Android 二维码相关(一)

Android 二维码相关(一)

本篇文章主要记录下android下使用zxing来创建二维码.

1: 导入依赖

api "com.google.zxing:core:3.5.1"

2: 创建二维码

1. 创建QRCodeWriter对象

   QRCodeWriter qrCodeWriter = new QRCodeWriter();	
   

2. 将文本内容转换成BitMatrix

   BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, size, size);
   

3. 创建bitmap

   Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565);
   

4. 将BitMatrix渲染到bitmap

   for (int x = 0; x < size; x++) {for (int y = 0; y < size; y++) {//将BitMatrix渲染到bitmapbitmap.setPixel(x, y, encode.get(x, y) ? Color.BLACK : Color.WHITE);}
   }
   

完整的代码如下:

public class QRCodeUtils {private static final String TAG = "QRCodeUtils";/*** @param content 字符串内容* @param size    位图宽&高(单位:px)* @return*/public static Bitmap createQRCodeBitmap(String content, int size) {if (TextUtils.isEmpty(content)) return null;if (size <= 0) return null;//创建QRCodeWriter对象QRCodeWriter qrCodeWriter = new QRCodeWriter();try {//使用QRCodeWriter将文本内容转换成BitMatrix.BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, size, size);Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565);for (int x = 0; x < size; x++) {for (int y = 0; y < size; y++) {//将BitMatrix渲染到bitmapbitmap.setPixel(x, y, encode.get(x, y) ? Color.BLACK : Color.WHITE);}}return bitmap;} catch (Throwable e) {Log.e(TAG, "createQRCodeBitmap: ", e);}return null;}
}

3: 给二维码添加logo

给二维码添加logo 与上篇文章添加水印类似.

都是通过canvas重新绘制,合成图片.

具体的代码如下:

  /*** @param srcBitmap   二维码* @param logoBitmap  二维码logo* @param logoPercent 二维码logo的占比 [0,1]* @return*/public static Bitmap addQRCodeLogo(Bitmap srcBitmap, Bitmap logoBitmap, float logoPercent) {//校验参数合法if (srcBitmap == null) return null;if (logoBitmap == null) return srcBitmap;if (logoPercent < 0 || logoPercent > 1) logoPercent = 0.2f;//原图/logo的宽高int srcWidth = srcBitmap.getWidth();int srcHeight = srcBitmap.getHeight();int logoHeight = logoBitmap.getHeight();int logoWidth = logoBitmap.getWidth();//缩放float scaleWidth = srcWidth * logoPercent / logoWidth;float scaleHeight = srcHeight * logoPercent / logoHeight;//使用Canvas绘制Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.RGB_565);Canvas canvas = new Canvas(bitmap);canvas.drawBitmap(srcBitmap, 0, 0, null);canvas.scale(scaleWidth, scaleHeight, srcWidth / 2, srcHeight / 2);canvas.drawBitmap(logoBitmap, srcWidth / 2-logoWidth/2, srcHeight / 2-logoHeight/2, null);return bitmap;}

新增创建二维码方法:

/*** @param content 字符串内容* @param size    位图宽&高(单位:px)* @param logo    二维码logo* @param logoPercent 二维码logo的占比 [0,1]* @return*/
public static Bitmap createQRCodeBitmap(String content, int size, Bitmap logo, float logoPercent) {Bitmap qrCodeBitmap = createQRCodeBitmap(content, size);Bitmap bitmap = addQRCodeLogo(qrCodeBitmap, logo, logoPercent);return bitmap;
}