Ionic $cordovaBarcodeScanner orientation not changing to landscape

I am developing an ionic application (Android) using phonegap-plugin-barcodescanner plugin version 4.0.1. In my controller when I click Scan button the barcode scanner should open in landscape mode only. Below is my ionic info and controller code snippet.

Cordova CLI: 6.4.0
Ionic Framework Version: 1.3.2
Ionic CLI Version: 2.1.4
Ionic App Lib Version: 2.1.2
OS: Windows 8.1
Node Version: v6.4.0

.controller('scanCtrl', function ($scope, $rootScope, $cordovaBarcodeScanner) {
    $rootScope.$on('$locationChangeSuccess', function (event, newUrl, oldUrl) {
        $cordovaBarcodeScanner.scan().then(function (imageData) { 
            console.log("Barcode Format -> " + imageData.format);
            console.log("Cancelled -> " + imageData.cancelled);
        }, function (error) {
            console.log("An error happened -> " + error);

When I put comments for the code block $cordovaBarcodeScanner.scan() the screen orientation is changing to landscape mode, but when I remove the comments it’s opening in portrait mode not in landscape mode as I expected.

Please help me to open the barcode scanner in landscape mode only.
Even I tried adding android:screenOrientation=“landscape” to the barcode scanner plugin’s config.xml file as well. But no luck. Please help me to solve this issue. Any help would be appreciated. Thanks in advance.