So what i used in my test project was, launch any sample app in inspector and then minimise the app and click on refresh snapshot.
You will see a camera icon on the andorid phone, via inspector find the element on home screen on the phone and use xpath or any other type to click it.
I used this.
driver.findElement(By.xpath("//android.widget.TextView[@content-desc=‘Camera’]")).click();
Hope this helps.
