Did you know, that you can set RecyclerView layoutManager directly in XML, instead of always set RecyclerView layoutManager in the code?

Examples

Paste one of this attribute in your RecyclerView in XML.

For GridLayoutManager:
app:layoutManager="android.support.v7.widget.GridLayoutManager"

For LinearLayoutManager:
app:layoutManager="android.support.v7.widget.LinearLayoutManager"

And for StaggeredGridLayoutManager:
app:layoutManager="android.support.v7.widget.StaggeredGridLayoutManager"