Java Question Which type of Context to use...

This is really not a question but I have always been unsure which context to use. In B4A, we have ba.context and also ba.applicationContext. When you wrap a library, you can often deduce which context to use from the code you are wrapping. But if you want to write your own library from scratch??

This answer on SO from CommonsWare suggests that getApplicationContext() is almost always wrong. I found also this guide (although from 2013) but probably still valid which I found quite useful to get a better understanding although I still haven't grasped everything:

How do you reason when you need to use a context? Do you have a simple rule?

EDIT: I found this reply from Erel which probably summons it up nicely..

I guess 99,9% of my wraps are using BA.Context... 0,1% ist using BA.ApplicationContext
I would always start using BA.Context

DonManfred said:

I guess 99,9% of my wraps are using BA.Context... 0,1% ist using BA.ApplicationContext
I would always start using BA.Context

Click to expand...

Yes, I found an answer by Erel. I edited my first post by adding a link to his answer.
So, it seems, as you say, ba.Context is mostly used when you have UI-elements. How is a toast considered? Is it an UI-element?

moster67 said:

This answer on SO from CommonsWare suggests that getApplicationContext() is almost always wrong.

Click to expand...

Strange. I actually prefer to use it when possible as you cannot leak this context (unlike an Activity context) and it is always available.

You can use BA.applicationContext to show a toast.