Android 生成二维码工具类

 

/** * 生成条形码和二维码的工具 */ public class ZXingUtils { /** * 生成二维码 要转换的地址或字符串,可以是中文 * * @param url * @param width * @param height * @return */ public static Bitmap createQRImage(String url, final int width, final int height) { try { // 判断URL合法性 if (url == null || "".equals(url) || url.length() < 1) { return null; } Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); //容错率 //L 7,M 15,Q 25,H 30. hints.put(EncodeHintType.ERROR_CORRECTION, "H"); //边距 0最小 1 2最大 hints.put(EncodeHintType.MARGIN, "1"); // 图像数据转换，使用了矩阵转换 BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints); int[] pixels = new int[width * height]; // 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 (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { if (bitMatrix.get(x, y)) { pixels[y * width + x] = 0xff000000; } else { pixels[y * width + x] = 0xffffffff; } } } // 生成二维码图片的格式，使用ARGB_8888 Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); return bitmap; } catch (WriterException e) { e.printStackTrace(); } return null; } /** * 用于向创建的二维码中添加一个logo * @param bm_QR * @param bm_logo * @return */ public static Bitmap addLogo(Bitmap bm_QR, Bitmap bm_logo) { if (bm_QR == null) { return null; } if (bm_logo == null) { return bm_QR ; } //获取图片的宽高 int bm_QR_Width = bm_QR.getWidth() ; int bm_QR_Height = bm_QR.getHeight(); int bm_logo_Width = bm_logo.getWidth() ; int bm_logo_Height = bm_logo.getHeight(); //设置log0的大小为二维码整体大小的1/4 float scale_logo = bm_QR_Width*1.0f /4/bm_logo_Width ; Bitmap bitmap = Bitmap.createBitmap(bm_QR_Width, bm_QR_Height, Bitmap.Config.ARGB_8888); try { Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(bm_QR, 0, 0, null); canvas.scale(scale_logo, scale_logo, bm_QR_Width / 2, bm_QR_Height / 2); canvas.drawBitmap(bm_logo, (bm_QR_Width - bm_logo_Width) / 2, (bm_QR_Height - bm_logo_Height) / 2, null); canvas.save(); canvas.restore(); } catch (Exception e) { bitmap = null; e.getStackTrace(); } return bitmap; } /** * 生成条形码 * * @param context * @param contents * 需要生成的内容 * @param desiredWidth * 生成条形码的宽带 * @param desiredHeight * 生成条形码的高度 * @param displayCode * 是否在条形码下方显示内容 * @return */ public static Bitmap creatBarcode(Context context, String contents, int desiredWidth, int desiredHeight, boolean displayCode) { Bitmap ruseltBitmap = null; /** * 图片两端所保留的空白的宽度 */ int marginW = 20; /** * 条形码的编码类型 */ BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128; if (displayCode) { Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight); Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2 * marginW, desiredHeight, context); ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF( 0, desiredHeight)); } else { ruseltBitmap = encodeAsBitmap(contents, barcodeFormat, desiredWidth, desiredHeight); } return ruseltBitmap; } /** * 生成条形码的Bitmap * * @param contents * 需要生成的内容 * @param format * 编码格式 * @param desiredWidth * @param desiredHeight * @return * @throws WriterException */ protected static Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int desiredWidth, int desiredHeight) { final int WHITE = 0xFFFFFFFF; final int BLACK = 0xFF000000; MultiFormatWriter writer = new MultiFormatWriter(); BitMatrix result = null; try { result = writer.encode(contents, format, desiredWidth, desiredHeight, null); } catch (WriterException e) { // TODO Auto-generated catch block e.printStackTrace(); } int width = result.getWidth(); int height = result.getHeight(); int[] pixels = new int[width * height]; // All are 0, or black, by default 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) ? BLACK : WHITE; } } Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); return bitmap; } /** * 生成显示编码的Bitmap * * @param contents * @param width * @param height * @param context * @return */ protected static Bitmap creatCodeBitmap(String contents, int width, int height, Context context) { TextView tv = new TextView(context); ActionBar.LayoutParams layoutParams = new ActionBar.LayoutParams( ActionBar.LayoutParams.MATCH_PARENT, ActionBar.LayoutParams.WRAP_CONTENT); tv.setLayoutParams(layoutParams); tv.setText(contents); tv.setHeight(height); tv.setGravity(Gravity.CENTER_HORIZONTAL); tv.setWidth(width); tv.setDrawingCacheEnabled(true); tv.setTextColor(Color.BLACK); tv.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight()); tv.buildDrawingCache(); Bitmap bitmapCode = tv.getDrawingCache(); return bitmapCode; } /** * 将两个Bitmap合并成一个 * * @param first * @param second * @param fromPoint * 第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap） * @return */ protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second, PointF fromPoint) { if (first == null || second == null || fromPoint == null) { return null; } int marginW = 20; Bitmap newBitmap = Bitmap.createBitmap( first.getWidth() + second.getWidth() + marginW, first.getHeight() + second.getHeight(), Bitmap.Config.ARGB_4444); Canvas cv = new Canvas(newBitmap); cv.drawBitmap(first, marginW, 0, null); cv.drawBitmap(second, fromPoint.x, fromPoint.y, null); cv.save(); cv.restore(); return newBitmap; } }