依赖
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| implementation("com.google.zxing:core:3.4.1")
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调用示例
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| import android.graphics.Bitmap;
import android.graphics.Color;
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 java.util.Map;
public class Test {
public Bitmap createBitmap(String contents, int width, int height)throws WriterException {
BitMatrix matrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height);
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] = matrix.get(x, y) ? Color.BLACK : Color.WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
}
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上面这样创建的是默认样式的二维码，白色边框会比较大，这是个小问题。
更多的自定义参数在 Map<EncodeHintType,?> hints 这个参数设置，看以下示例：
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| ...
Map<EncodeHintType,Object> hints = new HashMap<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//容错率最高
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");// 字符编码 UTF-8
hints.put(EncodeHintType.MARGIN, 0);//白边大小
BitMatrix matrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);
...
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这样设置的就是一个没有白边的二维码