Creating a layout withint the need to create an XML file

SomeActivity

override fun onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState)
    // creating LinearLayout
    val linLayout: LinearLayout = LinearLayout(this)
    // specifying vertical orientation
    linLayout.setOrientation(LinearLayout.VERTICAL)
    // creating LayoutParams  
    val linLayoutParam: LayoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
    // set LinearLayout as a root element of the screen 
    setContentView(linLayout, linLayoutParam);
}