raex_app/scripts/android/fixQRScanner.js

const fs = require("fs");
const path = require("path");
const https = require("https");
module.exports = function (context) {
    if (
        context.opts.plugin &&
        context.opts.plugin.id === "cordova-plugin-qrscanner"
    ) {
        const projectRoot = context.opts.projectRoot;

        const cordovaCommon = context.requireCordovaModule("cordova-common");
        const { ConfigParser } = cordovaCommon;
        const appConfig = new ConfigParser(
            path.resolve(projectRoot, "config.xml")
        );

        let projectName = appConfig.name();

        const file = path.resolve(
            projectRoot,
            "platforms",
            "android",
            "app",
            "src",
            "main",
            "java",
            "com",
            "bitpay",
            "cordova",
            "qrscanner",
            "QRScanner.java"
        );
        if (fs.existsSync(file)) {
            fs.writeFileSync(
                file,
                fs
                    .readFileSync(file)
                    .toString()
                    .replaceAll(
                        "android.support.v4.app.ActivityCompat",
                        "androidx.core.app.ActivityCompat"
                    )
            );
        }
    }
};