[LayaNative 2.0]Native(android)下创建二维码并显示在页面上

Laya2.3.1，Native2.6.1亲测有效.
Android创建二维码用到zxing库 ，在app的依赖项(dependencies)里添加: implementation 'com.google.zxing:core:3.3.0'
 
// ts脚本，点击按钮创建二维码并显示
    private onBtnClickShare() {
        let base64OfQrCode:string = androidplat.createQrCode("https://www.layabox.com/", 180, 180);
        if (base64OfQrCode.length>0) {
            let img:Laya.Image = new Laya.Image();
            img.skin = "data:image/png;base64,"+base64OfQrCode;
            img.pos(100, 300);
            Laya.stage.addChild(img);
        }
    }
 
   // androidplat，创建二维码
    createQrCode(url:string, width:number, height:number):string {
        return this._bridge.call("createQrCode", url, width, height);
    }
 
 
// 以下android代码
// JSBridge.java

public static String createQrCode(final String content, final double width, final double height) {

    Bitmap bitmap = createQRCodeBitmap(content, (int)width, (int)height, "UTF-8", "H", "1", Color.BLACK, Color.WHITE);

    if (null != bitmap) {

        String base64OfBitmap = bitmapToBase64(bitmap);

        if (null != base64OfBitmap) {

            base64OfBitmap.replace("\n", "");

            return base64OfBitmap;

        }

    }

    return "";

}

@Nullable

public static Bitmap createQRCodeBitmap(String content, int width, int height,

                                        @Nullable String character_set, @Nullable String error_correction, @Nullable String margin,

                                        @ColorInt int color_black, @ColorInt int color_white){



    /** 1.参数合法性判断 */

    if(TextUtils.isEmpty(content)){ // 字符串内容判空

        return null;

    }



    if(width < 0 || height < 0){ // 宽和高都需要>=0

        return null;

    }



    try {

        /** 2.设置二维码相关配置,生成BitMatrix(位矩阵)对象 */

        Hashtable<EncodeHintType, String> hints = new Hashtable<>();



        if(!TextUtils.isEmpty(character_set)) {

            hints.put(EncodeHintType.CHARACTER_SET, character_set); // 字符转码格式设置

        }



        if(!TextUtils.isEmpty(error_correction)){

            hints.put(EncodeHintType.ERROR_CORRECTION, error_correction); // 容错级别设置

        }



        if(!TextUtils.isEmpty(margin)){

            hints.put(EncodeHintType.MARGIN, margin); // 空白边距设置

        }

        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);



        /** 3.创建像素数组,并根据BitMatrix(位矩阵)对象为数组元素赋颜色值 */

        int pixels = new int[width * height];

        for(int y = 0; y < height; y++){

            for(int x = 0; x < width; x++){

                if(bitMatrix.get(x, y)){

                    pixels[y * width + x] = color_black; // 黑色色块像素设置

                } else {

                    pixels[y * width + x] = color_white; // 白色色块像素设置

                }

            }

        }



        /** 4.创建Bitmap对象,根据像素数组设置Bitmap每个像素点的颜色值,之后返回Bitmap对象 */

        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;

}

/**

 * bitmap转为base64

 * @param bitmap

 * @return

 */

public static String bitmapToBase64(Bitmap bitmap) {

    String result = null;

    ByteArrayOutputStream baos = null;

    try {

        if (bitmap != null) {

            baos = new ByteArrayOutputStream();

            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);



            baos.flush();

            baos.close();



            byte bitmapBytes = baos.toByteArray();

            result = Base64.encodeToString(bitmapBytes, Base64.DEFAULT);

        }

    } catch (IOException e) {

        e.printStackTrace();

    } finally {

        try {

            if (baos != null) {

                baos.flush();

                baos.close();

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    return result;

}