Android Question Interact with another activity through code

I have an Activity1 and an Activity2. From Activity 1 through the code I have to add a component in Listview1 of the Activity2.
I had thought about it
Dim Layout2 as Activity
Layout2.ListView1.AddTwoLinesAndBitmap ("Item #" & i, "This is the second line.", Bitmap1)
But it gives me error. What is the solution?