java.lang.NullPointerException at android.support.v7.widget.RecyclerView.onMeasure

Question

I try to use RecyclerView with RecyclerView.Adapter but here is something wrong. I post my code below:

Layout:

Answer 1

You have to set LayoutManager for RecycleView:

Currently, android supports 3 kinds of layouts.

If you want it seems a normal ListView, use LinearLayoutManager.

If you want it seems a gridView, use GridLayoutManager.

If you want it seem staggered, use StaggeredGridLayoutManager

Constructors for 3 kinds layouts above

LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());

GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);

StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.HORIZONTAL);

Then you set LinearLayout to RecycleView ( in this case I used LinearLayoutManager

recyclerView = (RecyclerView) view.findViewById(R.id.saved_recycle_view);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
recyclerView.setLayoutManager(linearLayoutManager);

Anyway, use OttoBus Library to pass out events from the Adapter to Activity/Fragment containing the RecycleView. Good luck !