I saw a lot of applications developed by ionic 2 that support status bar color with same color of header but I couldn't did that in my application
This image shows my status bar when I built it as apk and installed on my android phone
But I want to do such as this (if possible)
You can refer to this documentation: https://ionicframework.com/docs/native/status-bar/
To change color you can try on your app.component.ts, inside your constructor there:
(Assuming you have injected statusBar: StatusBar
on your ctor)
this.statusBar.backgroundColorByHexString('#ffffff');
Not sure on how to decrease a bit of it's opacity like the example you have shown. Perhaps:
this.statusBar.styleBlackOpaque()
//or
this.statusBar.styleBlackTranslucent()
Let us know what worked for you.