I've one seen on an application for iPhone an interesting idea which consists of showing a list of options when we click on an area for text edition. For example, imagine I have a field called "City" (EditText) which I am suposed to enter the name of the city. When clicking on the EditText, a list automatically shows up with a few city suggestions (e.g. defined by the programmer) which can be selected. If the user doesn't like the suggestions, he writes the city himself and this city can be saved for this list for future.
I want to programme this on my App for android. I need that, when clicking on the EditText for introducing the data, a list automatically shows up with some suggestions defined by me (Programmer). However, I don't know how this can be done. I've googled but maybe it's hard to find the correct keywords to find a similar topic.
The idea is that the user should use the names already written in the list in 90% of the time and just write himself the new ones when it's necessary. Something like a dropdown list but with possibility of writing new stuff instantly without specific option.
How can this be achieved?