Android status bar is still light

app.component.ts

import {Component} from "@angular/core";
import {isIOS} from "tns-core-modules/platform";
import {topmost} from "tns-core-modules/ui/frame";
import * as app from 'application';

declare var android;

@Component({
    selector: "ns-app",
    templateUrl: "app.component.html",
})
export class AppComponent {

    constructor() {
        if (isIOS) {
            topmost().ios.controller.navigationBar.barStyle = 1;
        } else {
            let decorView = app.android.startActivity.getWindow().getDecorView();
            decorView.setSystemUiVisibility(android.view.View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
        }
    }
}