ZxingUtils

ZxingUtils

import android.graphics.Bitmap import android.graphics.Canvas import com.google.zxing.BarcodeFormat import com.google.zxing.EncodeHintType import com.google.zxing.WriterException import com.google.zxing.common.BitMatrix import com.google.zxing.qrcode.QRCodeWriter import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel import java.util.* object ZxingUtils { /** * 生成二维码Bitmap * * @param content 内容 * @param widthPix 图片宽度 * @param heightPix 图片高度 * @param logoBm 二维码中心的Logo图标（可以为null） * @return 生成二维码及保存文件是否成功 */ fun createQRImage(content: String, widthPix: Int = 200, heightPix: Int = 200, logoBm: Bitmap? = null): Bitmap? { try { //配置参数 val hints: MutableMap<EncodeHintType, Any?> = HashMap() hints[EncodeHintType.CHARACTER_SET] = "utf-8" //容错级别 hints[EncodeHintType.ERROR_CORRECTION] = ErrorCorrectionLevel.H //设置空白边距的宽度 hints[EncodeHintType.MARGIN] = 1 //default is 4 // 图像数据转换，使用了矩阵转换 var bitMatrix: BitMatrix? = null try { bitMatrix = QRCodeWriter().encode( content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints ) } catch (e: WriterException) { e.printStackTrace() } val pixels = IntArray(widthPix * heightPix) // 下面这里按照二维码的算法，逐个生成二维码的图片， // 两个for循环是图片横列扫描的结果 for (y in 0 until heightPix) { for (x in 0 until widthPix) { if (bitMatrix!![x, y]) { pixels[y * widthPix + x] = -0x1000000 } else { pixels[y * widthPix + x] = -0x1 } } } // 生成二维码图片的格式，使用ARGB_8888 var bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888) bitmap!!.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix) if (logoBm != null) { bitmap = addLogo(bitmap, logoBm) } //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的， // 内存消耗巨大！ return bitmap // return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100); } catch (e: Exception) { e.printStackTrace() } return null } /** * 在二维码中间添加Logo图案 */ private fun addLogo(src: Bitmap?, logo: Bitmap?): Bitmap? { if (src == null) { return null } if (logo == null) { return src } //获取图片的宽高 val srcWidth = src.width val srcHeight = src.height val logoWidth = logo.width val logoHeight = logo.height if (srcWidth == 0 || srcHeight == 0) { return null } if (logoWidth == 0 || logoHeight == 0) { return src } //logo大小为二维码整体大小的1/5 val scaleFactor = srcWidth * 1.0f / 5 / logoWidth var bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888) try { val canvas = Canvas(bitmap!!) canvas.drawBitmap(src, 0f, 0f, null) canvas.scale(scaleFactor, scaleFactor, srcWidth / 2.toFloat(), srcHeight / 2.toFloat()) canvas.drawBitmap( logo, (srcWidth - logoWidth) / 2.toFloat(), (srcHeight - logoHeight) / 2.toFloat(), null ) canvas.save() canvas.restore() } catch (e: Exception) { bitmap = null e.stackTrace } return bitmap } }