set focus on any item of listview in android

I have a listview which contains textviews as its elements.

1. Now i want the first item of the list to be automatically focused when i launch the application
2. How can i set the focus on any item of the list when i click on the some other view for example a button?

From stackoverflow

• ListView has a setSelected method that takes the index of the item in the list.

  sarvesh : Hi but selected listitem is same as focused listitem?