Android:使用Zxing生成的二维码有边距(不适合该区域)
Android: Generated QR code using Zxing has margins (is not fit to the area)
我在我的应用程序中使用 ZXing 库来生成二维码。我想生成适合屏幕宽度的 QR 码(可能是一些小填充)。
如果我将屏幕的宽度设置为二维码的宽度尺寸,我会得到更小的二维码。查看屏幕截图(分辨率为 320x240)。我想要二维码适合黑色区域。为什么红色的二维码这么小?
如何拉伸到黑色区域?
我的代码:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
Bitmap bm = encodeAsBitmap(mGeneratedURL, BarcodeFormat.QR_CODE, width, width);
qrcodeImage.setImageBitmap(bm);
生成二维码:
private Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException {
String contentsToEncode = contents;
if (contentsToEncode == null) {
return null;
}
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contentsToEncode);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
//hints.put(EncodeHintType.CHARACTER_SET, encoding);
hints.put(EncodeHintType.MARGIN, 0); /* default = 4 */
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result;
try {
result = writer.encode(contentsToEncode, format, img_width, img_height, hints);
} catch (IllegalArgumentException iae) {
// Unsupported format
return null;
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? RED : Color.BLACK;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
我发现了一个问题!
这一行:
String encoding = guessAppropriateEncoding(contentsToEncode);
returns 空
所以它没有设置
EncodeHintType.MARGIN.
去掉编码应该就可以了
//if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
//hints.put(EncodeHintType.CHARACTER_SET, encoding);
hints.put(EncodeHintType.MARGIN, 0); /* default = 4 */
//}
我在我的应用程序中使用 ZXing 库来生成二维码。我想生成适合屏幕宽度的 QR 码(可能是一些小填充)。
如果我将屏幕的宽度设置为二维码的宽度尺寸,我会得到更小的二维码。查看屏幕截图(分辨率为 320x240)。我想要二维码适合黑色区域。为什么红色的二维码这么小?
如何拉伸到黑色区域?
我的代码:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
Bitmap bm = encodeAsBitmap(mGeneratedURL, BarcodeFormat.QR_CODE, width, width);
qrcodeImage.setImageBitmap(bm);
生成二维码:
private Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException {
String contentsToEncode = contents;
if (contentsToEncode == null) {
return null;
}
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contentsToEncode);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
//hints.put(EncodeHintType.CHARACTER_SET, encoding);
hints.put(EncodeHintType.MARGIN, 0); /* default = 4 */
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result;
try {
result = writer.encode(contentsToEncode, format, img_width, img_height, hints);
} catch (IllegalArgumentException iae) {
// Unsupported format
return null;
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? RED : Color.BLACK;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
我发现了一个问题!
这一行:
String encoding = guessAppropriateEncoding(contentsToEncode);
returns 空
所以它没有设置
EncodeHintType.MARGIN.
去掉编码应该就可以了
//if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
//hints.put(EncodeHintType.CHARACTER_SET, encoding);
hints.put(EncodeHintType.MARGIN, 0); /* default = 4 */
//}