How to change an application icon programmatically in Android?

Question

Is it possible to change an application icon directly from the program?
I mean, change icon.png in the res\\drawable folder.
I would like t

Answer 1

To get the solution by Markus working I needed the first Intent so be:

Intent myLauncherIntent = new Intent(Intent.ACTION_MAIN);
            myLauncherIntent.setClassName(this,  this.getClass().getName());
            myLauncherIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);