// 这是我的条码制作器的一段函数
public static Bitmap addCenterImage(Bitmap SrcBmp, Bitmap bitmap) {
 
	int width = SrcBmp.getWidth() / 5;
 
	int offsetX = (SrcBmp.getWidth() - bitmap.getWidth()) / 2;
	int offsetY = (SrcBmp.getHeight() - bitmap.getHeight()) / 2;
 
	int bmpW = bitmap.getWidth();
	int bmpH = bitmap.getHeight();
 
	Canvas ca = new Canvas(bitmap);
	Path path = new Path();
 
	for (int i = 0; i < bmpW; i++)
		for (int j = 0; j < bmpH; j++) 			// 这点不透明而且左右上下四点至少有一点是透明的，那这点就是边缘 			if (bitmap.getPixel(i, j) != Color.TRANSPARENT 					&& (i > 0 && bitmap.getPixel(i - 1, j) == Color.TRANSPARENT
					|| i < bmpW - 1 && bitmap.getPixel(i + 1, j) == Color.TRANSPARENT 					|| j > 0 && bitmap.getPixel(i, j - 1) == Color.TRANSPARENT
					|| j < bmpH - 1 && bitmap.getPixel(i, j + 1) == Color.TRANSPARENT))
				path.addRect(i - 1, j - 1, i, j, Path.Direction.CCW); // 搜集边缘
	Paint paint = new Paint();
	paint.setAntiAlias(true);
	paint.setColor(Color.WHITE);
	paint.setStyle(Paint.Style.FILL_AND_STROKE);
	paint.setStrokeWidth(4.0f);
 
	ca.drawPath(path, paint); // 画出边缘
	Canvas canvas = new Canvas(SrcBmp);
 
	canvas.drawBitmap(bitmap, offsetX, offsetY, null);
 
	return SrcBmp;
}