RecyclerView only show one element
There is not listview in more modern Android SDK. The replacement of this is RecyclerView, that is more flexible, you can set the layout manager, such as LinearLayoutManager or GridLayoutManager, even you can build your own. But that is more powerful, then that is harder to use. The first program I built, I found it only shows the first element. Then I found in the layout resource file of list adapter, the root element cannot set the height to be "match_parent", if you set "match_parent", the first element will be occupied the whole list, then no room for another elements. So the solution is to the height to be the fixed value or "wrap_content.
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