Zxing core3.5.2自编码条码解码失败，抛出NotFoundException求助

自行编码生成的二维码可被其他扫码APP识别，但通过BitMatrix与Bitmap转换为BinaryBitmap进行解码时，始终返回空结果，抛出如下异常：

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:558) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)  Caused by: com.google.zxing.NotFoundException

相关代码 #

编码器代码 #

class BarcodeWriter: Writer {

    override fun encode(
        contents: String?,
        format: BarcodeFormat?,
        width: Int,
        height: Int
    ): BitMatrix {
        return MultiFormatWriter().encode(contents, format, width, height)

    }

    override fun encode(
        contents: String?,
        format: BarcodeFormat?,
        width: Int,
        height: Int,
        hints: MutableMap<EncodeHintType, *>?
    ): BitMatrix {
        return MultiFormatWriter().encode(contents, format, width, height, hints)
    }

}

解码器代码 #

class BarcodeReader : Reader {
    override fun decode(image: BinaryBitmap?): Result {
        return MultiFormatReader().decode(image)
    }

    override fun decode(image: BinaryBitmap?, hints: MutableMap<DecodeHintType, *>?): Result {
        return MultiFormatReader().decode(image, hints)
    }

    override fun reset() {
        //
    }
}

转换工具代码 #

fun bitMatrixToBmp(bitMatrix: BitMatrix, xColor: Int?, yColor: Int?): Bitmap {
    val height: Int = bitMatrix.height
    val width: Int = bitMatrix.width
    val bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565)
    for (x in 0 until width) {
        for (y in 0 until height) {
            bmp.setPixel(x, y, if (bitMatrix.get(x, y)) xColor?:Color.BLACK else yColor?:Color.WHITE)
        }
    }
    return bmp
}

fun bmpToBinaryBitmap(bitmap: Bitmap) : BinaryBitmap {
    val intArray = IntArray(bitmap.width * bitmap.height)
    val source = RGBLuminanceSource(bitmap.width, bitmap.height, intArray)
    return BinaryBitmap(HybridBinarizer(source))
}

fun bitMatrixToBinary(bitMatrix: BitMatrix): BinaryBitmap {
    val intArray = IntArray(bitMatrix.width * bitMatrix.height)
    val source = RGBLuminanceSource(bitMatrix.width, bitMatrix.height, intArray)
    return BinaryBitmap(HybridBinarizer(source))

}

条码编码调用代码 #

val hints = hashMapOf(
    EncodeHintType.CHARACTER_SET to "utf-8"
)

BarcodeWriter().encode(
    contents = "URL:${urlFormModel.url}",
    format = BarcodeFormat.QR_CODE,
    width = 100,
    height = 100,
    hints = hints
)

条码解码调用代码 #

val decodeHints = hashMapOf(
    DecodeHintType.CHARACTER_SET to "utf-8",
    //DecodeHintType.PURE_BARCODE to true,
    //DecodeHintType.TRY_HARDER to true
)

val result = BarcodeReader().decode(testBarcode.bitMatrix!!.toBinaryMap(), decodeHints)

问题核心在于转换工具的代码存在数据填充遗漏，导致生成的BinaryBitmap不包含有效条码数据，同时解码调用存在方法名错误：

1. 修正转换工具代码 #

修复bmpToBinaryBitmap方法 #

该方法创建了intArray但未从Bitmap中读取像素数据，需补充像素读取逻辑：

fun bmpToBinaryBitmap(bitmap: Bitmap) : BinaryBitmap {
    val intArray = IntArray(bitmap.width * bitmap.height)
    // 从Bitmap中读取像素数据到数组
    bitmap.getPixels(intArray, 0, bitmap.width, 0, 0, bitmap.width, bitmap.height)
    val source = RGBLuminanceSource(bitmap.width, bitmap.height, intArray)
    return BinaryBitmap(HybridBinarizer(source))
}

修复bitMatrixToBinary方法 #

该方法的intArray未填充BitMatrix的黑白像素数据，需遍历BitMatrix填充数组：

fun bitMatrixToBinary(bitMatrix: BitMatrix): BinaryBitmap {
    val width = bitMatrix.width
    val height = bitMatrix.height
    val intArray = IntArray(width * height)
    
    // 填充BitMatrix的黑白像素数据
    for (y in 0 until height) {
        val offset = y * width
        for (x in 0 until width) {
            intArray[offset + x] = if (bitMatrix.get(x, y)) Color.BLACK else Color.WHITE
        }
    }
    
    val source = RGBLuminanceSource(width, height, intArray)
    return BinaryBitmap(HybridBinarizer(source))
}

2. 修正解码调用的方法名错误 #

解码调用中的toBinaryMap应为bitMatrixToBinary，同时优化解码参数提升识别率：

val decodeHints = hashMapOf(
    DecodeHintType.CHARACTER_SET to "utf-8",
    DecodeHintType.PURE_BARCODE to true, // 启用纯条码模式，跳过背景检测
    DecodeHintType.TRY_HARDER to true,  // 启用更复杂的识别逻辑
    DecodeHintType.POSSIBLE_FORMATS to listOf(BarcodeFormat.QR_CODE) // 指定仅识别QR_CODE，缩小扫描范围
)

val result = BarcodeReader().decode(bitMatrixToBinary(testBarcode.bitMatrix!!), decodeHints)

3. 编码器优化（可选） #

可以添加边距参数，避免条码边缘被截断，提升兼容性：

val hints = hashMapOf(
    EncodeHintType.CHARACTER_SET to "utf-8",
    EncodeHintType.MARGIN to 1 // 设置边距为1，符合QR码规范
)

BarcodeWriter().encode(
    contents = "URL:${urlFormModel.url}",
    format = BarcodeFormat.QR_CODE,
    width = 100,
    height = 100,
    hints = hints
)

内容的提问来源于stack exchange，提问作者Crebain