zxing android qrcode生成器

Question

我包括了我的堆栈跟踪图像

MultiFormatWriter multiFormatWriter = new 
                                       MultiFormatWriter();
    try {
        BitMatrix bitMatrix = multiFormatWriter.encode(uid, 
BarcodeFormat.QR_CODE,200,200);----55
        BarcodeEncoder barcodeEncoder = new BarcodeEncoder();
        Bitmap bitmap = barcodeEncoder.createBitmap(bitMatrix);
        imageView.setImageBitmap(Bitmap.createBitmap(bitmap));



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

目前在55处出现空指针异常错误。我使用了zxing库，但无法执行所需的操作，请帮助我

Answer 1

尝试

public static Bitmap encodeStringToBitmap(String contents) throws WriterException {
//Null check, just b/c
if (contents == null) {
    return null;
}
Map<EncodeHintType, Object> hints = new EnumMap<>(EncodeHintType.class);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result = writer.encode(contents, BarcodeFormat.PDF_417, 700, 900, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
    int offset = y * width;
    for (int x = 0; x < width; x++) {
        pixels[offset + x] = result.get(x, y) ? 0xFF000000 : 0xFFFFFFFF;
    }
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}

更多试用

访问Java Code Examples for com.google.zxing.MultiFormatWriter