android｜生成二维码qrcode（android）

1.build.gradle

    implementation 'com.google.zxing:core:3.4.1'

引入zxing库 只是生成的话引入core库就可以了

2.封装方法

import android.graphics.Bitmap;
import android.graphics.Color;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.util.HashMap;
import java.util.Map;


public class QRcodeUtil {

    private static volatile QRcodeUtil mInstance;
    private QRcodeUtil(){

    }
    public static QRcodeUtil getInstance() {
        if (mInstance == null) {
            synchronized (QRcodeUtil.class) {
                if (mInstance == null) {
                    mInstance = new QRcodeUtil();
                }
            }
        }
        return mInstance;
    }

    public  Bitmap generateQRCode(String content, int width, int height) {
        QRCodeWriter writer = new QRCodeWriter();
        try {
            // 设置容错率
            Map<EncodeHintType, Object> hints = new HashMap<>();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            // 设置字符集
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            // 生成二维码的位矩阵
            BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            // 将位矩阵转换为像素数组
            int[] pixels = new int[width * height];
            for (int y = 0; y < height; y++) {
                for (int x = 0; x < width; x++) {
                    pixels[y * width + x] = bitMatrix.get(x, y)? Color.BLACK : Color.WHITE;
                }
            }
            // 创建Bitmap并设置像素
            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            return bitmap;
        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        }
    }



}