Is this the correct way to start an Activity?

Intent nnn = new Intent(Hello.this, NewActivity.class);
startActivity(nnn);
finish();

This would start a ne开发者_开发知识库w activity, and then close the current Activity forever, right?

yes. finish should stop the activity. The onDestroy() happens when its called.

http://developer.android.com/reference/android/app/Activity.html#finish%28%29

Yes,Calling finish() should stop your current activity and start new activity.