how to create expandable list inside a linear layout

I have in a scrollview defined three main linear layout.

When on click on one of this layout I would like to expand a list with different options. How to do that?

I have something like this:

Currently I have:

Main.java:

linlayout1.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {..../ go to a new inntent}
 }

Main.xml:

Layout1
Layout2
Layout3

When clicking on Layout1 I would like to see:

Layout1
 Option1 
 Option2
 Option3
Layout2
Layout3

Can someone help me with the best solution to this? Thx

Solution

you can use this tutorial for your specification. Here is a link, Click Here