如何使用ZXing与安卓相机X解码条形码和QR码

Question

如何集成ZXing库以便将其与新的Android JetpackCameraX一起使用？

我知道我必须建立一个ImageAnalyzer，在里面我必须使用ZXing来解码QR 码和条形码

Answer 1

下面是我为此建立的ImageAnalyzer：

class ZxingQrCodeAnalyzer(
private val onQrCodesDetected: (qrCode: Result) -> Unit
) : ImageAnalysis.Analyzer {
companion object {
val reader = MultiFormatReader()
}
/*
https://developer.android.com/training/camerax/configuration
Default resolution: The default target resolution setting is 640x480.
Adjusting both target resolution and corresponding aspect ratio will result
in a best-supported resolution under 1080p (max analysis resolution).
*/
override fun analyze(imageProxy: ImageProxy, rotationDegrees: Int) {
// okay - manage rotation, not needed for QRCode decoding [-;
// okay - manage it for barcode scanning instead!!!
try {
imageProxy.image?.let {
// ImageProxy uses an ImageReader under the hood:
// https://developer.android.com/reference/androidx/camera/core/ImageProxy.html
// That has a default format of YUV_420_888 if not changed.
// https://developer.android.com/reference/android/graphics/ImageFormat.html#YUV_420_888
// https://developer.android.com/reference/android/media/ImageReader.html
if ((it.format == ImageFormat.YUV_420_888
|| it.format == ImageFormat.YUV_422_888
|| it.format == ImageFormat.YUV_444_888)
&& it.planes.size == 3) {
val buffer = it.planes[0].buffer // We get the luminance plane only, since we
// want to binarize it and we don't wanna take color into consideration.
val bytes = ByteArray(buffer.capacity())
buffer.get(bytes)
// Create a LuminanceSource.
val rotatedImage = RotatedImage(bytes, imageProxy.width, imageProxy.height)
rotateImageArray(rotatedImage, rotationDegrees)
val source = PlanarYUVLuminanceSource(rotatedImage.byteArray,
rotatedImage.width,
rotatedImage.height,
0,
0,
rotatedImage.width,
rotatedImage.height,
false)
// Create a Binarizer
val binarizer = HybridBinarizer(source)
// Create a BinaryBitmap.
val binaryBitmap = BinaryBitmap(binarizer)
// Try decoding...
val result: Result
try {
result = reader.decode(binaryBitmap)
onQrCodesDetected(result)
} catch (e: NotFoundException) {
e.printStackTrace()
}
} else {
// Manage other image formats
// TODO - https://developer.android.com/reference/android/media/Image.html
}
}
} catch (ise: IllegalStateException) {
ise.printStackTrace()
}
}
// 90, 180. 270 rotation
private fun rotateImageArray(imageToRotate: RotatedImage, rotationDegrees: Int) {
if (rotationDegrees == 0) return // no rotation
if (rotationDegrees % 90 != 0) return // only 90 degree times rotations
val width = imageToRotate.width
val height = imageToRotate.height
val rotatedData = ByteArray(imageToRotate.byteArray.size)
for (y in 0 until height) { // we scan the array by rows
for (x in 0 until width) {
when (rotationDegrees) {
90 -> rotatedData[x * height + height - y - 1] =
imageToRotate.byteArray[x + y * width] // Fill from top-right toward left (CW)
180 -> rotatedData[width * (height - y - 1) + width - x - 1] =
imageToRotate.byteArray[x + y * width] // Fill from bottom-right toward up (CW)
270 -> rotatedData[y + x * height] =
imageToRotate.byteArray[y * width + width - x - 1] // The opposite (CCW) of 90 degrees
}
}
}
imageToRotate.byteArray = rotatedData
if (rotationDegrees != 180) {
imageToRotate.height = width
imageToRotate.width = height
}
}
}
private data class RotatedImage(var byteArray: ByteArray, var width: Int, var height: Int)