Exit/Finish an app/activity - android

Question

I\'ve got 4 activities say Act1, Act2, Act3 and Act4. A button in Act1 opens Act2, a button in Act2 opens Act3, a button in A

Answer 1

Do a 


try
{
finalize();
finish
}
catch(Exception error)
{
error.printStackTrace();
}
//This would exit your App neatly