第二步：简单二维码加logo
接下来给二维码加logo:（看图）
/**
* 根据指定内容生成自定义宽高的二维码图片
*
* param logoBm
* logo图标
* param content
* 需要生成二维码的内容
* param width
* 二维码宽度
* param height
* 二维码高度
* throws WriterException
* 生成二维码异常
*/
public static Bitmap makeQRImage(Bitmap logoBmp, String content,
int QR_WIDTH, int QR_HEIGHT) throws WriterException {
try {
// 图像数据转换，使用了矩阵转换
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 容错率
hints.put(EncodeHintType.MARGIN, 2); // default is 4
hints.put(EncodeHintType.MAX_SIZE, 350);
hints.put(EncodeHintType.MIN_SIZE, 100);
BitMatrix bitMatrix = new QRCodeWriter().encode(content,
BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
for (int y = 0; y < QR_HEIGHT; y++) {
// 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 x = 0; x < QR_WIDTH; x++) {
if (bitMatrix.get(x, y))
pixels[y * QR_WIDTH + x] = 0xff000000;
else
pixels[y * QR_WIDTH + x] = 0xffffffff;
}
}
// ------------------添加图片部分------------------//
Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
Bitmap.Config.ARGB_8888);
// 设置像素点
bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
// 获取图片宽高
int logoWidth = logoBmp.getWidth();
int logoHeight = logoBmp.getHeight();
if (QR_WIDTH == 0 || QR_HEIGHT == 0) {
return null;
}
if (logoWidth == 0 || logoHeight == 0) {
return bitmap;
}
// 图片绘制在二维码中央，合成二维码图片
// logo大小为二维码整体大小的1/2
float scaleFactor = QR_WIDTH * 1.0f / 2 / logoWidth;
try {
Canvas canvas = new Canvas(bitmap);
canvas.drawBitmap(bitmap, 0, 0, null);
canvas.scale(scaleFactor, scaleFactor, QR_WIDTH / 2,
QR_HEIGHT / 2);
canvas.drawBitmap(logoBmp, (QR_WIDTH - logoWidth) / 2,
(QR_HEIGHT - logoHeight) /2, null);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
return bitmap;
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
} catch (WriterException e) {
e.printStackTrace();
}
return null;
}
