二维码的使用

来源：互联网发布：阿里云重装系统在哪里编辑：程序博客网时间：2024/06/06 01:33

老规矩一开始需要倒入zxing包一个二维码jar包大家可以上网下载

然后开始这是一个简单的画写二维码的小类倒入即可

import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import android.graphics.Bitmap;

public class QrUtils {
private static final int BLACK = 0xff000000;

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;
}
}

然后就是将生成的二维码画上设置到控件上的额时候==============================================（将他放入oncreate）

try {
bitmap = QrUtils
.createQRCode(
"八维欢迎你",
100);
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
image.setImageBitmap(bitmap);

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