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bitmap
    bitmap.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bitmap
 bitmap.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;
}

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