Android - Auto Complete not showing when using AutoCompleteTextView

Question

I have an EditText in my app. This properly shows the Auto Complete bar at the top of the Google Keyboard when typing as seen below:

I also have an AutoCompleteTextView. This doesn't have an AutoComplete function at all on the keyboard as shown below:

How come AutoCompleteTextViews do not use AutoComplete by default while EditTexts do? Also, how can I turn this feature on in my AutoCompleteTextView?

Thanks in advance!