Android. It's okay to init objects outside of onCreate() lifecycle method?

Issue

I have some utils and workers in my project. All of these classes works as singleton. Suppose that I have multimple activities where this objects used but is there a difference between

private LocationWorker mLocationWorker;
...
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_daily_forecast);
    mLocationWorker = LocationWorker.getInstance();

and this?

LocationWorker mLocationWorker = LocationWorker.getInstance()

It's okay to get references to this objects before onCreate() method?

Solution

It's okay to get references to this objects before onCreate() method?

Yes it is.

LocationWorker mLocationWorker = LocationWorker.getInstance();

should work fine.

However, since it is a singleton, I'm not sure there's much point saving a reference to it in a field. You could just do

LocationWorker.getInstance()

whenever you need it.

Answered By - Paul Boddington