What Android event is only called once until the activity is destroyed?

Question

I'm looking for a single answer (but I might be asking the wrong question)

Question- does any event only get called once TOTAL until an activity is destroyed?

I ask because when my user rotates the phone to landscape oncreate and onstart are both invoked causing a reload of sorts.

I'm looking for an event that I could put behavior into that would only get run 1x (until the activity is killed)

Thank you in advance

Answer 1

If it is specific to the Activity just check your savedInstanceState parameter in the onCreate event. If it is null, run your code, if not, your code has already been run.

Example:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    if(savedInstanceState == null) {
        // Run your code
    }        
}

savedInstanceState will always be null when onCreate is run for the first time, and it will be populated thereafter.

Answer 2

You don't really specify what you're trying to do with it, so I can't guarantee this is appropriate for your use, but Application.onCreate is only called once.