Android之二维码的生成
public class BitmapUtil {
/**
* 生成一个二维码图像
*
* @param url
* 传入的字符串,通常是一个URL
* @param QR_WIDTH
* 宽度(像素值px)
* @param QR_HEIGHT
* 高度(像素值px)
* @return bitmap
*/
public static final Bitmap create2DCoderBitmap(String url, int QR_WIDTH,int QR_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");
// 图像数据转换,使用了矩阵转换
BitMatrix bitMatrix = new QRCodeWriter().encode(url,
BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
int[] pixels = new int[QR_WIDTH * QR_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 < QR_HEIGHT; y++) {
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;
}
}
}
// 生成二维码图片的格式,使用ARGB_8888
Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
// 显示到一个ImageView上面
// sweepIV.setImageBitmap(bitmap);
return bitmap;
} catch (WriterException e) {
//Log.i("log", "生成二维码错误" + e.getMessage());
return null;
}
}
private static final int BLACK = 0xff000000;
/**
* 生成一个二维码图像
*@param str
*
* @param widthAndHeight
* 图像的宽高
* @return bitmap
*/
public static Bitmap createQRCode(String str, int widthAndHeight)throws WriterException {
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix matrix = new MultiFormatWriter().encode(str,
BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
int width = matrix.getWidth();
int height = matrix.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (matrix.get(x, y)) {
pixels[y * width + x] = BLACK;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
}