Accelerate QR-Encoding with ZXing

问题

I'm currently working with a lot of QR-Codes in an Android project, for which zxing is my preferred library.

To actually display the generated QR-Code a Bitmap is created with the information from the encoding.

QRCodeWriter writer = new QRCodeWriter();
BitMatrix matrix = writer.encode(message, BarcodeFormat.QR_CODE, px, px);

Bitmap bitmap = Bitmap.createBitmap(px, px, Bitmap.Config.RGB_565);
for (int x = 0; x < px; x++) {
    for (int y = 0; y < px; y++) {
        bitmap.setPixel(x, y, matrix.get(x,y) ? Color.BLACK : Color.WHITE);
    }
}

This works just fine, however it's terribly slow. Even for rather small Bitmaps it takes several seconds for the entire process.

Is there a way to intelligently speed up this procedure (e.g. parallelisation) or even a better library?

Thanks in advance.

回答1:

I have had the same problem in this sense, I managed to accelerate my qr code loading significantly by following this guy:

https://www.youtube.com/watch?v=-vWHbCr_OWM

Hope this will help anyone who struggles with this and comes across this thread.

Actually perhaps i can save you the trouble:

in gradle:

compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
compile 'com.google.zxing:core:3.2.1'

In code:

        String myStringToEncode = "Something";
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        BitMatrix bitMatrix = multiFormatWriter.encode(myStringToEncode, BarcodeFormat.QR_CODE,200,200);
        BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
        Bitmap bitmpap = barcodeEncoder.createBitmap(bitMatrix);

And then finally I call my ImageView control by its variable

       imgQR.setImageBitmap(bitmpap);

来源：https://stackoverflow.com/questions/39352172/accelerate-qr-encoding-with-zxing

标签

java

android

bitmap

qr-code

zxing