如何在ZXing中设置位图的大小？

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.BitmapFactory;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private ImageView qrCodeImageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        qrCodeImageView = findViewById(R.id.qr_code_image_view);

        // 设置二维码的内容
        String content = "https://www.example.com";

        // 设置二维码的大小
        int width = 500;
        int height = 500;

        try {
            // 使用ZXing库生成二维码的矩阵数据
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height);

            // 将矩阵数据转换为位图
            Bitmap bitmap = toBitmap(bitMatrix);

            // 设置位图的大小
            Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);

            // 在ImageView中显示二维码
            qrCodeImageView.setImageBitmap(scaledBitmap);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private Bitmap toBitmap(BitMatrix bitMatrix) {
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                bitmap.setPixel(x, y, bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE);
            }
        }

        return bitmap;
    }
}