Drop down menu android non-spinner

Question

I am trying to make a drop down menu as below programmatically and don't want to use any spinner or xml:

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Answer 1

尝试使用ExpandableListView满足您的要求

Answer 2

There is a ton of libraries out there for this purpose. Simply search for "Expandable Recycler View" and you will get what you need.

Here is my favorite : http://bignerdranch.github.io/expandable-recycler-view/