Add multiple custom views to layout programmatically

If I for example have empty layout like this:

layout1.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

</LinearLayout>

And some other Layout like this:

layout2.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView 1" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 2" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 3" 
        android:layout_weight="1"/>

</LinearLayout>

I would like to add layout2.xml to layout1.xml programmatically. I would need to have multiple different version layout2.xml which I would add when I want. Each one would have different text on TextView and Buttons.

In case of regular Android View I would usually do it similarly like this with addView:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    TextView tv1 = new TextView(this);
    tv1.setText("HELLO");
    my_linear_layout.addView(tv1);

    Button btn2 = new Button(this);
    bt2.setText("WORLD");
    my_linear_layout.addView(btn2);
}

How can I do it if I don't have something simple like TextView or Button, and if I have my own xml defined View?

Would it be possible to somehow put all the views inside adapter like for a ListView and then get it when needed and just call addView on those Views?