictureBitmap = getBitmapFromUri(uri);

            byte[] imgByteArray;

                int size = pictureBitmap.getRowBytes() * pictureBitmap.getHeight();
                ByteBuffer byteBuffer = ByteBuffer.allocate(size);
                pictureBitmap.copyPixelsToBuffer(byteBuffer);
                imgByteArray = byteBuffer.array();

            


                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
    }
   }
}

    public boolean insertPicture(byte[] picture, String desc){

        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues cValues = new ContentValues();

        cValues.put(KEY_PICTURE, picture);
        cValues.put(KEY_DESC, desc);
        
        long rowId = db.insert(PICTURE_TABLE,null, cValues);
        Log.d("TAG","Row ID : "+rowId);

        db.close();
        if(rowId!=0){
            return true;
        }else {
            return false;
        }

    }

Answer 1

在 onActivityResult 方法中：

Uri uri = data.getData();
InputStream inStream = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(inStream);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.PNG, 0, outStream);       
byte[] imgBytes = outStream.toByteArray();
SQLiteDatabase db = dbHelper.getWritableDatabase();
String sql = "INSERT INTO YOURTABLENAME (id,image) VALUES(?,?)";
SQLiteStatement statement = db.compileStatement(sql);
statement.clearBindings();
statement.bindString(1, Integer.toString(someId));
statement.bindBlob(2, imgBytes);
statement.executeInsert();
db.close();

我建议您使用 id 存储图像字节以便轻松检索它